TY - JOUR A1 - Huck, Stefan A1 - Wohlwend, Stephan A1 - Coimbra, Rute A1 - Christ, Nicolas A1 - Weissert, Helmut T1 - Disentangling shallow-water bulk carbonate carbon isotope archives with evidence for multi-stage diagenesis BT - an in-depth component-specific petrographic and geochemical study from Oman (mid-Cretaceous) JF - The depositional record N2 - Disentangling shallow‐water bulk carbonate carbon isotope archives into primary and diagenetic components is a notoriously difficult task and even diagenetically screened records often provide chemostratigraphic patterns that significantly differ from global signals. This is mainly caused by the polygenetic nature of shallow‐water carbonate substrates, local carbon cycle processes causing considerable neritic–pelagic isotope gradients and the presence of hiatal surfaces resulting in extremely low carbonate preservation rates. Provided here is an in‐depth petrographic and geochemical evaluation of different carbonate phases of a mid‐Cretaceous (Barremian–Aptian) shallow‐water limestone succession (Jabal Madar section) deposited on the tropical Arabian carbonate platform in Oman. The superposition of stable isotