Refine
Year of publication
Document Type
- Doctoral Thesis (407) (remove)
Language
- English (407) (remove)
Keywords
- Fernerkundung (14)
- Erdbeben (12)
- Klimawandel (12)
- climate change (12)
- remote sensing (12)
- Anden (11)
- Andes (11)
- Tektonik (10)
- Erosion (9)
- Geomorphologie (9)
- Himalaya (9)
- Seismologie (9)
- erosion (9)
- numerische Modellierung (9)
- tectonics (9)
- Argentina (8)
- Argentinien (8)
- Paläoklima (8)
- earthquake (8)
- geomorphology (8)
- thermochronology (8)
- Holozän (7)
- Klima (7)
- Subduktion (7)
- climate (7)
- Geologie (6)
- Geophysik (6)
- Modellierung (6)
- Naturgefahren (6)
- Neotektonik (6)
- Seesedimente (6)
- Thermochronologie (6)
- biomarker (6)
- stable isotopes (6)
- Arktis (5)
- Biomarker (5)
- Bodenfeuchte (5)
- Holocene (5)
- InSAR (5)
- Magnetotellurik (5)
- Monsun (5)
- Paläoklimatologie (5)
- Zeitreihenanalyse (5)
- geology (5)
- geophysics (5)
- kosmogene Nuklide (5)
- lake sediments (5)
- seismology (5)
- soil moisture (5)
- subduction (5)
- Arctic (4)
- Chile (4)
- Deformation (4)
- Geodynamik (4)
- Himalaja (4)
- Hochwasser (4)
- Hydrologie (4)
- Permafrost (4)
- Rheologie (4)
- Spektroskopie (4)
- Tibetan Plateau (4)
- hydrology (4)
- induced seismicity (4)
- machine learning (4)
- monsoon (4)
- neotectonics (4)
- numerical modeling (4)
- palaeoclimate (4)
- permafrost (4)
- seismic noise (4)
- stabile Isotope (4)
- Africa (3)
- Afrika (3)
- Carbonate (3)
- Central Andes (3)
- Central Asia (3)
- Cosmogenic nuclides (3)
- Diffusion (3)
- East African Rift (3)
- East African Rift System (3)
- Erdmantel (3)
- Erdrutsch (3)
- Geochronologie (3)
- Geothermie (3)
- Kosmogene Nuklide (3)
- Lake sediments (3)
- Landschaftsentwicklung (3)
- Nachbeben (3)
- Optische Fernerkundung (3)
- PHREEQC (3)
- Pollen (3)
- Rheology (3)
- Schadensmodellierung (3)
- Sedimentologie (3)
- Seismology (3)
- Simulation (3)
- Standorteffekte (3)
- Strukturgeologie (3)
- Subduktionszone (3)
- Vegetation (3)
- Zentralanden (3)
- Zentralasien (3)
- arctic (3)
- cosmogenic nuclides (3)
- deformation (3)
- floods (3)
- geochemistry (3)
- geochronology (3)
- geodynamics (3)
- hydrologische Modellierung (3)
- isotopes (3)
- landslides (3)
- magnetotellurics (3)
- modeling (3)
- modelling (3)
- natural hazards (3)
- numerical modelling (3)
- numerical simulation (3)
- paleoclimate (3)
- seismic hazard (3)
- simulation (3)
- site effects (3)
- spectroscopy (3)
- subduction zone (3)
- time series analysis (3)
- varved lake sediments (3)
- warvierte Seesedimente (3)
- Abbildende Spektroskopie (2)
- Alpen (2)
- Alps (2)
- Anpassung (2)
- Arava Fault (2)
- Arava-Störung (2)
- Arctic tundra (2)
- Black Sea (2)
- Boden (2)
- Bodenbewegungsmodelle (2)
- Bodenhydrologie (2)
- Climate change (2)
- Colombia (2)
- Dead Sea (2)
- Dead Sea Transform (2)
- Deformationsmechanismen (2)
- Denudation (2)
- Diatomeen (2)
- Dichtemodellierung (2)
- Earth's magnetic field (2)
- Eastern Cordillera (2)
- Erdbebenvorhersage (2)
- Erdmagnetfeld (2)
- Europa (2)
- GIS (2)
- GNSS (2)
- GPS (2)
- Gashydrate (2)
- Geochemie (2)
- Georadar (2)
- Gewässerfernerkundung (2)
- Gletscher (2)
- Hochdruck (2)
- Hyperspektral (2)
- Indien (2)
- Inversion (2)
- Karbonat (2)
- Karbonate (2)
- Klimarekonstruktion (2)
- Kohlenstoff (2)
- Kolumbien (2)
- Küstenerosion (2)
- Lagerstätte (2)
- Landnutzung (2)
- Landnutzungswandel (2)
- Landslide (2)
- Lithosphäre (2)
- Miocene (2)
- Miozän (2)
- Momententensor (2)
- Monsoon (2)
- Oberflächenprozesse (2)
- Opalinus Clay (2)
- Opalinuston (2)
- Orogen (2)
- Ostafrikanisches Grabensystem (2)
- Paleoclimatology (2)
- Paleoseismologie (2)
- Paläogeographie (2)
- Paläolimnologie (2)
- Paläomagnetik (2)
- Paläoökologie (2)
- Pamir (2)
- Perm (2)
- Permian (2)
- Photogrammetrie (2)
- Photogrammetry (2)
- Pirquitas (2)
- Plateau (2)
- Puna (2)
- Quartär (2)
- Reflexionsseismik (2)
- Remote sensing (2)
- SAR (2)
- Sanierung (2)
- Schwarzes Meer (2)
- Sedimentology (2)
- Sedimenttransport (2)
- Seen (2)
- Seesediment (2)
- Seismotektonik (2)
- Seitenverschiebung (2)
- Siberia (2)
- South America (2)
- Stratigraphy (2)
- Subduction (2)
- Südamerika (2)
- Tectonics (2)
- Thermokarst (2)
- Tibet Plateau (2)
- Tien Shan (2)
- Totes Meer Störungssystem (2)
- Tropen (2)
- Tsunami (2)
- Unsicherheiten (2)
- Unsicherheitsanalyse (2)
- Verwerfungen (2)
- Vorhersage (2)
- Vorlandbecken (2)
- Vulkan (2)
- Vulnerabilität (2)
- Warven (2)
- Wasser (2)
- Wetterlagen (2)
- Wärmeleitfähigkeit (2)
- arktische Tundra (2)
- carbon (2)
- coastal erosion (2)
- damage modeling (2)
- deep learning (2)
- diffusion (2)
- displacement (2)
- event synchronization (2)
- exhumation (2)
- extension (2)
- extreme events (2)
- faults (2)
- flood risk (2)
- fluid flow (2)
- foreland basin (2)
- geothermal energy (2)
- ground motion modeling (2)
- hydraulic fracturing (2)
- hyperspectral (2)
- hyporheic zone (2)
- hyporheische Zone (2)
- imaging spectroscopy (2)
- inverse theory (2)
- inversion (2)
- komplexes Netzwerk (2)
- lake-level change (2)
- land use change (2)
- landscape evolution (2)
- landslide (2)
- lithosphere (2)
- mantle plumes (2)
- marine Terrassen (2)
- maschinelles Lernen (2)
- methane (2)
- microbial communities (2)
- moment tensor (2)
- monitoring (2)
- numerische Simulation (2)
- paleoclimatology (2)
- paleoecology (2)
- paleomagnetism (2)
- paleoseismology (2)
- plateau (2)
- reactive transport (2)
- reaktiver Transport (2)
- rivers (2)
- seismic risk (2)
- seismic tomography (2)
- seismische Gefährdung (2)
- seismisches Rauschen (2)
- seismisches Risiko (2)
- soil (2)
- soil organic carbon (2)
- strike-slip fault (2)
- structural geology (2)
- surface heat flow (2)
- surface processes (2)
- suspended sediment (2)
- tectonic geomorphology (2)
- tektonische Geomorphologie (2)
- thermal modeling (2)
- thermische Modellierung (2)
- thermokarst (2)
- tropics (2)
- varves (2)
- vegetation (2)
- vulnerability (2)
- water (2)
- wavelet (2)
- (Alters-) Datierungen (1)
- 26Al/10Be cosmogenic radionuclides (1)
- 26Al/10Be kosmogene Radionuklide (1)
- 2D Numerical Modelling (1)
- 2D tomography (1)
- 3-D Modellierung (1)
- 3-D outcrop modeling (1)
- 3D (1)
- 3D Finite Element (1)
- 3D geomechanical numerical model (1)
- 3D geomechanisch-nummerische Modellierung (1)
- 40Ar-39Ar Datierungsmethode (1)
- 40Ar/39Ar (1)
- ASM (1)
- ASPECT (1)
- ASTER Satellitendaten (1)
- ASTER satellite images (1)
- Abbaufrontkartierung (1)
- Abschiebungshorizonte (1)
- Abschätzung der Unsicherheiten (1)
- Adana Basin (1)
- Adana Becken (1)
- African climate (1)
- Afrikanisches Klima (1)
- Akkumulationsraten (1)
- Alaunschiefer (1)
- Alborz (1)
- Alkenone (1)
- AlpArray (1)
- Alpine Fault (1)
- Alterationsgeochemie (1)
- Altersdatierung mit kosmogenen Nukliden (1)
- Altersmodelierung (1)
- Altiplano (1)
- Altlasten (1)
- Alum shale (1)
- Ambient noise (1)
- Amplifier Lakes (1)
- Analogmodell (1)
- Analogue Model (1)
- Analyse komponentenspezifischer Kohlenstoffisotope (1)
- Anatolia (1)
- Anatolien (1)
- Anden / Störung <Geologie> / Strukturgeologie / Magnetotellurik / Chile <Nord> (1)
- Angewandte Geophysik (1)
- Anisotrope Inversion (1)
- Anisotropie (1)
- Anisotropie der Leitfähigkeit (1)
- Antarctica (1)
- Antarktis (1)
- Antibiotikaresistenz (1)
- Antwortspektren (1)
- Apatit-(U-Th)/He Datierung (1)
- Apatit-Spaltspurendatierung (1)
- Apatite (U-Th)/He, apatite fission track dating (1)
- Applied Geophysics (1)
- Ar-Ar geochronology (1)
- Arabian Plate (1)
- Arabische Platte (1)
- Aral Sea (1)
- Aralsee (1)
- Archaeolithoporella (1)
- Archetyp (1)
- Archäomagnetismus (1)
- Arctic nearhore zone (1)
- Argon (1)
- Arktik (1)
- Array-Entwurf (1)
- Asia (1)
- Asian Summer Monsoon (1)
- Asian monsoon (1)
- Asiatischer Sommermonsun (1)
- Asien (1)
- Attribut-Analysen (1)
- Attributanalyse (1)
- Attribute (1)
- Auenbereich (1)
- Aufenthaltsdauer (1)
- Aufschluss-Modellierung (1)
- Auftretensrate (1)
- Australia (1)
- Australien (1)
- BRDF (1)
- Bachstufen (1)
- Baikalsee (1)
- Bakterien (1)
- Baryt (1)
- Basalt-Vulkane (1)
- Bay of Bengal (1)
- Bayes (1)
- Bayes'sche Netze (1)
- Bayesian networks (1)
- Bayesische Statistik (1)
- Beckenentwicklung (1)
- Beckenstruktur (1)
- Beobachtung von Erdbebenquellen (1)
- Bergsturz (1)
- Bergstürze (1)
- Beweidung (1)
- Bildbearbeitung (1)
- Biodiversität (1)
- Biogeochemie (1)
- Biogeochemistry (1)
- Biogeowissenschaften (1)
- Blattverschiebung (1)
- Blattwachse (1)
- Blei (1)
- Blockgletscher (1)
- Bodenbewegung (1)
- Bodenbewegungsmodellierung (1)
- Bodenfeuchtigkeit (1)
- Bodenheterogenität (1)
- Bodenparameter (1)
- Bodenunruhe (1)
- Bodenwasser (1)
- Bohrloch-Rekonstruktion (1)
- Bohrlochmessungen (1)
- Bohrlochrandausbrüche (1)
- Bolivian tin belt (1)
- Bor (1)
- Bor-isotopen (1)
- Borehole reconstruction (1)
- Borisotope; Zentrale Anden; kontinentaler Arc-Vulkanismus; Across-arc Variation; Borisotopenfraktionierung; krustale Kontamination (1)
- Boron isotopes (1)
- Boron isotopes; Central Andes; continental arc volcanism; across-arc variation; boron isotope fractionation; crustal contamination (1)
- Boundary element method (1)
- Braunsbach Sturzflut (1)
- Braunsbach flash flood (1)
- Bruchausbreitung (1)
- Bruchflaechenstruktur (1)
- Bruchmechanik (1)
- Bruchmodel (1)
- Bruchzähigkeit (1)
- Bucht von Bengalen (1)
- Buntsandstein (1)
- CRS (1)
- Caimancito oil field (1)
- Caimancito-Ölfeld (1)
- Calderas (1)
- Campo petrolero Caimancito (1)
- Canada (1)
- Carbo-Iron (1)
- Carbo-Iron® (1)
- Carbonate-Silicate reactions (1)
- Carbonates (1)
- Carrara marble (1)
- Carrara-marmor (1)
- Causal structure (1)
- Cenozoic aridification (1)
- Cenral Andes (1)
- Central Mediterranean (1)
- Cerrado (1)
- Chaco-Paraná Becken (1)
- Chaco-Paraná basin (1)
- Channel Transmission Losses (1)
- Charnockit (1)
- Chilean Andes (1)
- Chirete (1)
- Cimmerian orogeny (1)
- Cinética de fases (1)
- Cinética del querógeno (1)
- Climate (1)
- Climate reconstruction (1)
- Colorado (1)
- Common-Reflection-Surface (1)
- Compound dislocation models (CDMs) (1)
- Computational Fluid Dynamics (CFD) (1)
- Congo Air Boundary (1)
- Contamination Control (1)
- Continental Rifts (1)
- Core-mantle baundary (1)
- Cosmogenic Nuclides (1)
- Coulomb stress (1)
- Coulombspannung (1)
- Coupled heat and mass transport (1)
- Cretaceous (1)
- Cretaceous basin (1)
- Cuenca Cretácica (1)
- Cyclostratigraphy (1)
- Cyprus arc (1)
- D” Schicht (1)
- D” layer (1)
- DANSER (1)
- Dabie Shan (1)
- Data-Mining (1)
- Datenanalyse (1)
- Datenbearbeitung (1)
- Datenfilter (1)
- Dauer der Bodenbewegung (1)
- Dauerfrostboden (1)
- Deep Learning (1)
- Deformationsquellenmodellierung (1)
- Dehnungsdeformation (1)
- Dendroklimatologie (1)
- Denitrifikation (1)
- Density modelling (1)
- Denudationsraten (1)
- Deuterium Exzesses (1)
- Diagenese (1)
- Diagenesis (1)
- Diaguita (1)
- Diamantstempelzelle (1)
- Diamantstempelzellen (1)
- Diatoms (1)
- Dichteheterogenitäten im oberen Mantel (1)
- Digitale Gesteinsphysik (1)
- Dinoflagellatenzyste (1)
- Discrete Element Method (1)
- Diskrete-Elemente-Methode (1)
- Dispersionskurven (1)
- Distally steepened ramps (1)
- Distribution functions with upper bound (1)
- Drohnen-Fernerkundung (1)
- Druck-Temperatur Bedingungen (1)
- Drucklösungsprozesse (1)
- Dryland Rivers (1)
- Dämpfungstomographie (1)
- ENSO (1)
- ETAS (1)
- ETAS Modell (1)
- ETAS model (1)
- EXAFS (1)
- Early Earth (1)
- Earth's mantle (1)
- Earthquake (1)
- Earthquake forecasting (1)
- Earthquake magnitude (1)
- Earthquakes (1)
- East African Plateau (1)
- East Antarctica (1)
- Eastern Karoo Basin (1)
- Eifel Depression (1)
- Eifeler Nord-Süd-Zone (1)
- Einzugsgebiet (1)
- Einzugsgebietshydrologie (1)
- Einzugsgebietsklassifizierung (1)
- Eisdamm (1)
- Eisdynamik (1)
- Eisenbahninfrastruktur (1)
- Eismodell (1)
- Eklogite (1)
- Elastische Gesteinseigenschaften (1)
- Elastizitätsmodul (1)
- Elbe (1)
- Elbe estuary (1)
- Elbe Ästuar (1)
- Elburs (1)
- Electrical Resistivity Tomography (ERT) (1)
- Electrical resistivity tomography (1)
- Elektrische Widerstandstomographie (ERT) (1)
- EnMAP (1)
- EnMAP Satellit (1)
- EnMAP satellite (1)
- Endlagerung nuklearer Abfälle (1)
- Enhanced Geothermal Systems (1)
- Ensemble analysis (1)
- Ensemble-Analyse (1)
- Entwicklungsländer (1)
- Eocene (1)
- Eozän (1)
- Epithermal Ag-Sn deposits (1)
- Erdbeben Modellierung (1)
- Erdbeben-Magnitude (1)
- Erdbebengefährdungsabschätzungen (1)
- Erdbebenkatalogdaten (1)
- Erdbebenquellen-Array (1)
- Erdbebenschwärme (1)
- Erdbebenschäden (1)
- Erdbebenwechselwirkung (1)
- Erdbeeben (1)
- Erdbeobachtung (1)
- Erdfälle (1)
- Erdrutsche (1)
- Ereignissynchronisation (1)
- Erz (1)
- Eulerian grid (1)
- Eulerische Gitter (1)
- Eurasian active margin (1)
- Eurasischer aktiver Kontinentalrand (1)
- Europe (1)
- European Alps (1)
- Europäische Alpen (1)
- Event Koinzidenz Analyse (1)
- Exhumationsprozesse (1)
- Exhumationsraten (1)
- Exhumierung (1)
- Expositionsaltersdatierung (1)
- Expositionsmodellen (1)
- Extension (1)
- Extremereignisse (1)
- Extremniederschläge (1)
- Falten (1)
- FastScape (1)
- Fault Healing (1)
- Fault architecture (1)
- Fault interaction (1)
- Fe-Mg-carpholite (1)
- Fehlerquellen der Modellierung (1)
- Feinsedimente (1)
- Feld (1)
- Feldarbeit (1)
- Feldspat (1)
- Felsmechanik (1)
- Fernerkundung an Vulkanen (1)
- Ferroperiklas (1)
- Festigkeit (1)
- Festigkeit des Schiefer (1)
- Finnmark Platform (1)
- Flache Subduktion (1)
- Flachwassercarbonate (1)
- Flat subduction (1)
- Flood Forecasting (1)
- Flood frequency analysis (1)
- Flood regionalisation (1)
- Fluid (1)
- Fluid inclusions (1)
- Fluid-Gesteins-Wechselwirkung (1)
- Fluid-Gesteinswechselwirkungen (1)
- Fluid-Schmelze Wechselwirkung (1)
- Fluid-strömungen (1)
- Fluide (1)
- Fluidströmung (1)
- Fluoreszenzbildgebung (1)
- Flussbettmorphologie (1)
- Flussprozesse (1)
- Flussterrassen (1)
- Flüsse (1)
- Flüssigkeitseinschlüsse (1)
- Flüssigkeitsinklusionen (1)
- Folgenabschätzung (1)
- Foraminifera (1)
- Fore-Arc (1)
- Foreland (1)
- Foreland basin (1)
- Foreland basins (1)
- Formación Yacoraite (1)
- Formationsschaden (1)
- Forstwirtschaft (1)
- Fotogrammetrie (1)
- Fourier spectra (1)
- Fourier-Spektren (1)
- Fracture mechanics (1)
- Frühdiagenese (1)
- Frühe Erdgeschichte (1)
- GDGT (1)
- GITEWS (1)
- GMPE adjustment (1)
- GST (1)
- Gabbro-Eklogit (1)
- Gasgeochemie (1)
- Gaylussite (1)
- Gebietszustand (1)
- Gebirgsbildung (1)
- Gebirgsbäche (1)
- Gebirgshydrologie (1)
- Gebäudenergiebedarf (1)
- Gefahren (1)
- Gefahrenanalyse (1)
- Gekoppelter Wärme- und Massetransport (1)
- Geochronology (1)
- Geodynamic Modeling (1)
- Geodynamic Modelling (1)
- Geodynamiche Modellierung (1)
- Geodynamics (1)
- Geodynamische Modellierung (1)
- Geology (1)
- Geomagnetic activity (1)
- Geomagnetic index (1)
- Geomagnetic observatory (1)
- Geomagnetische Aktivität (1)
- Geomagnetischer Index (1)
- Geomagnetisches Observatorium (1)
- Geomechanical Modelling (1)
- Geomechanik (1)
- Geomechanische Modellierung (1)
- Geomicrobiology (1)
- Geomikrobiologie (1)
- Geomorphology (1)
- Geophysics (1)
- Georgia (1)
- Georgien (1)
- Geosciences (1)
- Geothermal monitoring (1)
- Geothermisches Monitoring (1)
- Geowissenschaften (1)
- Geoökologie (1)
- Gerinne-Hang-Kopplung (1)
- Gerinnemorphologie (1)
- Germany (1)
- Geschiebetransport (1)
- Gestein-Wasser-Wechselwirkung (1)
- Gesteinsmagnetik (1)
- Glaciers (1)
- Glasstruktur (1)
- Glazialisostasie (1)
- Gletschervorfeld (1)
- Global change (1)
- Global earthquake data (1)
- Global inversion (1)
- Globale Erdbebenkatalogdaten (1)
- Globale Inversion (1)
- Gläser (1)
- Grabenbrüche (1)
- Gravimetrie (1)
- Gravity (1)
- Ground Motion Prediction Equation (GMPE) (1)
- Groundwater (1)
- Grundgestein (1)
- Grundgesteinshöhe (1)
- Grundwasser (1)
- Grundwasserentwicklung (1)
- H/V Verhältnis (1)
- H/V ratio (1)
- HDAC (1)
- HP-HT Experimente (1)
- HP-HT experiments (1)
- HP/LT metamorphism (1)
- HP/LT-Metamorphose (1)
- Halophile (1)
- Hangerosion (1)
- Hanghydrologie (1)
- Hangrutsch (1)
- Hangrutschungen (1)
- Hauptspannungsachse (1)
- Haushalte (1)
- Hawaii (1)
- Hebung (1)
- Hebung des Plateaus (1)
- Hebungsraten (1)
- Helium (1)
- Hercynian orogeny (1)
- Herdmechanismen (1)
- Herdzeit Parameter Abschätzung (1)
- Herschel Island Qikiqtaruk (1)
- Heterogenität (1)
- Heterozoan (1)
- Heterozoikum (1)
- Hidden Markov Model (HMM) (1)
- High-pressure/low-temperature rocks (1)
- Himalaja (Kaghan) (1)
- Himalaya (Kaghan Valley) (1)
- Himalaya-Tibet Orogen (1)
- Himalaya-Tibet orogen (1)
- Hochdruck/Niedrigtemperatur Gesteine (1)
- Hochdurchsatzsequenzierung (1)
- Hochland von Tibet (1)
- Hochplateau (1)
- Hochtemperatur Gesteinsdeformtion (1)
- Hochwasserregionalisierung (1)
- Hochwasserrekonstruktion (1)
- Hochwasserrisiko (1)
- Hochwasserrisikoanalysen (1)
- Hochwasserrisikokette (1)
- Hochwasserstatistik (1)
- Hochwassertypen (1)
- Hochwasservorhersage (1)
- Hohlzylinderversuche (1)
- Home (1)
- Horizontal flux (1)
- Hydratbildung (1)
- Hydrogenase (1)
- Hydrogeophysics (1)
- Hydrogeopyhsik (1)
- Hydrogravimetrie (1)
- Hydrological Modelling (1)
- Hydrological extremes (1)
- Hämmerlein (1)
- Hämolyse (1)
- IHPV (1)
- Ice model (1)
- Iceland (1)
- Imaging spectroscopy (1)
- Impakt (1)
- In-Situ-Analyse (1)
- InSAR Datenanalyse (1)
- InSAR- Techniken (1)
- India (1)
- Indian Monsoon (1)
- Indian Summer Monsoon (1)
- Indian summer monsoon (1)
- Indische Sommer Monsun (1)
- Indischer Sommermonsun (1)
- Indonesia (1)
- Indonesien (1)
- Induzierte Seismizität (1)
- Injektion (1)
- Injektionsschema (1)
- Interaktion zwischen sich ausbreitenden Riftsegmenten (1)
- Interferometrie (1)
- Interseismic strain rates (1)
- Interseismiche Dehnungsraten (1)
- Interzeptionsverdunstung (1)
- Inundation (1)
- Inverse modelling (1)
- Inversions-Theorie (1)
- Inversionstheorie (1)
- Ionosphäre (1)
- Iran (1)
- Island (1)
- Isotope (1)
- Isotopen (1)
- Isotopenfraktionierung (1)
- Isotopes (1)
- Isábena Einzugsgebiet (1)
- Isábena catchment (1)
- Isótopos de Boro (1)
- Kalahari (1)
- Kanada (1)
- Karakoram (1)
- Karakorum (1)
- Karbonat-Silikat-Reaktionen (1)
- Karbonat-Stabilität (1)
- Karbonatplattformen (1)
- Karbonatrampen (1)
- Karbonatschmelze (1)
- Karpholithe (1)
- Karst (1)
- Kausalstruktur (1)
- Kenia (1)
- Kenya (1)
- Kerguelen (1)
- Kern-Mantel Grenze (1)
- Kerogenkinetik (1)
- Klimatologie (1)
- Klimavariabilität (1)
- Klimaveränderung (1)
- Klimaänderung (1)
- Knickpoint (1)
- Knickpoint retreat (1)
- Knickpunkt (1)
- Knickpunkt-Rückzug (1)
- Kohlenstoffdioxid (1)
- Kohlenstoffisotope (1)
- Kohlenstoffkreislauf (1)
- Kohlenstoffspeicher (1)
- Kolloidtransport (1)
- Kongo Luftmassengrenze (1)
- Kontaminationskontrolle (1)
- Kontinentale Kollision (1)
- Kontinentalrand (1)
- Koppelung (1)
- Korallen (1)
- Korrelation (1)
- Krankheitserreger (1)
- Kreide (1)
- Kreidebecken (1)
- Kriecheigenschaften (1)
- Krustenstruktur der Süd-Türkei (1)
- Krustenstruktur des Eratosthenes Seeberges (1)
- Krustenverformungen (1)
- Kugelflächenfunktionen (1)
- Kultivierung (1)
- Kumamoto Erdbeben (1)
- Kumamoto earthquake (1)
- Kupfer (1)
- Känozoische Aridifizierung (1)
- Küste (1)
- Küstenlinien (1)
- LA-ICP-MS (1)
- LGM (1)
- Lake Baikal (1)
- Lake Challa (1)
- Lake Naivasha (1)
- Lake Van (1)
- Land use change (1)
- Landformen (1)
- Landnutzungsänderung (1)
- Landscape Evolution (1)
- Landschaftseffekte (1)
- Landschaftspräferenzen (1)
- Landwirtschaft (1)
- Laser ablation (1)
- Laserheizsystem (1)
- Last Glacial (1)
- Lateglacial (1)
- Lateinamerika (1)
- Latin America (1)
- Lava dome (1)
- Lavadom (1)
- Lavafontänen (1)
- Lawinen (1)
- Lena Delta (1)
- Letztes Glazial (1)
- Lichenometrie (1)
- Liquiñe-Ofqui Störungszone (1)
- Liquiñe-Ofqui fault zone (1)
- Lithium (1)
- Lithospheric Deformation (1)
- Lithospheric strength (1)
- Lithosphärenfestigkeit (1)
- Lithosphärische Deformation (1)
- Llaima Vulkan (1)
- Llaima volcano (1)
- Lokalisierte Deformation (1)
- Lokalisierung von Deformation (1)
- Lokalisierung von Verformung (1)
- Lombok (1)
- Lonar lake (1)
- Lonarsee (1)
- Loppa High (1)
- Lower Devonian (1)
- Luxembourg (1)
- Luxemburg (1)
- Lycian Nappes (1)
- Lykischen Decken (1)
- Lysimeter (1)
- MC-ICP-MS (1)
- Mackenzie Delta (1)
- Mackenzie-Delta (1)
- Magma-Entgasung (1)
- Magmagänge (1)
- Magmatismus (1)
- Magnesit (1)
- Magnetostratigraphie (1)
- Magnetotelluric (1)
- Mahalanobis distance (1)
- Mahalanobis-Distanz (1)
- Malta (1)
- Mantel Plume (1)
- Mantelplumes (1)
- Mantle Plume (1)
- Mantleplumes (1)
- Marmarameer (1)
- Martinez del Tineo (1)
- Massenaussterben (1)
- Massenversatzprozesse (1)
- Mediterranes Tiefdrucksystem (1)
- Meditteranean sea (1)
- Meeressedimente (1)
- Melilitit (1)
- Melt inclusions (1)
- Menderes Massif (1)
- Menderes Massiv (1)
- Merapi (1)
- Mesozoic (1)
- Mesozoikum (1)
- Metamorphism (1)
- Metamorphose (1)
- Metasomatism (1)
- Metasomatose (1)
- Methan (1)
- Methanhydrat (1)
- Mexico (1)
- Mexiko (1)
- Middle East (1)
- Migration (1)
- Mikro-CT (1)
- Mikrobieller Abbau von organischen Material (1)
- Mikroplatte (1)
- Mikrostruktur (1)
- Mikrostrukturelle (1)
- Mikrostrukturen (1)
- Mineralreaktion (1)
- Mineralverwitterungsreaktionen (1)
- Mineralzusammensetzung (1)
- Mittelmeer (1)
- Mittelmeerraum (1)
- Mixmodelle (1)
- Model (1)
- Modell (1)
- Modellanpassung (1)
- Modellierung der Wassertrübung (1)
- Modellierung des seismischen Zyklus (1)
- Molybdän (1)
- Moment tensor inversion (1)
- Momententensoren (1)
- Momententensorinversion (1)
- Mondsee (1)
- Mongolei (1)
- Mongolia (1)
- Morphometrie (1)
- Morphometry (1)
- Multi-Hazard (1)
- Multiproxy-Untersuchung (1)
- Multiskalen Netzwerk (1)
- Multivariate Analyse (1)
- Multivariate statistic (1)
- Muscovit (1)
- Muster der Bodenfeuchte (1)
- Mustererkennung (1)
- NAO (1)
- NW Himalaja (1)
- NW Himalaya (1)
- Naher Osten (1)
- Naivasha See (1)
- Namche Barwa (1)
- Nanoeisen (1)
- Natural Hazards (1)
- Naturrisiken (1)
- Natürliche Staudämme (1)
- Near-surface geophysics (1)
- Neon (1)
- Neotectonics (1)
- Nettorotation der Lithosphäre (1)
- Neutronen (1)
- Nicht-Einmaligkeit (1)
- Niederschlag (1)
- Niedrigwasser (1)
- Niger (1)
- Non-uniqueness (1)
- Nordanatolische Störungszone (1)
- Nordostdeutsches Becken (1)
- North Anatolian Fault Zone (1)
- Northeast German Basin (1)
- Numerische 2D Modellierung (1)
- Nährstoffe (1)
- Nährstoffretention (1)
- ODP Leg 194 (1)
- Oberfläche (1)
- Oberflächenexpositionsdatierung (1)
- Oberflächennahe Geophysik (1)
- Oberflächenwärmefluss (1)
- Oberflächenwärmefluß (1)
- Ocean Colour satellite data (1)
- Oligo-Miocene (1)
- Oligozän-Miozän-Grenze (1)
- OpenStreetMap (1)
- Optical remote sensing (1)
- Optical sensor (1)
- Optische Sensoren (1)
- Organic matter mineralization (1)
- Organofazies (1)
- Ostafrika (1)
- Ostafrikanisches Rift (1)
- Ostafrikanisches Riftsystem (1)
- Ostafrikansches Rift (1)
- Ostantarktis (1)
- Ostkordillere (1)
- PM10, PM2, PM1 (1)
- PPGIS (1)
- Palaeoklima (1)
- Paleoclimate (1)
- Paleoclimate dynamics (1)
- Paleofloods (1)
- Paleogeography (1)
- Paleomagnetism (1)
- Paleomagnetismus (1)
- Paläo-See Mweru (1)
- Paläo-Strain-Berechnung (1)
- Paläoaltimetrie (1)
- Paläohochwasser (1)
- Paläohydrologie (1)
- Paläointensität (1)
- Paläoklimadynamik (1)
- Paläomagnetismus (1)
- Paläosekularvariation (1)
- Paläotektonik (1)
- Paläotopographie (1)
- Pamir-Tien Shan (1)
- Panasqueira (1)
- Paris Basin (1)
- Pariser Becken (1)
- Particle swarm optimization (1)
- Partikelschwarm-Optimierung (1)
- Passiv-seismische Interferometrie (1)
- Passive Kontinentalränder (1)
- Passive margins (1)
- Passive seismic interferometry (1)
- Patagonia (1)
- Pattern Recognition (1)
- Periglazial (1)
- Periglazialgeomorphologie (1)
- Permafrost carbon feedback (1)
- Permafrost-Taustörungen (1)
- Permafrostdegradation (1)
- Permafrostlandschaften (1)
- Permafrostsedimente (1)
- Permeabilität (1)
- Permeabilitätsentwicklung (1)
- Petrologie (1)
- Petrology (1)
- Pflanzen-Habitat Interaktionen (1)
- Pflanzenwachs (1)
- Pflanzenwachstum (1)
- Pflanzenwasserzustand (1)
- Pflaume (1)
- PhaseKinetics (1)
- Phasenkinetik (1)
- Photozoan (1)
- Photozoikum (1)
- Phytoplankton (1)
- Pilze (1)
- Plattenbewegungen (1)
- Playa (1)
- Plume-Rücken Interaktion (1)
- Polarimetrie (1)
- Polarimetry (1)
- Pollenanalyse (1)
- Pollenproduktivitätsschätzungen (1)
- Polynia (1)
- Pontiden (1)
- Pontides (1)
- Porphyrische Kupferlagerstätte (1)
- Posidonia shale (1)
- Posidonienschiefer (1)
- Probabilistic regional envelope curves (1)
- Probabilistische Regionale Hüllkurven (1)
- Probenahmestrategie (1)
- Procrustes rotation analysis (1)
- Prokrustes Analyse (1)
- Prozessidentifikation (1)
- Präzision Gartenbau (1)
- Psychologie (1)
- Quantitative Daten (1)
- Quaternary (1)
- Quell-Array optimales Design (1)
- Quelle Inversion (1)
- Quellenparameter (1)
- Quellenumkehr (1)
- REVEALS (1)
- Radiokarbondatierung (1)
- Raman spectroscopy (1)
- Raman-Spektroskopie (1)
- Ramos X-11 (1)
- Randelementmethode (1)
- Rauheit (1)
- Raumwellen (1)
- Reaktionspfadmodellierung (1)
- Reaktivierung von Störungszonen (1)
- Regensturm (1)
- Regressionsanalyse (1)
- Regularisierung (1)
- Reibung an Plattengrenzen (1)
- Reifegradbezogene Biomarker (1)
- Remote Sensing (1)
- Rhenohercynian Zone (1)
- Rhenohercynische Zone (1)
- Rheological modeling (1)
- Rheologische Modellierung (1)
- Rhizosphere (1)
- Riff (1)
- Rift (1)
- Ringstörungen (1)
- Risikoanalyse (1)
- Risikobewertung von Vulkanausbrüchen (1)
- Risikokommunikation (1)
- Riss (1)
- Rissmechanik (1)
- Risstransmissivität (1)
- Russian Arctic (1)
- Réunion (1)
- Río Pescado (1)
- Röntgenabsorptionsspektroskopie (1)
- Rückenkollision (1)
- SEC (1)
- SIMS (1)
- SWIM (1)
- Salt pan (1)
- Salt transport (1)
- Salta Rift (1)
- Salta basin (1)
- Salta-Becken (1)
- Salzgestein (1)
- Salzpfanne (1)
- Salztransport (1)
- San Andreas Fault (1)
- San Andreas Verwerfung (1)
- Sandstein (1)
- Saprolit (1)
- Sardinia (1)
- Sardinien (1)
- Satelliten-Fernerkundung (1)
- Satellitenbilder (1)
- Satellitenmission Swarm (1)
- Sauerstoff (1)
- Sauerstoffisotope (1)
- Savannen-Ökologie (1)
- Scaling (1)
- Schallemissionen (1)
- Scherzonen (1)
- Schmelzeinschlüsse (1)
- Schmelzstruktur (1)
- Schnee (1)
- Schwarmbeben (1)
- Schwerkraft (1)
- Sea of Marmara (1)
- SeaWiFS Ocean-Colour Satellitendaten (1)
- Sediment Fingerprinting (1)
- Sedimentationsdynamik (1)
- Sedimentbecken (1)
- Sedimente (1)
- Sedimentenabfolge (1)
- Sedimentfalle (1)
- Sedimentfazies (1)
- Sedimentfracht (1)
- Sedimentmächtigkeit (1)
- Sedimentquellenidentifizierung (1)
- Sedimenttransportsystem (1)
- Sedimentvolumen (1)
- Seeausbrüche (1)
- Seedurchmischung (1)
- Seespiegelschwankungen (1)
- Seestandsänderung (1)
- Seesystemreaktionen (1)
- Seismic Array Methods (1)
- Seismic arrays (1)
- Seismik (1)
- Seismische Arrays (1)
- Seismische Geschwindigkeiten (1)
- Seismische Interferometrie (1)
- Seismische Tomographie (1)
- Seismizität und Tektonik (1)
- Seismizitätsmodellierung (1)
- Seltenerdelemente (1)
- Shortening (1)
- Shyok Fluss (1)
- Shyok River (1)
- Sibirien (1)
- Sibirien <Nord> (1)
- Sibirienhoch (1)
- Sierras Pampeanas (1)
- Signalbildung (1)
- Signalweiterleitung (1)
- Silikatschmelze (1)
- Silikatverwitterung (1)
- Sinkholes (1)
- Skala (1)
- Skalierung (1)
- Skarn (1)
- Sn (1)
- Software (1)
- Soil hydrology (1)
- Soil moisture (1)
- Solar irradiation (1)
- Solare Austrahlung (1)
- Sorption (1)
- South Chile (1)
- South Eifel (1)
- Space climate (1)
- Space weather (1)
- Spalt Spuren (1)
- Spalteneruption (1)
- Spannung (1)
- Spannungsfeld (1)
- Spannungsmessung (1)
- Spannungsmuster (1)
- Spannungsänderungen (1)
- Spektralanalyse (1)
- Spiti valley (1)
- Spitsbergen (1)
- Spity Valley (1)
- Spitzbergen (1)
- Spread F (1)
- Spröde Vorläufer (1)
- Spurenelement-Partitionierung (1)
- Spätglazial (1)
- Sri Lanka (1)
- Stabile Isotope (1)
- Stabile Isotopen (1)
- Stabile Sauerstoff- und Kohlenstoffisotope (1)
- Stalagmiten (1)
- Standort des Streuers (1)
- Statistical seismology (1)
- Statistische Seismologie (1)
- Stochastischer Algorithmus (1)
- Strahlung und chemische Eigenschaften (1)
- Strain Localisation (1)
- Strain Localization (1)
- Stratigrafie (1)
- Stratigraphie (1)
- Stream Power Law (1)
- Stressmodellierung (1)
- Strike-Slip Störungen (1)
- Strike-slip fault (1)
- Stromsektor (1)
- Sturzfluten (1)
- Städe (1)
- Städte Effizienz (1)
- Störungen (1)
- Störungsbau (1)
- Störungsinteraktion (1)
- Störungszonenarchitektur (1)
- Subduktionsbeben (1)
- Submarine permafrost (1)
- Submariner Permafrost (1)
- Subsea permafrost (1)
- Subsidenzgeschichte (1)
- Subsurface Biosphere (1)
- Suguta Tal (1)
- Suguta Valley (1)
- Suigetsu (1)
- Sulfatreduktion (1)
- Superconducting gravimetry (1)
- Supraleit-Gravimetrie (1)
- Supraleitender Gravimeter (SG) (1)
- Suspendsionsfracht (1)
- Sweet (1)
- Synchronisation von Ereignissen (1)
- Syntaxe (1)
- Synthetic Aperture Radar (1)
- Synthetische Sandsteine (1)
- Süd Chile (1)
- Süd-Türkei (1)
- Südeifel (1)
- TDR (1)
- Taifune (1)
- Tectona grandis (1)
- Tectonic geomorphology (1)
- Tektonische Geomorphologie (1)
- Temperature reconstruction (1)
- Temperaturerekonstruktion (1)
- Temperaturfeld (1)
- Tendürek Vulkan (1)
- Tendürek volcano (1)
- Thermal (1)
- Thermal modeling (1)
- Thermal-conductivity (1)
- Thermisch (1)
- Thermische Modellierung (1)
- Thermokarstprozesse (1)
- Thermotoleranz (1)
- Tian Shan (1)
- Tian-Shan (1)
- Tibet (1)
- Tiefendeformation (1)
- Tiefenversickerung (1)
- Tiefer See (1)
- Tien-Shan (1)
- Tiltmeter (1)
- Time series analysis (1)
- Tomographie (1)
- Tomographie des elektrischen Widerstands (1)
- Tonmineralien (1)
- Topographie (1)
- Torsion Experiments (1)
- Torsionsexperimente (1)
- Tote Meer (1)
- Totes Meer (1)
- Transferverluste in Flüssen (1)
- Transformation (1)
- Transformation hydrologischer Signale (1)
- Transformstörung (1)
- Treibhausgase (1)
- Trendanalysen (1)
- Triangular dislocations (TDs) (1)
- Trier-Luxembourg Basin (1)
- Trier-Luxembourg Embayment (1)
- Trier-Luxemburger Becken (1)
- Trier-Luxemburger Bucht (1)
- Tritium Assay (1)
- Tritium Versuchsanordnung (1)
- Trockenflüsse (1)
- Tsunami-Frühwarnsystem (1)
- Tsunami-Risiko (1)
- Turbidite (1)
- Turbidites (1)
- Turmalin (1)
- U-Pb Geochronologie (1)
- U-Pb geochronology (1)
- UHI (1)
- UHP (1)
- UV fs laser ablation (1)
- UV-Lasermikrodissektion (1)
- UV-laser microdissection (1)
- Umweltmonitoring (1)
- Umweltrekonstruktion (1)
- Uncertainty Analysis (1)
- Unsupervised Learning (1)
- Unterdevon (1)
- Untergrunduntersuchung der Biosphäre (1)
- Untertage-Kohlevergasung (1)
- Unüberwachtes Lernen (1)
- Uplift Rates (1)
- Uran (1)
- Uran-Blei-Datierung (1)
- Vansee (1)
- Variabilität (1)
- Variabilität von Bodenbewegung (1)
- Vegetationsbedeckung (1)
- Verarbeitung seismischer Daten (1)
- Verdichtung (1)
- Verformungslokalisierung (1)
- Verkürzung (1)
- Verschüttungsaltersdatierung (1)
- Verteilungsfunktionen mit einer oberen Grenze (1)
- Vertical flux (1)
- Vertreibung (1)
- Verwitterungsfeedback (1)
- Videoanalyse (1)
- Virulenz (1)
- Viskositätsstruktur im oberen Mantel (1)
- Vogtland (1)
- Volcano (1)
- Volcano deformation modelling (1)
- Vorelandbecken (1)
- Vorland (1)
- Vorlanddeformation (1)
- Vs Profile (1)
- Vs profiles (1)
- Vulcano (1)
- Vulkan Verformung (1)
- Vulkaniklastika (1)
- Vulkanologie (1)
- Vulkanverformungsmodellierung (1)
- Vulkanüberwachung (1)
- Waldbewirtschaftung (1)
- Warve (1)
- Warves (1)
- Wasser-Gesteins-Wechselwirkungen (1)
- Wasser-Monitoring (1)
- Wasserdampf (1)
- Wassergütemodellierung (1)
- Wasserhaushalt (1)
- Wasserpflanzen (1)
- Wasserqualität (1)
- Wasserspeicheränderungen (1)
- Water resources (1)
- Wavelet (1)
- Weilerbach-Mulde (1)
- Well-log analysis (1)
- Wellenausbreitung (1)
- Wellenbrechung und Diffraktion (1)
- Wellenleiter (1)
- Weltraumklima (1)
- Weltraumwetter (1)
- West Bohemia (1)
- West Fault Zone (1)
- West Turkey (1)
- West Türkei (1)
- Windböen (1)
- Winddynamik (1)
- Winderosion (1)
- Wirtsgesteinsskala (1)
- Wittlicher Senke (1)
- Wofram-Zinn Lagerstätte (1)
- Wuchiapingian (1)
- Wuchiapingium (1)
- X-ray absorption spectroscopy (1)
- XANES (1)
- XAS (1)
- XRF (1)
- Yacoraite Formation (1)
- Yarlung-Tsangpo Gorge (1)
- Yarlung-Tsangpo Schlucht (1)
- Yatta (1)
- Young's modulus (1)
- Zeitanhängig (1)
- Zeitserie (1)
- Zeitskala (1)
- Zentral Asien (1)
- Zink (1)
- Zinn (1)
- Zusammengesetztes Dislokationsmodel (CDM) (1)
- Zustands-Übergangs-Modelle (1)
- Zyklostratigraphie (1)
- Zypernbogen (1)
- accumulation rates (1)
- acoustic emissions (1)
- active layer (1)
- active seismic (1)
- active source data (1)
- adapation (1)
- adaptation (1)
- aftershock (1)
- aftershock sequence (1)
- aftershocks (1)
- age modeling (1)
- age-related biomarkers (1)
- agriculture (1)
- aktive Quelldaten (1)
- aktive Seismik (1)
- aktive Weitewinkel-Seismik (1)
- alkenones (1)
- allochthon (1)
- alluvial channel morphology (1)
- alteration geochemistry (1)
- anaerobe Inkubationensexperimente (1)
- anaerobic incubation experiments (1)
- angewandte Geophysik (1)
- anisotropic inversion (1)
- anisotropy (1)
- antecedent conditions (1)
- antibiotic resistance (1)
- antimicrobial resistance (1)
- applied geophysics (1)
- aquatic ecosystems (1)
- aquatischen Ökosystemen (1)
- archeomagnetism (1)
- archetype (1)
- arctic water bodies (1)
- arktische Gewässer (1)
- arktischer Nahküstenbereich (1)
- array design (1)
- artificial mixtures (1)
- artificial neural networks (1)
- asthenospheric slab-window (1)
- asthenospherisches "slab-window" (1)
- attenuation tomography (1)
- attribute analysis (1)
- attributes (1)
- authigene Mineralbildung (1)
- authigenic mineral formation (1)
- autochthon (1)
- automatic classification (1)
- automatische Klassifizierung (1)
- b-Wert Kartierung (1)
- b-value map (1)
- bacteria (1)
- barite (1)
- basaltic volcanoes (1)
- basement rock (1)
- basin evolution (1)
- basin structure (1)
- bedload transport (1)
- bedrock elevation (1)
- beginnende Kontinent-Kontinent Kollision (1)
- beobachtende Seismologie (1)
- biodegradación (1)
- biodegradation (1)
- biodiversity (1)
- biogeoscience (1)
- biologischer Abbau (1)
- biomarcadores diagnósticos de edad (1)
- biomarcadores diagnósticos de madurez (1)
- body waves (1)
- bolivianischen Zinngürtels (1)
- borehole breakouts (1)
- boron (1)
- bottom water (1)
- brittle deformation (1)
- brittle precursors (1)
- burial dating (1)
- carbon cycling (1)
- carbon density (1)
- carbon dioxide (1)
- carbon isotopes (1)
- carbonate (1)
- carbonate melt (1)
- carbonate platforms (1)
- carbonate ramps (1)
- carbonate stability (1)
- carbonate systems (1)
- carbonates (1)
- carpholite (1)
- catchment (1)
- catchment classification (1)
- catchment hydrology (1)
- catchment state (1)
- central Andes (1)
- central-eastern Beringia (1)
- channel steps (1)
- channel-hillslope coupling (1)
- charnockite (1)
- chemical weathering (1)
- chemische Verwitterung (1)
- chilenische Anden (1)
- circular statistics (1)
- cities (1)
- classification (1)
- clay mineral (1)
- climate dynamics (1)
- climate extreme events (1)
- climate global and local patterns (1)
- climate impacts (1)
- climate reconstruction (1)
- climate variability (1)
- climatic change (1)
- climatolgoy (1)
- closed chamber method (1)
- coast (1)
- coesite (1)
- coherence (1)
- colloid transport (1)
- combinatorial inverse modelling (1)
- complex network (1)
- complex networks (1)
- compound-specific stable carbon isotope analyses (1)
- compression (1)
- computational seismology (1)
- computergestützte Seismologie (1)
- conductivity anisotropy (1)
- continental collision (1)
- continental margins (1)
- controlled source wide angle seismic (1)
- controlo estrutural (1)
- copper (1)
- corals (1)
- correlation (1)
- cosmic rays (1)
- cosmic-ray (1)
- cosmogenic nuclide dating (1)
- cosmogenic radionuclide-based dating (1)
- cosmogenic radionuclides (1)
- counterclockwise block rotation between overlapping rift segments (1)
- coupling (1)
- creep properties (1)
- critical zone (1)
- crop modeling (1)
- crustal deformations (1)
- crustal stress (1)
- crustal structure of south central Turkey (1)
- crustal structure of the Eratosthenes Seamount (1)
- cultivation (1)
- d-excess (1)
- damage modelling (1)
- data analysis (1)
- data filtering (1)
- data processing (1)
- data-mining (1)
- deep carbon (1)
- deep convection (1)
- deep seepage (1)
- deforestation (1)
- deformation mechanisms (1)
- deformation source modeling (1)
- dendroclimatology (1)
- denitrification (1)
- density modeling (1)
- density-driven flow (1)
- denudation (1)
- denudation processes (1)
- denudation rates (1)
- deposits (1)
- depósitos de volfrâmio-estanho (1)
- der Städtische Wärmeinseleffekt (1)
- der Urbane Hitzeinsel Effekt (1)
- der Urbane Hitzeinsel Effekt basierend auf Landoberflächentemperatur (1)
- developing countries (1)
- diagenesis (1)
- diagenetische Prozesse (1)
- diamond anvil cell (1)
- diamond anvil cells (1)
- diatoms (1)
- dichtegetriebene Strömung (1)
- die Stadtform (1)
- digital rock physics (1)
- dike pathways (1)
- dispersion curves (1)
- distal steil ansteigende Rampen (1)
- dreieckige Dislokationen (TDs) (1)
- duration (1)
- dynamic topography (1)
- dynamische Topographie (1)
- décollement (1)
- early diagenesis (1)
- early earth tectonics (1)
- earth mantle (1)
- earth's mantle (1)
- earthquake bulletin data (1)
- earthquake damage (1)
- earthquake forecasting (1)
- earthquake interaction (1)
- earthquake location (1)
- earthquake modeling (1)
- earthquake source array (1)
- earthquake source observations (1)
- earthquake swarm (1)
- earthquake swarms (1)
- earthquakes (1)
- eastern south–central Andes (1)
- eclogite (1)
- eclogite (UHP) (1)
- eco-hydrological modelling (1)
- ecohydrology (1)
- ecological modelling (1)
- economic impacts (1)
- elastic rock properties (1)
- electric and magnetic fields (1)
- electrical conductivity (1)
- electrical resistivity (1)
- elektrische Leitfähigkeit (1)
- elektrische und magnetische Felder (1)
- energy demand (1)
- enhanced geothermal system (1)
- enhanced geothermal systems (EGS) (1)
- environmental monitoring (1)
- environmental reconstruction (1)
- epithermale Zinn-Silber-lagerstätte (1)
- equatorial electrojet (1)
- equatorial plasma depletions (1)
- ererbte Strukturen (1)
- estuary (1)
- event coincidence analysis (1)
- exhumation processes (1)
- exhumation rates (1)
- exposure (1)
- exposure age dating (1)
- extreme Ereignisse (1)
- extreme Klimaereignisse (1)
- extreme hydro-meteorologische Ereignisse (1)
- extreme hydrometeorological events (1)
- extreme rainfall (1)
- fault healing (1)
- fault plane structure (1)
- fault reactivation (1)
- fault zone architecture (1)
- feldspar (1)
- ferropericlase (1)
- fieldwork (1)
- finite Differenzen (1)
- finite Elemente (1)
- finite difference simulation (1)
- finite differences (1)
- finite elements (1)
- fission track (1)
- fissure eruption (1)
- flash floods (1)
- flood (1)
- flood events (1)
- flood reconstruction (1)
- flood risk analysis (1)
- flood types (1)
- flooding (1)
- floodplain inundation (1)
- fluid inclusions (1)
- fluid rock interaction (1)
- fluid-melt interaction (1)
- fluid-rock interactions (1)
- fluorescence imaging (1)
- fluvial fill terraces (1)
- fluvial incision (1)
- fluviale Einschneidung (1)
- fluxo de fluidos (1)
- focal mechanisms (1)
- folds (1)
- foraminifera (1)
- fore-arc (1)
- forecast (1)
- forecasting (1)
- foreland deformation (1)
- forest management (1)
- forestry (1)
- formation damage (1)
- fracture growth (1)
- fracture mechanics (1)
- fracture toughness (1)
- fracture transmissivity (1)
- fracture-controlled (1)
- fungi (1)
- gas geochemistry (1)
- gas hydrates (1)
- geführte Wellen (1)
- gegen den Uhrzeigersinn gerichtete Rotation von Krustenblöcken zwischen zwei überlappenden Riftsegmenten (1)
- generative model (1)
- geodynamic modeling (1)
- geodynamic models (1)
- geodynamische Modelle (1)
- geodynamische Modellierung (1)
- geoecology (1)
- geohazards (1)
- geologic fault (1)
- geologische Verwerfung (1)
- geomagnetic (1)
- geomagnetic excursions (1)
- geomagnetische Exkursionen (1)
- geomechanical modelling (1)
- geomechanics (1)
- geomechanische Modellierung (1)
- geophysical methods (1)
- geophysikalische Methoden (1)
- geoquímica da alteração hidrotermal (1)
- geothermal (1)
- geothermal exploration (1)
- geothermal monitoring (1)
- geothermische Exploration (1)
- geothermische Überwachung (1)
- geothermischer Reservoire (1)
- geschlossene Haubenmessmethode (1)
- gestreute Phasen (1)
- glacial and interglacial permafrost (1)
- glacial incision (1)
- glacial isostatic adjustment (1)
- glacier forefield (1)
- glaciers (1)
- glass structure (1)
- glasses (1)
- glaziale Einschneidung (1)
- global flood model (1)
- global navigation satellite systems (1)
- globale und lokale Muster des Klimas (1)
- globales Navigationssatellitensystem (1)
- globales Positionsbestimmungssystem (1)
- globales Überschwemmungsmodell (1)
- gravimetry (1)
- grazing (1)
- greenhouse gases (1)
- ground motion variability (1)
- ground motions (1)
- ground penetrating radar (1)
- ground-motion models (1)
- ground-penetrating radar (1)
- groundwater evolution (1)
- guided waves (1)
- halophiles (1)
- hazard assessments (1)
- hazards (1)
- hemolysis (1)
- herzynische Orogenese (1)
- heterogeneity (1)
- heterozoan carbonates (1)
- heterozoisch (1)
- high pressure (1)
- high temperature rock deformation (1)
- high-pressure (1)
- high-pressure metasediments (1)
- hillslope diffusion (1)
- hillslope hydrology (1)
- historical earthquakes (1)
- historische Erdbeben (1)
- hochdruckmetamorphe Sedimente (1)
- hollow cylinder experiments (1)
- holocene (1)
- horizontaler Fluss (1)
- host rock scale (1)
- human impact (1)
- hydrate (1)
- hydrate formation (1)
- hydraulic simulation (1)
- hydraulische Risserzeugung (1)
- hydraulisches Aufbrechen (1)
- hydro-meteorological risk (1)
- hydro-meteorologische Risiken (1)
- hydrogravimetry (1)
- hydrological flow paths (1)
- hydrological modelling (1)
- hydrological monitoring and modelling (1)
- hydrologische Fließpfade (1)
- hydrologische Vorbedingungen (1)
- hydrothermal (1)
- hydrothermal systems (1)
- hydrothermale Alteration (1)
- hydrothermale Systeme (1)
- hyperspectral remote sensing (1)
- hyperspektral (1)
- hyperspektral Fernerkundung (1)
- ice dam (1)
- ice dynamics (1)
- image processing (1)
- imaging (1)
- impact (1)
- impact assessment (1)
- in-situ analysis (1)
- in-situ remediation (1)
- in-stream processes (1)
- incipient continent-continent collision (1)
- indischer Monsun (1)
- induzierte Seismizität (1)
- induzierten Seismizität (1)
- inherited structures (1)
- injection (1)
- injection scheme (1)
- instrumental seismology (1)
- instrumentelle Seismologie (1)
- inter- and intra-station variability (1)
- interception (1)
- interferometry (1)
- intermontane Talverfüllungen (1)
- intermontane valley fill (1)
- inverse Modellierung (1)
- inverse Modellirung (1)
- inverse modeling (1)
- ionosphere (1)
- isostatic uplift (1)
- isostatische Hebung (1)
- isotopic fractionation (1)
- kerogen kinetics (1)
- kimmerische Orogenese (1)
- kombinatorische inverse Modellierung (1)
- kontinuierlicher Simulationsansatz (1)
- kosmische Neutronenstrahlung (1)
- kosmische Strahlung (1)
- kosmogene Radionuklid-basierte Datierung (1)
- kritische Zone (1)
- krustale Spannungen (1)
- künstliche neurale Netzwerke (1)
- lacustrine record (1)
- lagoons (1)
- lake (1)
- lake mixing (1)
- lake sediment (1)
- lake system responses (1)
- lakes (1)
- lakustrine Abfolge (1)
- land use (1)
- land-use change (1)
- landforms (1)
- landscape preferences (1)
- landscape effects (1)
- landscape hydrology (1)
- laser heating (1)
- laser-geheizte Diamantstempelzelle (1)
- laser-heated Diamond Anvil Cell (1)
- late holocene (1)
- lava fountains (1)
- lead (1)
- leaf wax (1)
- lichenometry (1)
- lineare spektrale Entmischung (1)
- lipid biomarkers (1)
- lithium (1)
- lithosphere net rotation (1)
- lithosphere stress field (1)
- lithosphärisches Spannungsfeld (1)
- local Seismicity (1)
- local structure (1)
- localized deformation (1)
- lokale Seismitität (1)
- lokale Struktur (1)
- low flow (1)
- lower mantle (1)
- lunar tides (1)
- lunare Gezeiten (1)
- lysimeter (1)
- ländliche Entwicklung (1)
- macrophytes (1)
- magma assisted continental rifting (1)
- magma degassing (1)
- magmagestütztes kontinentales Rifting (1)
- magmatic (1)
- magmatic-hydrothermal systems (1)
- magmatisch (1)
- magmatisch-hydrothermale Systeme (1)
- magmatism (1)
- magnesite (1)
- magnetic polarisation direction (1)
- magnetische Polarisationsrichtung (1)
- magnetostratigraphy (1)
- magnetotelluric (1)
- manaderos de petróleo (1)
- marine sediments (1)
- marine terrace (1)
- marine terraces (1)
- mass extinction (1)
- mass wasting (1)
- matríz mineral (1)
- maturity-related biomarkers (1)
- mehrfache Stressfaktoren (1)
- melilitite (1)
- melt structure (1)
- menschliche Einflüsse (1)
- methane hydrate (1)
- methanogenic archaea (1)
- micro-CT (1)
- microbial methane oxidation (1)
- microplate (1)
- microseismicity (1)
- microsructure (1)
- microstructural deformation mechanisms (1)
- microstructures (1)
- middle Miocene (1)
- migration (1)
- mikrobielle Gemeinschaften (1)
- mikrobielle aerobe Methanoxidation (1)
- mine face mapping (1)
- mineral composition (1)
- mineral matrix (1)
- mineral reaction (1)
- mineral weathering reactions (1)
- mineralische Matrix (1)
- mitigation (1)
- mittleres Miozän (1)
- mixture models (1)
- modelling error sources (1)
- molecular biomarkers (1)
- molekulare Biomarker (1)
- molybdenum (1)
- mountain hydrology (1)
- mountain rivers (1)
- multi-equilibrium thermobarometry (1)
- multi-hazard (1)
- multi-proxy approach (1)
- multi-stage exhumation (1)
- multiple stress factors (1)
- multiscale network (1)
- multivariate Statistik (1)
- multivariate statistics (1)
- muscovite (1)
- music information retrieval (1)
- n-alkane (1)
- n-alkanes (1)
- nachaltige Städteentwicklung (1)
- nachhaltige Entwicklung (1)
- nanoscale zero-valent iron (nZVI) (1)
- natural dams (1)
- natural hazard (1)
- natural risks (1)
- natürlichen Ölaustritten (1)
- near-surface geophysics (1)
- near-surface monitoring (1)
- near-vertical seismic reflection (1)
- neogene (1)
- neutron field (1)
- neutrons (1)
- next generation sequencing (1)
- nicht-monetäre Bewertung (1)
- nichtisothermer Mehrphasenfluss (1)
- noise reduction (1)
- non-isothermal multiphase flow (1)
- non-monetary valuation (1)
- normal faulting (1)
- northern Andes (1)
- northern high latitudes (1)
- nuclear waste disposal (1)
- numerical (1)
- numerical model (1)
- numerical models (1)
- numerisch (1)
- numerische Modelle (1)
- numerische Strömungsmechanik (1)
- nutrient retention (1)
- nutrients (1)
- nördliche Anden (1)
- nördliche hohe Breitengrade (1)
- oberflächennahe Geophysik (1)
- object based image analysis (1)
- objektbasierte Bildanalyse (1)
- observational seismology (1)
- occurrence rate (1)
- ocean color remote sensing (1)
- oceanic crust (1)
- offene Daten (1)
- offener Tagebau (1)
- oil seeps (1)
- open data (1)
- open pit mining (1)
- optical properties (1)
- optimal array configuration (1)
- optimale Array-Konfiguration (1)
- optische Eigenschaften (1)
- ore (1)
- ore deposit (1)
- organic carbon cycle (1)
- organic matter (1)
- organischer Kohlenstoff (1)
- organisches Material (1)
- organofacies (1)
- orogenic evolution (1)
- ostafrikanisches Riftsystem (1)
- outburst floods (1)
- oxygen (1)
- oxygen and carbon stable isotopes (1)
- oxygen isotopes (1)
- ozeanische Kruste (1)
- pH (1)
- palaeoclimatology (1)
- palaeointensity (1)
- palaeolimnology (1)
- palaeomagnetism (1)
- paleo-lake Mweru (1)
- paleo-strain calculation (1)
- paleo-topography (1)
- paleoaltimetry (1)
- paleofloods (1)
- paleogeography (1)
- paleohydrology (1)
- paleolimnology (1)
- paleosecular variations (1)
- participatory mapping (1)
- passive Seismik (1)
- passive seismic (1)
- pathogens (1)
- pattern recognition (1)
- periglacial landscape evolution (1)
- periglacial landscapes (1)
- periglaziale Landschaften (1)
- periglaziale Landschaftsentwicklung (1)
- permafrost degradation (1)
- permafrost landscapes (1)
- permafrost sediments (1)
- permafrost thaw disturbances (1)
- permanent deformation (1)
- permanente Verformung (1)
- permeability (1)
- permeability evolution (1)
- petrothermal systems (1)
- petrothermale Systeme (1)
- petrothermales System (EGS) (1)
- photogrammetry (1)
- phytoplankton distribution (1)
- plant waxes (1)
- plant-habitat interactions (1)
- plasmidome (1)
- plate boundary friction (1)
- plate motions (1)
- plateau uplift (1)
- plum (1)
- plume-ridge interaction (1)
- plötzliche stratosphärische Erwärmungsereignisse (1)
- polar ice (1)
- polares Eis (1)
- polarimetric decompositions (1)
- polarimetrische Dekompositionen (1)
- pollen (1)
- polymictic lakes (1)
- polymiktische Seen (1)
- polynya (1)
- porphyry copper deposit (1)
- precipitation (1)
- precision horticulture (1)
- pressure solution (1)
- probabilistic approach (1)
- probabilistischer Ansatz (1)
- process identification (1)
- psychology (1)
- quantitative data (1)
- quartäre Geochronologie (1)
- quaternary (1)
- radiación y propiedades químicas (1)
- radial flow (1)
- radiale Strömung (1)
- radiation and chemical properties (1)
- radiocarbon (1)
- radiocarbon age dating (1)
- radiogene Wärmeproduktion (1)
- radiogenic heat production (1)
- radiogenic isotopes (1)
- radiolyse (1)
- radiolysis (1)
- radiólisis (1)
- railway infrastructure (1)
- rainstorm (1)
- rapid earthquake impact assessment (1)
- rare earth elements (1)
- rate-state friction (1)
- reaction path modelling (1)
- reactive transport groundwater model (1)
- reactive transport simulation (1)
- reaktive Transportsimulation (1)
- reaktives Grundwassermodell (1)
- reef (1)
- reflection seismics (1)
- reflection seismology (1)
- regionale Hydrologie (1)
- regression analysis (1)
- regularization (1)
- residential buildings (1)
- resources (1)
- response spectra (1)
- rheology (1)
- rhizosphere (1)
- ridge-collision (1)
- rift (1)
- rift segments interaction (1)
- ring-fault (1)
- riparian zone (1)
- risk analysis (1)
- risk communication (1)
- risk model chain (1)
- rock fracture (1)
- rock glaciers (1)
- rock mechanics (1)
- rock-water interaction (1)
- rockmagnetism (1)
- rockslide (1)
- roughness (1)
- runoff (1)
- rural development (1)
- russische Arktis (1)
- räumlich explizit (1)
- räumliche Aggregation (1)
- räumliche Analyse (1)
- räumliche Kalibrierung (1)
- räumliche Variabilität (1)
- saline Seen (1)
- saline lakes (1)
- salt diffusion (1)
- salt rock (1)
- sandstones (1)
- saprolite (1)
- satellite images (1)
- savanna ecology (1)
- scale (1)
- scattered phases (1)
- scatterer location (1)
- schnelle Einschätzung von Erdbebenauswirkungen (1)
- sedaDNA (1)
- sediment fingerprinting (1)
- sediment source fingerprinting (1)
- sediment thickness (1)
- sediment transport (1)
- sediment transport modelling (1)
- sediment trap (1)
- sediment volume (1)
- sediment-routing system (1)
- sedimentary basin (1)
- sedimentary dynamics (1)
- sedimentary environments (1)
- sedimentary facies (1)
- sedimentary record (1)
- sedimentology (1)
- sediments (1)
- sedimentäre Systeme (1)
- sedimentäre alte DNA (1)
- seismic (1)
- seismic array (1)
- seismic attenuation (1)
- seismic attributes (1)
- seismic cycle modeling (1)
- seismic event localization (1)
- seismic imaging (1)
- seismic interferometry (1)
- seismic sequence stratigraphy (1)
- seismic signal processing (1)
- seismic source inversion (1)
- seismic source-time function estimation (1)
- seismic velocities (1)
- seismic velocity (1)
- seismicity and tectonics (1)
- seismicity modelling (1)
- seismics (1)
- seismische Attribute (1)
- seismische Dämpfung (1)
- seismische Ereignislokalisierung (1)
- seismische Geschwindigkeit (1)
- seismische Rauschen (1)
- seismische Sequenzstratigraphie (1)
- seismische Stapelungs-Methode (1)
- seismische Tomographie (1)
- seismisches Array (1)
- seismisches Hintergrundrauschen (1)
- seismo-electromagnetic (1)
- seismogene Kopplungszone (1)
- seismogenic coupling zone (1)
- seismotectonics (1)
- seltene Erden (1)
- shale strength (1)
- shallow-water carbonates (1)
- shear zones (1)
- shorelines (1)
- signal formation (1)
- signal propagation (1)
- silicate melt (1)
- silicate melts (1)
- silicate weathering (1)
- silikatische Schmelzen (1)
- simulações numéricas (1)
- sistemas magmático-hidrotermais (1)
- skarn (1)
- snow (1)
- snow avalanches (1)
- soil constituents mapping (1)
- soil heterogeneity (1)
- soil hydrology (1)
- soil moisture patterns (1)
- sorption (1)
- source array optimal design (1)
- source duration (1)
- source inversion (1)
- source model (1)
- source parameters (1)
- southern Turkey (1)
- spatial aggregation (1)
- spatial analyses (1)
- spatial calibration (1)
- spatial variability (1)
- spatially explicit (1)
- spectral analysis (1)
- spectral unmixing (1)
- spectro-directional (1)
- spektro-direktional (1)
- spherical harmonics (1)
- spread F (1)
- spröde Deformation (1)
- spätes Holozän (1)
- stabilen Isotopen (1)
- stable isotope (1)
- stalagmites (1)
- starker Konvektion (1)
- state-transition models (1)
- statistical seismology (1)
- statistische Seismologie (1)
- stochastic algorithms (1)
- strain localization (1)
- stratigraphic forward modelling (1)
- stratigraphische Vorwärtsmodellierung (1)
- streambed morphology (1)
- strength (1)
- stress (1)
- stress changes (1)
- stress field (1)
- stress measurement (1)
- stress modeling (1)
- stress partitioning (1)
- stress pattern (1)
- stress-tolerance genes (1)
- strike-slip (1)
- strike-slip faults (1)
- structural inheritance (1)
- strukturelle Kontrolle (1)
- subduction earthquake (1)
- subduction-accretionary complexes (1)
- subduktions-akkretions Komplexe (1)
- submarine (1)
- subsea (1)
- subsidence history (1)
- sudden stratospheric warming (1)
- sulphate reduction (1)
- superconducting gravimeter (SG) (1)
- surface (1)
- surface evolution (1)
- surface exposure dating (1)
- surface urban heat island effect (1)
- surface wave (1)
- susceptibility of the European electricity sector (1)
- suspended sediments (1)
- sustainable development (1)
- sustainable urban development (1)
- swarm mission (1)
- syntaxis (1)
- synthetic array beam power (1)
- synthetic sandstone (1)
- synthetic seismograms (1)
- synthetische Array-Strahlleistung (1)
- synthetische Seismogramme (1)
- tectonic (1)
- tectonic stress (1)
- tectonic uplift (1)
- tektonische Hebung (1)
- tektonische Spannungen (1)
- temperature field analysis (1)
- temporal gravity variations (1)
- tensile Anteile (1)
- tensile earthquakes (1)
- terrigenous input (1)
- thermal conductivity (1)
- thermal field (1)
- thermal model (1)
- thermal modelling (1)
- thermisches Feld (1)
- thermisches Modell (1)
- thermo-mechanical modeling (1)
- thermo-mechanics (1)
- thermo-mechanische Modellierung (1)
- thermobarometry (1)
- thermochemical mantle convection (1)
- thermochemischer Mantelkonvektion (1)
- thermodynamic and kinetic properties (1)
- thermodynamische und kinetische Eigenschaften (1)
- thermokarst processes (1)
- thermotolerance (1)
- tiefer Kohlenstoff (1)
- tiefes Lernen (1)
- time dependent (1)
- time scale (1)
- time series (1)
- time-series analysis (1)
- tin (1)
- tomography (1)
- topography (1)
- tourmaline (1)
- trace element partitioning (1)
- trace elements (1)
- transform fault (1)
- transformation of hydrological signals (1)
- transient earthquake patterns (1)
- transiente Erdbebenmuster (1)
- tree water status (1)
- trend analyses (1)
- triaxial deformation experiments (1)
- triaxiale Deformationsexperimente (1)
- tsunami early warning (1)
- tsunami risk (1)
- tungsten-tin deposits (1)
- turbidity modelling (1)
- turmalina (1)
- typhoons (1)
- uncertainties (1)
- uncertainty (1)
- uncertainty analysis (1)
- uncertainty estimation (1)
- unconventional shale (1)
- underground coal gasification (1)
- unkonventionelle Schiefer (1)
- unterer Mantel (1)
- uplift (1)
- upper mantle density heterogeneities (1)
- upper mantle viscosity structure (1)
- uranium (1)
- uranium-lead-dating (1)
- urban efficiency (1)
- urban form (1)
- urban heat island effect (1)
- variability (1)
- varve (1)
- vegetation cover (1)
- verbesserte geothermische Systeme (1)
- verstärkende Seen (1)
- vertical coupling (1)
- vertikale Kuppelung (1)
- vertikaler Fluss (1)
- video analysis (1)
- virtual active seismic (1)
- virtuelle aktive Seismik (1)
- virulence (1)
- volcanic glass (1)
- volcanic hazard assessment (1)
- volcanic hydrothermal systems (1)
- volcanic seismology (1)
- volcaniclastics (1)
- volcano deformation (1)
- volcano remote sensing (1)
- volcano seismology (1)
- volcanology (1)
- vulkanische Entgasungs-und Hydrothermalsysteme (1)
- vulkanische Entgasungssysteme (1)
- vulkanischer Gläser (1)
- water balance (1)
- water monitoring (1)
- water quality (1)
- water quality modelling (1)
- water rock interactions (1)
- water storage changes (1)
- water vapour (1)
- wave scattering and diffraction (1)
- weather pattern (1)
- weather patterns (1)
- weathering feedback (1)
- wind gusts (1)
- winderosion (1)
- zeitabhängige Gravitationsvariation (1)
- zentral-östliches Beringia (1)
- zentrale Anden (1)
- zentralen Anden (1)
- zinc (1)
- zirkulare Statistik (1)
- Ästuar (1)
- Ökohydrologie (1)
- Östliches Karoo-Becken (1)
- Überflutung (1)
- Überschwemmungen (1)
- Überschwemmungsflächen (1)
- Þeistareykir Iceland (1)
- Þeistareykir Island (1)
- äquatorialen Plasma-Verarmungen (1)
- äquatorialer Elektrojet (1)
- ökohydrologische Modellierung (1)
- ökologische Modellierung (1)
- ökonomische Auswirkungen (1)
- östlich-südzentrale Anden (1)
- östliche Kordillere (1)
- δ18O and δ13C stabile Isotope (1)
- δ18O and δ13C stable isotopes (1)
Institute
- Institut für Geowissenschaften (407) (remove)
Large parts of the Earth’s interior are inaccessible to direct observation, yet global geodynamic processes are governed by the physical material properties under extreme pressure and temperature conditions. It is therefore essential to investigate the deep Earth’s physical properties through in-situ laboratory experiments. With this goal in mind, the optical properties of mantle minerals at high pressure offer a unique way to determine a variety of physical properties, in a straight-forward, reproducible, and time-effective manner, thus providing valuable insights into the physical processes of the deep Earth. This thesis focusses on the system Mg-Fe-O, specifically on the optical properties of periclase (MgO) and its iron-bearing variant ferropericlase ((Mg,Fe)O), forming a major planetary building block. The primary objective is to establish links between physical material properties and optical properties. In particular the spin transition in ferropericlase, the second-most abundant phase of the lower mantle, is known to change the physical material properties. Although the spin transition region likely extends down to the core-mantle boundary, the ef-fects of the mixed-spin state, where both high- and low-spin state are present, remains poorly constrained.
In the studies presented herein, we show how optical properties are linked to physical properties such as electrical conductivity, radiative thermal conductivity and viscosity. We also show how the optical properties reveal changes in the chemical bonding. Furthermore, we unveil how the chemical bonding, the optical and other physical properties are affected by the iron spin transition. We find opposing trends in the pres-sure dependence of the refractive index of MgO and (Mg,Fe)O. From 1 atm to ~140 GPa, the refractive index of MgO decreases by ~2.4% from 1.737 to 1.696 (±0.017). In contrast, the refractive index of (Mg0.87Fe0.13)O (Fp13) and (Mg0.76Fe0.24)O (Fp24) ferropericlase increases with pressure, likely because Fe Fe interactions between adjacent iron sites hinder a strong decrease of polarizability, as it is observed with increasing density in the case of pure MgO. An analysis of the index dispersion in MgO (decreasing by ~23% from 1 atm to ~103 GPa) reflects a widening of the band gap from ~7.4 eV at 1 atm to ~8.5 (±0.6) eV at ~103 GPa. The index dispersion (between 550 and 870 nm) of Fp13 reveals a decrease by a factor of ~3 over the spin transition range (~44–100 GPa). We show that the electrical band gap of ferropericlase significantly widens up to ~4.7 eV in the mixed spin region, equivalent to an increase by a factor of ~1.7. We propose that this is due to a lower electron mobility between adjacent Fe2+ sites of opposite spin, explaining the previously observed low electrical conductivity in the mixed spin region. From the study of absorbance spectra in Fp13, we show an increasing covalency of the Fe-O bond with pressure for high-spin ferropericlase, whereas in the low-spin state a trend to a more ionic nature of the Fe-O bond is observed, indicating a bond weakening effect of the spin transition. We found that the spin transition is ultimately caused by both an increase of the ligand field-splitting energy and a decreasing spin-pairing energy of high-spin Fe2+.
The Central Andean region is characterized by diverse climate zones with sharp transitions between them. In this work, the area of interest is the South-Central Andes in northwestern Argentina that borders with Bolivia and Chile. The focus is the observation of soil moisture and water vapour with Global Navigation Satellite System (GNSS) remote-sensing methodologies. Because of the rapid temporal and spatial variations of water vapour and moisture circulations, monitoring this part of the hydrological cycle is crucial for understanding the mechanisms that control the local climate. Moreover, GNSS-based techniques have previously shown high potential and are appropriate for further investigation. This study includes both logistic-organization effort and data analysis. As for the prior, three GNSS ground stations were installed in remote locations in northwestern Argentina to acquire observations, where there was no availability of third-party data.
The methodological development for the observation of the climate variables of soil moisture and water vapour is independent and relies on different approaches. The soil-moisture estimation with GNSS reflectometry is an approximation that has demonstrated promising results, but it has yet to be operationally employed. Thus, a more advanced algorithm that exploits more observations from multiple satellite constellations was developed using data from two pilot stations in Germany. Additionally, this algorithm was slightly modified and used in a sea-level measurement campaign. Although the objective of this application is not related to monitoring hydrological parameters, its methodology is based on the same principles and helps to evaluate the core algorithm. On the other hand, water-vapour monitoring with GNSS observations is a well-established technique that is utilized operationally. Hence, the scope of this study is conducting a meteorological analysis by examining the along-the-zenith air-moisture levels and introducing indices related to the azimuthal gradient.
The results of the experiments indicate higher-quality soil moisture observations with the new algorithm. Furthermore, the analysis using the stations in northwestern Argentina illustrates the limits of this technology because of varying soil conditions and shows future research directions. The water-vapour analysis points out the strong influence of the topography on atmospheric moisture circulation and rainfall generation. Moreover, the GNSS time series allows for the identification of seasonal signatures, and the azimuthal-gradient indices permit the detection of main circulation pathways.
With Arctic ground as a huge and temperature-sensitive carbon reservoir, maintaining low ground temperatures and frozen conditions to prevent further carbon emissions that contrib-ute to global climate warming is a key element in humankind’s fight to maintain habitable con-ditions on earth. Former studies showed that during the late Pleistocene, Arctic ground condi-tions were generally colder and more stable as the result of an ecosystem dominated by large herbivorous mammals and vast extents of graminoid vegetation – the mammoth steppe. Characterised by high plant productivity (grassland) and low ground insulation due to animal-caused compression and removal of snow, this ecosystem enabled deep permafrost aggrad-ation. Now, with tundra and shrub vegetation common in the terrestrial Arctic, these effects are not in place anymore. However, it appears to be possible to recreate this ecosystem local-ly by artificially increasing animal numbers, and hence keep Arctic ground cold to reduce or-ganic matter decomposition and carbon release into the atmosphere.
By measuring thaw depth, total organic carbon and total nitrogen content, stable carbon iso-tope ratio, radiocarbon age, n-alkane and alcohol characteristics and assessing dominant vegetation types along grazing intensity transects in two contrasting Arctic areas, it was found that recreating conditions locally, similar to the mammoth steppe, seems to be possible. For permafrost-affected soil, it was shown that intensive grazing in direct comparison to non-grazed areas reduces active layer depth and leads to higher TOC contents in the active layer soil. For soil only frozen on top in winter, an increase of TOC with grazing intensity could not be found, most likely because of confounding factors such as vertical water and carbon movement, which is not possible with an impermeable layer in permafrost. In both areas, high animal activity led to a vegetation transformation towards species-poor graminoid-dominated landscapes with less shrubs. Lipid biomarker analysis revealed that, even though the available organic material is different between the study areas, in both permafrost-affected and sea-sonally frozen soils the organic material in sites affected by high animal activity was less de-composed than under less intensive grazing pressure. In conclusion, high animal activity af-fects decomposition processes in Arctic soils and the ground thermal regime, visible from reduced active layer depth in permafrost areas. Therefore, grazing management might be utilised to locally stabilise permafrost and reduce Arctic carbon emissions in the future, but is likely not scalable to the entire permafrost region.
Volcanic hydrothermal systems are an integral part of most volcanoes and typically involve a heat source, adequate fluid supply, and fracture or pore systems through which the fluids can circulate within the volcanic edifice. Associated with this are subtle but powerful processes that can significantly influence the evolution of volcanic activity or the stability of the near-surface volcanic system through mechanical weakening, permeability reduction, and sealing of the affected volcanic rock. These processes are well constrained for rock samples by laboratory analyses but are still difficult to extrapolate and evaluate at the scale of an entire volcano. Advances in unmanned aircraft systems (UAS), sensor technology, and photogrammetric processing routines now allow us to image volcanic surfaces at the centimeter scale and thus study volcanic hydrothermal systems in great detail. This thesis aims to explore the potential of UAS approaches for studying the structures, processes, and dynamics of volcanic hydrothermal systems but also to develop methodological approaches to uncover secondary information hidden in the data, capable of indicating spatiotemporal dynamics or potentially critical developments associated with hydrothermal alteration. To accomplish this, the thesis describes the investigation of two near-surface volcanic hydrothermal systems, the El Tatio geyser field in Chile and the fumarole field of La Fossa di Vulcano (Italy), both of which are among the best-studied sites of their kind. Through image analysis, statistical, and spatial analyses we have been able to provide the most detailed structural images of both study sites to date, with new insights into the driving forces of such systems but also revealing new potential controls, which are summarized in conceptual site-specific models. Furthermore, the thesis explores methodological remote sensing approaches to detect, classify and constrain hydrothermal alteration and surface degassing from UAS-derived data, evaluated them by mineralogical and chemical ground-truthing, and compares the alteration pattern with the present-day degassing activity. A significant contribution of the often neglected diffuse degassing activity to the total amount of degassing is revealed and constrains secondary processes and dynamics associated with hydrothermal alteration that lead to potentially critical developments like surface sealing. The results and methods used provide new approaches for alteration research, for the monitoring of degassing and alteration effects, and for thermal monitoring of fumarole fields, with the potential to be incorporated into volcano monitoring routines.
Rapidly growing seismic and macroseismic databases and simplified access to advanced machine learning methods have in recent years opened up vast opportunities to address challenges in engineering and strong motion seismology from novel, datacentric perspectives. In this thesis, I explore the opportunities of such perspectives for the tasks of ground motion modeling and rapid earthquake impact assessment, tasks with major implications for long-term earthquake disaster mitigation.
In my first study, I utilize the rich strong motion database from the Kanto basin, Japan, and apply the U-Net artificial neural network architecture to develop a deep learning based ground motion model. The operational prototype provides statistical estimates of expected ground shaking, given descriptions of a specific earthquake source, wave propagation paths, and geophysical site conditions. The U-Net interprets ground motion data in its spatial context, potentially taking into account, for example, the geological properties in the vicinity of observation sites. Predictions of ground motion intensity are thereby calibrated to individual observation sites and earthquake locations.
The second study addresses the explicit incorporation of rupture forward directivity into ground motion modeling. Incorporation of this phenomenon, causing strong, pulse like ground shaking in the vicinity of earthquake sources, is usually associated with an intolerable increase in computational demand during probabilistic seismic hazard analysis (PSHA) calculations. I suggest an approach in which I utilize an artificial neural network to efficiently approximate the average, directivity-related adjustment to ground motion predictions for earthquake ruptures from the 2022 New Zealand National Seismic Hazard Model. The practical implementation in an actual PSHA calculation demonstrates the efficiency and operational readiness of my model. In a follow-up study, I present a proof of concept for an alternative strategy in which I target the generalizing applicability to ruptures other than those from the New Zealand National Seismic Hazard Model.
In the third study, I address the usability of pseudo-intensity reports obtained from macroseismic observations by non-expert citizens for rapid impact assessment. I demonstrate that the statistical properties of pseudo-intensity collections describing the intensity of shaking are correlated with the societal impact of earthquakes. In a second step, I develop a probabilistic model that, within minutes of an event, quantifies the probability of an earthquake to cause considerable societal impact. Under certain conditions, such a quick and preliminary method might be useful to support decision makers in their efforts to organize auxiliary measures for earthquake disaster response while results from more elaborate impact assessment frameworks are not yet available.
The application of machine learning methods to datasets that only partially reveal characteristics of Big Data, qualify the majority of results obtained in this thesis as explorative insights rather than ready-to-use solutions to real world problems. The practical usefulness of this work will be better assessed in the future by applying the approaches developed to growing and increasingly complex data sets.
A comprehensive study on seismic hazard and earthquake triggering is crucial for effective mitigation of earthquake risks. The destructive nature of earthquakes motivates researchers to work on forecasting despite the apparent randomness of the earthquake occurrences. Understanding their underlying mechanisms and patterns is vital, given their potential for widespread devastation and loss of life. This thesis combines methodologies, including Coulomb stress calculations and aftershock analysis, to shed light on earthquake complexities, ultimately enhancing seismic hazard assessment.
The Coulomb failure stress (CFS) criterion is widely used to predict the spatial distributions of aftershocks following large earthquakes. However, uncertainties associated with CFS calculations arise from non-unique slip inversions and unknown fault networks, particularly due to the choice of the assumed aftershocks (receiver) mechanisms. Recent studies have proposed alternative stress quantities and deep neural network approaches as superior to CFS with predefined receiver mechanisms. To challenge these propositions, I utilized 289 slip inversions from the SRCMOD database to calculate more realistic CFS values for a layered-half space and variable receiver mechanisms. The analysis also investigates the impact of magnitude cutoff, grid size variation, and aftershock duration on the ranking of stress metrics using receiver operating characteristic (ROC) analysis. Results reveal the performance of stress metrics significantly improves after accounting for receiver variability and for larger aftershocks and shorter time periods, without altering the relative ranking of the different stress metrics.
To corroborate Coulomb stress calculations with the findings of earthquake source studies in more detail, I studied the source properties of the 2005 Kashmir earthquake and its aftershocks, aiming to unravel the seismotectonics of the NW Himalayan syntaxis. I simultaneously relocated the mainshock and its largest aftershocks using phase data, followed by a comprehensive analysis of Coulomb stress changes on the aftershock planes. By computing the Coulomb failure stress changes on the aftershock faults, I found that all large aftershocks lie in regions of positive stress change, indicating triggering by either co-seismic or post-seismic slip on the mainshock fault.
Finally, I investigated the relationship between mainshock-induced stress changes and associated seismicity parameters, in particular those of the frequency-magnitude (Gutenberg-Richter) distribution and the temporal aftershock decay (Omori-Utsu law). For that purpose, I used my global data set of 127 mainshock-aftershock sequences with the calculated Coulomb Stress (ΔCFS) and the alternative receiver-independent stress metrics in the vicinity of the mainshocks and analyzed the aftershocks properties depend on the stress values. Surprisingly, the results show a clear positive correlation between the Gutenberg-Richter b-value and induced stress, contrary to expectations from laboratory experiments. This observation highlights the significance of structural heterogeneity and strength variations in seismicity patterns. Furthermore, the study demonstrates that aftershock productivity increases nonlinearly with stress, while the Omori-Utsu parameters c and p systematically decrease with increasing stress changes. These partly unexpected findings have significant implications for future estimations of aftershock hazard.
The findings in this thesis provides valuable insights into earthquake triggering mechanisms by examining the relationship between stress changes and aftershock occurrence. The results contribute to improved understanding of earthquake behavior and can aid in the development of more accurate probabilistic-seismic hazard forecasts and risk reduction strategies.
Today, near-surface investigations are frequently conducted using non-destructive or minimally invasive methods of applied geophysics, particularly in the fields of civil engineering, archaeology, geology, and hydrology. One field that plays an increasingly central role in research and engineering is the examination of sedimentary environments, for example, for characterizing near-surface groundwater systems. A commonly employed method in this context is ground-penetrating radar (GPR). In this technique, short electromagnetic pulses are emitted into the subsurface by an antenna, which are then reflected, refracted, or scattered at contrasts in electromagnetic properties (such as the water table). A receiving antenna records these signals in terms of their amplitudes and travel times. Analysis of the recorded signals allows for inferences about the subsurface, such as the depth of the groundwater table or the composition and characteristics of near-surface sediment layers. Due to the high resolution of the GPR method and continuous technological advancements, GPR data acquisition is increasingly performed in three-dimensional (3D) fashion today.
Despite the considerable temporal and technical efforts involved in data acquisition and processing, the resulting 3D data sets (providing high-resolution images of the subsurface) are typically interpreted manually. This is generally an extremely time-consuming analysis step. Therefore, representative 2D sections highlighting distinctive reflection structures are often selected from the 3D data set. Regions showing similar structures are then grouped into so-called radar facies. The results obtained from 2D sections are considered representative of the entire investigated area. Interpretations conducted in this manner are often incomplete and highly dependent on the expertise of the interpreters, making them generally non-reproducible.
A promising alternative or complement to manual interpretation is the use of GPR attributes. Instead of using the recorded data directly, derived quantities characterizing distinctive reflection structures in 3D are applied for interpretation. Using various field and synthetic data sets, this thesis investigates which attributes are particularly suitable for this purpose. Additionally, the study demonstrates how selected attributes can be utilized through specific processing and classification methods to create 3D facies models. The ability to generate attribute-based 3D GPR facies models allows for partially automated and more efficient interpretations in the future. Furthermore, the results obtained in this manner describe the subsurface in a reproducible and more comprehensive manner than what has typically been achievable through manual interpretation methods.
The role of biogenic carbonate producers in the evolution of the geometries of carbonate systems has been the subject of numerous research projects. Attempts to classify modern and ancient carbonate systems by their biotic components have led to the discrimination of biogenic carbonate producers broadly into Photozoans, which are characterised by an affinity for warm tropical waters and high dependence on light penetration, and Heterozoans which are generally associated with both cool water environments and nutrient-rich settings with little to no light penetration. These broad categories of carbonate sediment producers have also been recognised to dominate in specific carbonate systems. Photozoans are commonly dominant in flat-topped platforms with steep margins, while Heterozoans generally dominate carbonate ramps. However, comparatively little is known on how these two main groups of carbonate producers interact in the same system and impact depositional geometries responding to changes in environmental conditions such as sea level fluctuation, antecedent slope, sediment transport processes, etc. This thesis presents numerical models to investigate the evolution of Miocene carbonate systems in the Mediterranean from two shallow marine domains: 1) a Miocene flat-topped platform dominated by Photozoans, with a significant component of Hetrozoans in the slope and 2) a Heterozoan distally steepened ramp, with seagrass-influenced (Photozoan) inner ramp. The overarching aim of the three articles comprising this cumulative thesis is to provide a numerical study of the role of Photozoans and Heterozoans in the evolution of carbonate system geometries and how these biotas respond to changes in environmental conditions. This aim was achieved using stratigraphic forward modelling, which provides an approach to quantitatively integrate multi-scale datasets to reconstruct sedimentary processes and products during the evolution of a sedimentary system.
In a Photozoan-dominated carbonate system, such as the Miocene Llucmajor platform in Western Mediterranean, stratigraphic forward modelling dovetailed with a robust set of sensitivity tests reveal how the geometry of the carbonate system is determined by the complex interaction of Heterozoan and Photozoan biotas in response to variable conditions of sea level fluctuation, substrate configuration, sediment transport processes and the dominance of Photozoan over Heterozoan production. This study provides an enhanced understanding of the different carbonate systems that are possible under different ecological and hydrodynamic conditions. The research also gives insight into the roles of different biotic associations in the evolution of carbonate geometries through time and space. The results further show that the main driver of platform progradation in a Llucmajor-type system is the lowstand production of Heterozoan sediments, which form the necessary substratum for Photozoan production.
In Heterozoan systems, sediment production is mainly characterised by high transport deposits, that are prone to redistribution by waves and gravity, thereby precluding the development of steep margins. However, in the Menorca ramp, the occurrence of sediment trapping by seagrass led to the evolution of distal slope steepening. We investigated, through numerical modelling, how such a seagrass-influenced ramp responds to the frequency and amplitude of sea level changes, variable carbonate production between the euphotic and oligophotic zone, and changes in the configuration of the paleoslope. The study reinforces some previous hypotheses and presents alternative scenarios to the established concepts of high-transport ramp evolution. The results of sensitivity experiments show that steep slopes are favoured in ramps that develop in high-frequency sea level fluctuation with amplitudes between 20 m and 40 m. We also show that ramp profiles are significantly impacted by the paleoslope inclination, such that an optimal antecedent slope of about 0.15 degrees is required for the Menorca distally steepened ramp to develop.
The third part presents an experimental case to argue for the existence of a Photozoan sediment threshold required for the development of steep margins in carbonate platforms. This was carried out by developing sensitivity tests on the forward models of the flat-topped (Llucmajor) platform and the distally steepened (Menorca) platform. The results show that models with Photozoan sediment proportion below a threshold of about 40% are incapable of forming steep slopes. The study also demonstrates that though it is possible to develop steep margins by seagrass sediment trapping, such slopes can only be stabilized by the appropriate sediment fabric and/or microbial binding. In the Photozoan-dominated system, the magnitude of slope steepness depends on the proportion of Photozoan sediments in the system. Therefore, this study presents a novel tool for characterizing carbonate systems based on their biogenic components.
The East African Rift System (EARS) is a significant example of active tectonics, which provides opportunities to examine the stages of continental faulting and landscape evolution. The southwest extension of the EARS is one of the most significant examples of active tectonics nowadays, however, seismotectonic research in the area has been scarce, despite the fundamental importance of neotectonics. Our first study area is located between the Northern Province of Zambia and the southeastern Katanga Province of the Democratic Republic of Congo. Lakes Mweru and Mweru Wantipa are part of the southwest extension of the EARS. Fault analysis reveals that, since the Miocene, movements along the active Mweru-Mweru Wantipa Fault System (MMFS) have been largely responsible for the reorganization of the landscape and the drainage patterns across the southwestern branch of the EARS. To investigate the spatial and temporal patterns of fluvial-lacustrine landscape development, we determined in-situ cosmogenic 10Be and 26Al in a total of twenty-six quartzitic bedrock samples that were collected from knickpoints across the Mporokoso Plateau (south of Lake Mweru) and the eastern part of the Kundelungu Plateau (north of Lake Mweru). Samples from the Mporokoso Plateau and close to the MMFS provide evidence of temporary burial. By contrast, surfaces located far from the MMFS appear to have remained uncovered since their initial exposure as they show consistent 10Be and 26Al exposure ages ranging up to ~830 ka. Reconciliation of the observed burial patterns with morphotectonic and stratigraphic analysis reveals the existence of an extensive paleo-lake during the Pleistocene. Through hypsometric analyses of the dated knickpoints, the potential maximum water level of the paleo-lake is constrained to ~1200 m asl (present lake lavel: 917 m asl). High denudation rates (up to ~40 mm ka-1) along the eastern Kundelungu Plateau suggest that footwall uplift, resulting from normal faulting, caused river incision, possibly controlling paleo-lake drainage. The lake level was reduced gradually reaching its current level at ~350 ka.
Parallel to the MMFS in the north, the Upemba Fault System (UFS) extends across the southeastern Katanga Province of the Democratic Republic of Congo. This part of our research is focused on the geomorphological behavior of the Kiubo Waterfalls. The waterfalls are the currently active knickpoint of the Lufira River, which flows into the Upemba Depression. Eleven bedrock samples along the Lufira River and its tributary stream, Luvilombo River, were collected. In-situ cosmogenic 10Be and 26Al were used in order to constrain the K constant of the Stream Power Law equation. Constraining the K constant allowed us to calculate the knickpoint retreat rate of the Kiubo Waterfalls at ~0.096 m a-1. Combining the calculated retreat rate of the knickpoint with DNA sequencing from fish populations, we managed to present extrapolation models and estimate the location of the onset of the Kiubo Waterfalls, revealing its connection to the seismicity of the UFS.
Advances in hydrogravimetry
(2023)
The interest of the hydrological community in the gravimetric method has steadily increased within the last decade. This is reflected by numerous studies from many different groups with a broad range of approaches and foci. Many of those are traditionally rather hydrology-oriented groups who recognized gravimetry as a potential added value for their hydrological investigations. While this resulted in a variety of interesting and useful findings, contributing to extend the respective knowledge and confirming the methodological potential, on the other hand, many interesting and unresolved questions emerged.
This thesis manifests efforts, analyses and solutions carried out in this regard. Addressing and evaluating many of those unresolved questions, the research contributes to advancing hydrogravimetry, the combination of gravimetric and hydrological methods, in showing how gravimeters are a highly useful tool for applied hydrological field research.
In the first part of the thesis, traditional setups of stationary terrestrial superconducting gravimeters are addressed. They are commonly installed within a dedicated building, the impermeable structure of which shields the underlying soil from natural exchange of water masses (infiltration, evapotranspiration, groundwater recharge). As gravimeters are most sensitive to mass changes directly beneath the meter, this could impede their suitability for local hydrological process investigations, especially for near-surface water storage changes (WSC). By studying temporal local hydrological dynamics at a dedicated site equipped with traditional hydrological measurement devices, both below and next to the building, the impact of these absent natural dynamics on the gravity observations were quantified. A comprehensive analysis with both a data-based and model-based approach led to the development of an alternative method for dealing with this limitation. Based on determinable parameters, this approach can be transferred to a broad range of measurement sites where gravimeters are deployed in similar structures. Furthermore, the extensive considerations on this topic enabled a more profound understanding of this so called umbrella effect.
The second part of the thesis is a pilot study about the field deployment of a superconducting gravimeter. A newly developed field enclosure for this gravimeter was tested in an outdoor installation adjacent to the building used to investigate the umbrella effect. Analyzing and comparing the gravity observations from both indoor and outdoor gravimeters showed performance with respect to noise and stable environmental conditions was equivalent while the sensitivity to near-surface WSC was highly increased for the field deployed instrument. Furthermore it was demonstrated that the latter setup showed gravity changes independent of the depth where mass changes occurred, given their sufficiently wide horizontal extent. As a consequence, the field setup suits monitoring of WSC for both short and longer time periods much better. Based on a coupled data-modeling approach, its gravity time series was successfully used to infer and quantify local water budget components (evapotranspiration, lateral subsurface discharge) on the daily to annual time scale.
The third part of the thesis applies data from a gravimeter field deployment for applied hydrological process investigations. To this end, again at the same site, a sprinkling experiment was conducted in a 15 x 15 m area around the gravimeter. A simple hydro-gravimetric model was developed for calculating the gravity response resulting from water redistribution in the subsurface. It was found that, from a theoretical point of view, different subsurface water distribution processes (macro pore flow, preferential flow, wetting front advancement, bypass flow and perched water table rise) lead to a characteristic shape of their resulting gravity response curve. Although by using this approach it was possible to identify a dominating subsurface water distribution process for this site, some clear limitations stood out. Despite the advantage for field installations that gravimetry is a non-invasive and integral method, the problem of non-uniqueness could only be overcome by additional measurements (soil moisture, electric resistivity tomography) within a joint evaluation. Furthermore, the simple hydrological model was efficient for theoretical considerations but lacked the capability to resolve some heterogeneous spatial structures of water distribution up to a needed scale. Nevertheless, this unique setup for plot to small scale hydrological process research underlines the high potential of gravimetery and the benefit of a field deployment.
The fourth and last part is dedicated to the evaluation of potential uncertainties arising from the processing of gravity observations. The gravimeter senses all mass variations in an integral way, with the gravitational attraction being directly proportional to the magnitude of the change and inversely proportional to the square of the distance of the change. Consequently, all gravity effects (for example, tides, atmosphere, non-tidal ocean loading, polar motion, global hydrology and local hydrology) are included in an aggregated manner. To isolate the signal components of interest for a particular investigation, all non-desired effects have to be removed from the observations. This process is called reduction. The large-scale effects (tides, atmosphere, non-tidal ocean loading and global hydrology) cannot be measured directly and global model data is used to describe and quantify each effect. Within the reduction process, model errors and uncertainties propagate into the residual, the result of the reduction. The focus of this part of the thesis is quantifying the resulting, propagated uncertainty for each individual correction. Different superconducting gravimeter installations were evaluated with respect to their topography, distance to the ocean and the climate regime. Furthermore, different time periods of aggregated gravity observation data were assessed, ranging from 1 hour up to 12 months. It was found that uncertainties were highest for a frequency of 6 months and smallest for hourly frequencies. Distance to the ocean influences the uncertainty of the non-tidal ocean loading component, while geographical latitude affects uncertainties of the global hydrological component. It is important to highlight that the resulting correction-induced uncertainties in the residual have the potential to mask the signal of interest, depending on the signal magnitude and its frequency. These findings can be used to assess the value of gravity data across a range of applications and geographic settings.
In an overarching synthesis all results and findings are discussed with a general focus on their added value for bringing hydrogravimetric field research to a new level. The conceptual and applied methodological benefits for hydrological studies are highlighted. Within an outlook for future setups and study designs, it was once again shown what enormous potential is offered by gravimeters as hydrological field tools.
Carbonates carried in subducting slabs may play a major role in sourcing and storing carbon in the deep Earth’s interior. Current estimates indicate that between 40 to 66 million tons of carbon per year enter subduction zones, but it is uncertain how much of it reaches the lower mantle. It appears that most of this carbon might be extracted from subducting slabs at the mantle wedge and only a limited amount continues deeper and eventually reaches the deep mantle. However, estimations on deeply subducted carbon broadly range from 0.0001 to 52 million tons of carbon per year. This disparity is primarily due to the limited understanding of the survival of carbonate minerals during their transport to deep mantle conditions. Indeed, carbon has very low solubility in mantle silicates, therefore it is expected to be stored primarily in accessory phases such as carbonates. Among those carbonates, magnesite (MgCO3), as a single phase, is the most stable under all mantle conditions. However, experimental investigation on the stability of magnesite in contact with SiO2 at lower mantle conditions suggests that magnesite is stable only along a cold subducted slab geotherm. Furthermore, our understanding of magnesite’s stability when interacting with more complex mantle silicate phases remains incomplete. In the first part of this dissertation, laser-heated diamond anvil cells and multi-anvil apparatus experiments were performed to investigate the stability of magnesite in contact with iron-bearing mantle silicates. Sub-solidus reactions, melting, decarbonation and diamond formation were examined from shallow to mid-lower mantle conditions (25 to 68 GPa; 1300 to 2000 K). Multi-anvil experiments at 25 GPa show the formation of carbonate-rich melt, bridgmanite, and stishovite with melting occurring at a temperature corresponding to all geotherms except the coldest one. In situ X-ray diffraction, in laser-heating diamond anvil cells experiments, shows crystallization of bridgmanite and stishovite but no melt phase was detected in situ at high temperatures. To detect decarbonation phases such as diamond, Raman spectroscopy was used. Crystallization of diamonds is observed as a sub-solidus process even at temperatures relevant and lower than the coldest slab geotherm (1350 K at 33 GPa). Data obtained from this work suggest that magnesite is unstable in contact with the surrounding peridotite mantle in the upper-most lower mantle. The presence of magnesite instead induces melting under oxidized conditions and/or foster diamond formation under more reduced conditions, at depths ∼700 km. Consequently, carbonates will be removed from the carbonate-rich slabs at shallow lower mantle conditions, where subducted slabs can stagnate. Therefore, the transport of carbonate to deeper depths will be restricted, supporting the presence of a barrier for carbon subduction at the top of the lower mantle. Moreover, the reduction of magnesite, forming diamonds provides additional evidence that super-deep diamond crystallization is related to the reduction of carbonates or carbonated-rich melt.
The second part of this dissertation presents the development of a portable laser-heating system optimized for X-ray emission spectroscopy (XES) or nuclear inelastic scattering (NIS) spectroscopy with signal collection at near 90◦. The laser-heated diamond anvil cell is the only static pressure device that can replicate the pressure and temperatures of the Earth’s lower mantle and core. The high temperatures are reached by using high-powered lasers focused on the sample contained between the diamond anvils. Moreover, diamonds’ transparency to X-rays enables in situ X-ray spectroscopy measurements that can probe the sample under high-temperature and high-pressure conditions. Therefore, the development of portable laser-heating systems has linked high-pressure and temperature research with high-resolution X-ray spectroscopy techniques to synchrotron beamlines that do not have a dedicated, permanent, laser-heating system. A general description of the system is provided, as well as details on the use of a parabolic mirror as a reflective imaging objective for on-axis laser heating and radiospectrometric temperature measurements with zero attenuation of incoming X-rays. The parabolic mirror improves the accuracy of temperature measurements free from chromatic aberrations in a wide spectral range and its perforation permits in situ X-rays measurement at synchrotron facilities. The parabolic mirror is a well-suited alternative to refractive objectives in laser heating systems, which will facilitate future applications in the use of CO2 lasers.
Natural gas hydrates are ice-like crystalline compounds containing water cavities that trap natural gas molecules like methane (CH4), which is a potent greenhouse gas with high energy density. The Mallik site at the Mackenzie Delta in the Canadian Arctic contains a large volume of technically recoverable CH4 hydrate beneath the base of the permafrost. Understanding how the sub-permafrost hydrate is distributed can aid in searching for the ideal locations for deploying CH4 production wells to develop the hydrate as a cleaner alternative to crude oil or coal. Globally, atmospheric warming driving permafrost thaw results in sub-permafrost hydrate dissociation, releasing CH4 into the atmosphere to intensify global warming. It is therefore crucial to evaluate the potential risk of hydrate dissociation due to permafrost degradation. To quantitatively predict hydrate distribution and volume in complex sub-permafrost environments, a numerical framework was developed to simulate sub-permafrost hydrate formation by coupling the equilibrium CH4-hydrate formation approach with a fluid flow and transport simulator (TRANSPORTSE). In addition, integrating the equations of state describing ice melting and forming with TRANSPORTSE enabled this framework to simulate the permafrost evolution during the sub-permafrost hydrate formation. A modified sub-permafrost hydrate formation mechanism for the Mallik site is presented in this study. According to this mechanism, the CH4-rich fluids have been vertically transported since the Late Pleistocene from deep overpressurized zones via geologic fault networks to form the observed hydrate deposits in the Kugmallit–Mackenzie Bay Sequences. The established numerical framework was verified by a benchmark of hydrate formation via dissolved methane. Model calibration was performed based on laboratory data measured during a multi-stage hydrate formation experiment undertaken in the LArge scale Reservoir Simulator (LARS). As the temporal and spatial evolution of simulated and observed hydrate saturation matched well, the LARS model was therefore validated. This laboratory-scale model was then upscaled to a field-scale 2D model generated from a seismic transect across the Mallik site. The simulation confirmed the feasibility of the introduced sub-permafrost hydrate formation mechanism by demonstrating consistency with field observations. The 2D model was extended to the first 3D model of the Mallik site by using well-logs and seismic profiles, to investigate the geologic controls on the spatial hydrate distribution. An assessment of this simulation revealed the hydraulic contribution of each geological element, including relevant fault networks and sedimentary sequences. Based on the simulation results, the observed heterogeneous distribution of sub-permafrost hydrate resulted from the combined factors of the source-gas generation rate, subsurface temperature, and the permeability of geologic elements. Analysis of the results revealed that the Mallik permafrost was heated by 0.8–1.3 °C, induced by the global temperature increase of 0.44 °C and accelerated by Arctic amplification from the early 1970s to the mid-2000s. This study presents a numerical framework that can be applied to study the formation of the permafrost-hydrate system from laboratory to field scales, across timescales ranging from hours to millions of years. Overall, these simulations deepen the knowledge about the dominant factors controlling the spatial hydrate distribution in sub-permafrost environments with heterogeneous geologic elements. The framework can support improving the design of hydrate formation experiments and provide valuable contributions to future industrial hydrate exploration and exploitation activities.
Magmatic-hydrothermal systems form a variety of ore deposits at different proximities to upper-crustal hydrous magma chambers, ranging from greisenization in the roof zone of the intrusion, porphyry mineralization at intermediate depths to epithermal vein deposits near the surface. The physical transport processes and chemical precipitation mechanisms vary between deposit types and are often still debated.
The majority of magmatic-hydrothermal ore deposits are located along the Pacific Ring of Fire, whose eastern part is characterized by the Mesozoic to Cenozoic orogenic belts of the western North and South Americas, namely the American Cordillera. Major magmatic-hydrothermal ore deposits along the American Cordillera include (i) porphyry Cu(-Mo-Au) deposits (along the western cordilleras of Mexico, the western U.S., Canada, Chile, Peru, and Argentina); (ii) Climax- (and sub−) type Mo deposits (Colorado Mineral Belt and northern New Mexico); and (iii) porphyry and IS-type epithermal Sn(-W-Ag) deposits of the Central Andean Tin Belt (Bolivia, Peru and northern Argentina).
The individual studies presented in this thesis primarily focus on the formation of different styles of mineralization located at different proximities to the intrusion in magmatic-hydrothermal systems along the American Cordillera. This includes (i) two individual geochemical studies on the Sweet Home Mine in the Colorado Mineral Belt (potential endmember of peripheral Climax-type mineralization); (ii) one numerical modeling study setup in a generic porphyry Cu-environment; and (iii) a numerical modeling study on the Central Andean Tin Belt-type Pirquitas Mine in NW Argentina.
Microthermometric data of fluid inclusions trapped in greisen quartz and fluorite from the Sweet Home Mine (Detroit City Portal) suggest that the early-stage mineralization precipitated from low- to medium-salinity (1.5-11.5 wt.% equiv. NaCl), CO2-bearing fluids at temperatures between 360 and 415°C and at depths of at least 3.5 km. Stable isotope and noble gas isotope data indicate that greisen formation and base metal mineralization at the Sweet Home Mine was related to fluids of different origins. Early magmatic fluids were the principal source for mantle-derived volatiles (CO2, H2S/SO2, noble gases), which subsequently mixed with significant amounts of heated meteoric water. Mixing of magmatic fluids with meteoric water is constrained by δ2Hw-δ18Ow relationships of fluid inclusions. The deep hydrothermal mineralization at the Sweet Home Mine shows features similar to deep hydrothermal vein mineralization at Climax-type Mo deposits or on their periphery. This suggests that fluid migration and the deposition of ore and gangue minerals in the Sweet Home Mine was triggered by a deep-seated magmatic intrusion.
The second study on the Sweet Home Mine presents Re-Os molybdenite ages of 65.86±0.30 Ma from a Mo-mineralized major normal fault, namely the Contact Structure, and multimineral Rb-Sr isochron ages of 26.26±0.38 Ma and 25.3±3.0 Ma from gangue minerals in greisen assemblages. The age data imply that mineralization at the Sweet Home Mine formed in two separate events: Late Cretaceous (Laramide-related) and Oligocene (Rio Grande Rift-related). Thus, the age of Mo mineralization at the Sweet Home Mine clearly predates that of the Oligocene Climax-type deposits elsewhere in the Colorado Mineral Belt. The Re-Os and Rb-Sr ages also constrain the age of the latest deformation along the Contact Structure to between 62.77±0.50 Ma and 26.26±0.38 Ma, which was employed and/or crosscut by Late Cretaceous and Oligocene fluids. Along the Contact Structure Late Cretaceous molybdenite is spatially associated with Oligocene minerals in the same vein system, a feature that precludes molybdenite recrystallization or reprecipitation by Oligocene ore fluids.
Ore precipitation in porphyry copper systems is generally characterized by metal zoning (Cu-Mo to Zn-Pb-Ag), which is suggested to be variably related to solubility decreases during fluid cooling, fluid-rock interactions, partitioning during fluid phase separation and mixing with external fluids. The numerical modeling study setup in a generic porphyry Cu-environment presents new advances of a numerical process model by considering published constraints on the temperature- and salinity-dependent solubility of Cu, Pb and Zn in the ore fluid. This study investigates the roles of vapor-brine separation, halite saturation, initial metal contents, fluid mixing, and remobilization as first-order controls of the physical hydrology on ore formation. The results show that the magmatic vapor and brine phases ascend with different residence times but as miscible fluid mixtures, with salinity increases generating metal-undersaturated bulk fluids. The release rates of magmatic fluids affect the location of the thermohaline fronts, leading to contrasting mechanisms for ore precipitation: higher rates result in halite saturation without significant metal zoning, lower rates produce zoned ore shells due to mixing with meteoric water. Varying metal contents can affect the order of the final metal precipitation sequence. Redissolution of precipitated metals results in zoned ore shell patterns in more peripheral locations and also decouples halite saturation from ore precipitation.
The epithermal Pirquitas Sn-Ag-Pb-Zn mine in NW Argentina is hosted in a domain of metamorphosed sediments without geological evidence for volcanic activity within a distance of about 10 km from the deposit. However, recent geochemical studies of ore-stage fluid inclusions indicate a significant contribution of magmatic volatiles. This study tested different formation models by applying an existing numerical process model for porphyry-epithermal systems with a magmatic intrusion located either at a distance of about 10 km underneath the nearest active volcano or hidden underneath the deposit. The results show that the migration of the ore fluid over a 10-km distance results in metal precipitation by cooling before the deposit site is reached. In contrast, simulations with a hidden magmatic intrusion beneath the Pirquitas deposit are in line with field observations, which include mineralized hydrothermal breccias in the deposit area.
During the Cenozoic, global cooling and uplift of the Tian Shan, Pamir, and Tibetan plateau modified atmospheric circulation and reduced moisture supply to Central Asia. These changes led to aridification in the region during the Neogene. Afterwards, Quaternary glaciations led to modification of the landscape and runoff.
In the Issyk-Kul basin of the Kyrgyz Tian Shan, the sedimentary sequences reflect the development of the adjacent ranges and local climatic conditions. In this work, I reconstruct the late Miocene – early Pleistocene depositional environment, climate, and lake development in the Issyk-Kul basin using facies analyses and stable δ18O and δ13C isotopic records from sedimentary sections dated by magnetostratigraphy and 26Al/10Be isochron burial dating. Also, I present 10Be-derived millennial-scale modern and paleo-denudation rates from across the Kyrgyz Tian Shan and long-term exhumation rates calculated from published thermochronology data. This allows me to examine spatial and temporal changes in surface processes in the Kyrgyz Tian Shan.
In the Issyk-Kul basin, the style of fluvial deposition changed at ca. 7 Ma, and aridification in the basin commenced concurrently, as shown by magnetostratigraphy and the δ18O and δ13C data. Lake formation commenced on the southern side of the basin at ca. 5 Ma, followed by a ca. 2 Ma local depositional hiatus. 26Al/10Be isochron burial dating and paleocurrent analysis show that the Kungey range to the north of the basin grew eastward, leading to a change from fluvial-alluvial deposits to proximal alluvial fan conglomerates at 5-4 Ma in the easternmost part of the basin. This transition occurred at 2.6-2.8 Ma on the southern side of the basin, synchronously with the intensification of the Northern Hemisphere glaciation. The paleo-denudation rates from 2.7-2.0 Ma are as low as long-term exhumation rates, and only the millennial-scale denudation rates record an acceleration of denudation.
This work concludes that the growth of the ranges to the north of the basin led to creation of the topographic barrier at ca. 7 Ma and a subsequent aridification in the Issyk-Kul basin. Increased subsidence and local tectonically-induced river system reorganization on the southern side of the basin enabled lake formation at ca. 5 Ma, while growth of the Kungey range blocked westward-draining rivers and led to sediment starvation and lake expansion. Denudational response of the Kyrgyz Tian Shan landscape is delayed due to aridity and only substantial cooling during the late Quaternary glacial cycles led to notable acceleration of denudation. Currently, increased glacier reduction and runoff controls a more rapid denudation of the northern slope of the Terskey range compared to other ranges of the Kyrgyz Tian Shan.
The North Pamir, part of the India-Asia collision zone, essentially formed during the late Paleozoic to late Triassic–early Jurassic. Coeval to the subduction of the Turkestan ocean—during the Carboniferous Hercynian orogeny in the Tien Shan—a portion of the Paleo-Tethys ocean subducted northward and lead to the formation and obduction of a volcanic arc. This Carboniferous North Pamir arc is of Andean style in the western Darvaz segment and trends towards an intraoceanic arc in the eastern, Oytag segment. A suite of arc-volcanic rocks and intercalated, marine sediments together with intruded voluminous plagiogranites (trondhjemite and tonalite) and granodiorites was uplifted and eroded during the Permian, as demonstrated by widespread sedimentary unconformities. Today it constitutes a major portion of the North Pamir.
In this work, the first comprehensive Uranium-Lead (U-Pb) laser-ablation inductively-coupled-plasma mass-spectrometry (LA-ICP-MS) radiometric age data are presented along with geochemical data from the volcanic and plutonic rocks of the North Pamir volcanic arc. Zircon U-Pb data indicate a major intrusive phase between 340 and 320 Ma. The magmatic rocks show an arc-signature, with more primitive signatures in the Oytag segment compared to the Darvaz segment. Volcanic rocks in the Chinese North Pamir were indirectly dated by determining the age of ocean floor alteration. We investigate calcite filled vesicles and show that oxidative sea water and the basaltic host rock are major trace element sources. The age of ocean floor alteration, within a range of 25 Ma, constrains the extrusion age of the volcanic rocks. In the Chinese Pamir, arc-volcanic basalts have been dated to the Visean-Serpukhovian boundary. This relates the North Pamir volcanic arc to coeval units in the Tien Shan. Our findings further question the idea of a continuous Tarim-Tajik continent in the Paleozoic.
From the Permian (Guadalupian) on, a progressive sea-retreat led to continental conditions in the northeastern Pamir. Large parts of Central Asia were affected by transcurrent tectonics, while subduction of the Paleo-Tethys went on south of the accreted North Pamir arc, likely forming an accretionary wedge, representing an early stage of the later Karakul-Mazar tectonic unit. Graben systems dissected the Permian carbonate platforms, that formed on top of the uplifted Carboniferous arc in the central and western North Pamir. A continental graben formed in the eastern North Pamir. Zircon U-Pb dating suggest initiation of volcanic activity at ~260 Ma. Extensional tectonics prevailed throughout the Triassic, forming the Hindukush-North Pamir rift system. New geochemistry and zircon U-Pb data tie volcanic rocks, found in the Chinese Pamir, to coeval arc-related plutonic rocks found within the Karakul-Mazar arc-accretionary complex. The sedimentary environment in the continental North Pamir rift evolved from an alluvial plain, lake dominated environment in the Guadalupian to a coarser-clastic, alluvial, braided river dominated in the Triassic. Volcanic activity terminated in the early Jurassic. We conducted Potassium-Argon (K-Ar) fine-fraction dating on the Shala Tala thrust fault, a major structure juxtaposing Paleozoic marine units of lower greenschist to amphibolite facies conditions against continental Permian deposits. Fault slip under epizonal conditions is dated to 204.8 ± 3.7 Ma (2σ), implying Rhaetian nappe emplacement. This pinpoints the Central–North Pamir collision, since the Shala Tala thrust was a back-thrust at that time.
The Andean Cordillera is a mountain range located at the western South American margin and is part of the Eastern- Circum-Pacific orogenic Belt. The ~7000 km long mountain range is one of the longest on Earth and hosts the second largest orogenic plateau in the world, the Altiplano-Puna plateau. The Andes are known as a non-collisional subduction-type orogen which developed as a result of the interaction between the subducted oceanic Nazca plate and the South American continental plate. The different Andean segments exhibit along-strike variations of morphotectonic provinces characterized by different elevations, volcanic activity, deformation styles, crustal thickness, shortening magnitude and oceanic plate geometry. Most of the present-day elevation can be explained by crustal shortening in the last ~50 Ma, with the shortening magnitude decreasing from ~300 km in the central (15°S-30°S) segment to less than half that in the southern part (30°S-40°S). Several factors were proposed that might control the magnitude and acceleration of shortening of the Central Andes in the last 15 Ma. One important factor is likely the slab geometry. At 27-33°S, the slab dips horizontally at ~100 km depth due to the subduction of the buoyant Juan Fernandez Ridge, forming the Pampean flat-slab. This horizontal subduction is thought to influence the thermo-mechanical state of the Sierras Pampeanas foreland, for instance, by strengthening the lithosphere and promoting the thick-skinned propagation of deformation to the east, resulting in the uplift of the Sierras Pampeanas basement blocks. The flat-slab has migrated southwards from the Altiplano latitude at ~30 Ma to its present-day position and the processes and consequences associated to its passage on the contemporaneous acceleration of the shortening rate in Central Andes remain unclear. Although the passage of the flat-slab could offer an explanation to the acceleration of the shortening, the timing does not explain the two pulses of shortening at about 15 Ma and 4 Ma that are suggested from geological observations. I hypothesize that deformation in the Central Andes is controlled by a complex interaction between the subduction dynamics of the Nazca plate and the dynamic strengthening and weakening of the South American plate due to several upper plate processes. To test this hypothesis, a detailed investigation into the role of the flat-slab, the structural inheritance of the continental plate, and the subduction dynamics in the Andes is needed. Therefore, I have built two classes of numerical thermo-mechanical models: (i) The first class of models are a series of generic E-W-oriented high-resolution 2D subduction models thatinclude flat subduction in order to investigate the role of the subduction dynamics on the temporal variability of the shortening rate in the Central Andes at Altiplano latitudes (~21°S). The shortening rate from the models was then validated with the observed tectonic shortening rate in the Central Andes. (ii) The second class of models are a series of 3D data-driven models of the present-day Pampean flat-slab configuration and the Sierras Pampeanas (26-42°S). The models aim to investigate the relative contribution of the present-day flat subduction and inherited structures in the continental lithosphere on the strain localization. Both model classes were built using the advanced finite element geodynamic code ASPECT.
The first main finding of this work is to suggest that the temporal variability of shortening in the Central Andes is primarily controlled by the subduction dynamics of the Nazca plate while it penetrates into the mantle transition zone. These dynamics depends on the westward velocity of the South American plate that provides the main crustal shortening force to the Andes and forces the trench to retreat. When the subducting plate reaches the lower mantle, it buckles on it-self until the forced trench retreat causes the slab to steepen in the upper mantle in contrast with the classical slab-anchoring model. The steepening of the slab hinders the trench causing it to resist the advancing South American plate, resulting in the pulsatile shortening. This buckling and steepening subduction regime could have been initiated because of the overall decrease in the westwards velocity of the South American plate. In addition, the passage of the flat-slab is required to promote the shortening of the continental plate because flat subduction scrapes the mantle lithosphere, thus weakening the continental plate. This process contributes to the efficient shortening when the trench is hindered, followed by mantle lithosphere delamination at ~20 Ma. Finally, the underthrusting of the Brazilian cratonic shield beneath the orogen occurs at ~11 Ma due to the mechanical weakening of the thick sediments covered the shield margin, and due to the decreasing resistance of the weakened lithosphere of the orogen.
The second main finding of this work is to suggest that the cold flat-slab strengthens the overriding continental lithosphere and prevents strain localization. Therefore, the deformation is transmitted to the eastern front of the flat-slab segment by the shear stress operating at the subduction interface, thus the flat-slab acts like an indenter that “bulldozes” the mantle-keel of the continental lithosphere. The offset in the propagation of deformation to the east between the flat and steeper slab segments in the south causes the formation of a transpressive dextral shear zone. Here, inherited faults of past tectonic events are reactivated and further localize the deformation in an en-echelon strike-slip shear zone, through a mechanism that I refer to as “flat-slab conveyor”. Specifically, the shallowing of the flat-slab causes the lateral deformation, which explains the timing of multiple geological events preceding the arrival of the flat-slab at 33°S. These include the onset of the compression and of the transition between thin to thick-skinned deformation styles resulting from the crustal contraction of the crust in the Sierras Pampeanas some 10 and 6 Myr before the Juan Fernandez Ridge collision at that latitude, respectively.
The deformation style of mountain belts is greatly influenced by the upper plate architecture created during preceding deformation phases. The Mesozoic Salta Rift extensional phase has created a dominant structural and lithological framework that controls Cenozoic deformation and exhumation patterns in the Central Andes. Studying the nature of these pre-existing anisotropies is a key to understanding the spatiotemporal distribution of exhumation and its controlling factors. The Eastern Cordillera in particular, has a structural grain that is in part controlled by Salta Rift structures and their orientation relative to Andean shortening. As a result, there are areas in which Andean deformation prevails and areas where the influence of the Salta Rift is the main control on deformation patterns.
Between 23 and 24°S, lithological and structural heterogeneities imposed by the Lomas de Olmedo sub-basin (Salta Rift basin) affect the development of the Eastern Cordillera fold-and-thrust belt. The inverted northern margin of the sub-basin now forms the southern boundary of the intermontane Cianzo basin. The former western margin of the sub-basin is located at the confluence of the Subandean Zone, the Santa Barbara System and the Eastern Cordillera. Here, the Salta Rift basin architecture is responsible for the distribution of these morphotectonic provinces. In this study we use a multi-method approach consisting of low-temperature (U-Th-Sm)/He and apatite fission track thermochronology, detrital geochronology, structural and sedimentological analyses to investigate the Mesozoic structural inheritance of the Lomas de Olmedo sub-basin and Cenozoic exhumation patterns.
Characterization of the extension-related Tacurú Group as an intermediate succession between Paleozoic basement and the syn-rift infill of the Lomas de Olmedo sub-basin reveals a Jurassic maximum depositional age. Zircon (U-Th-Sm)/He cooling ages record a pre-Cretaceous onset of exhumation for the rift shoulders in the northern part of the sub-basin, whereas the western shoulder shows a more recent onset (140–115 Ma). Variations in the sedimentary thickness of syn- and post-rift strata document the evolution of accommodation space in the sub-basin. While the thickness of syn-rift strata increases rapidly toward the northern basin margin, the post-rift strata thickness decreases toward the margin and forms a condensed section on the rift shoulder.
Inversion of Salta Rift structures commenced between the late Oligocene and Miocene (24–15 Ma) in the ranges surrounding the Cianzo basin. The eastern and western limbs of the Cianzo syncline, located in the hanging wall of the basin-bounding Hornocal fault, show diachronous exhumation. At the same time, western fault blocks of Tilcara Range, south of the Cianzo basin, began exhuming in the late Oligocene to early Miocene (26–16 Ma). Eastward propagation to the frontal thrust and to the Paleozoic strata east of the Tilcara Range occurred in the middle Miocene (22–10 Ma) and the late Miocene–early Pliocene (10–4 Ma), respectively.
Mountain ranges can fundamentally influence the physical and and chemical processes that shape Earths’ surface. With elevations of up to several kilometers they create climatic enclaves by interacting with atmospheric circulation and hydrologic systems, thus leading to a specific distribution of flora and fauna. As a result, the interiors of many Cenozoic mountain ranges are characterized by an arid climate, internally drained and sediment-filled basins, as well as unique ecosystems that are isolated from the adjacent humid, low-elevation regions along their flanks and forelands. These high-altitude interiors of orogens are often characterized by low relief and coalesced sedimentary basins, commonly referred to as plateaus, tectono-geomorphic entities that result from the complex interactions between mantle-driven geological and tectonic conditions and superposed atmospheric and hydrological processes. The efficiency of these processes and the fate of orogenic plateaus is therefore closely tied to the balance of constructive and destructive processes – tectonic uplift and erosion, respectively. In numerous geological studies it has been shown that mountain ranges are delicate systems that can be obliterated by an imbalance of these underlying forces. As such, Cenozoic mountain ranges might not persist on long geological timescales and will be destroyed by erosion or tectonic collapse. Advancing headward erosion of river systems that drain the flanks of the orogen may ultimately sever the internal drainage conditions and the maintenance of storage of sediments within the plateau, leading to destruction of plateau morphology and connectivity with the foreland. Orogenic collapse may be associated with the changeover from a compressional stress field with regional shortening and topographic growth, to a tensional stress field with regional extensional deformation and ensuing incision of the plateau. While the latter case is well-expressed by active extensional faults in the interior parts of the Tibetan Plateau and the Himalaya, for example, the former has been attributed to have breached the internally drained areas of the high-elevation sectors of the Iranian Plateau.
In the case of the Andes of South America and their internally drained Altiplano-Puna Plateau, signs of both processes have been previously described. However, in the orogenic collapse scenario the nature of the extensional structures had been primarily investigated in the northern and southern terminations of the plateau; in some cases, the extensional faults were even regarded to be inactive. After a shallow earthquake in 2020 within the Eastern Cordillera of Argentina that was associated with extensional deformation, the state of active deformation and the character of the stress field in the central parts of the plateau received renewed interest to explain a series of extensional structures in the northernmost sectors of the plateau in north-western Argentina. This study addresses (1) the issue of tectonic orogenic collapse of the Andes and the destruction of plateau morphology by studying the fill and erosion history of the central eastern Andean Plateau using sedimentological and geochronological data and (2) the kinematics, timing and magnitude of extensional structures that form well-expressed fault scarps in sediments of the regional San Juan del Oro surface, which is an integral part of the Andean Plateau and adjacent morphotectonic provinces to the east.
Importantly, sediment properties and depositional ages document that the San Juan del Oro Surface was not part of the internally-drained Andean Plateau, but rather associated with a foreland-directed drainage system, which was modified by the Andean orogeny and that became successively incorporated into the orogen by the eastward-migration of the Andean deformation front during late Miocene – Pliocene time. Structural and geomorphic observations within the plateau indicate that extensional processes must have been repeatedly active between the late Miocene and Holocene supporting the notion of plateau-wide extensional processes, potentially associated with Mw ~ 7 earthquakes. The close relationship between extensional joints and fault orientations underscores that 3 was oriented horizontally in NW-SE direction and 1 was vertical. This unambiguously documents that the observed deformation is related to gravitational forces that drive the orogenic collapse of the plateau. Applied geochronological analyses suggest that normal faulting in the northern Puna was active at about 3 Ma, based on paired cosmogenic nuclide dating of sediment fill units. Possibly due to regional normal faulting the drainage system within the plateau was modified, promoting fluvial incision.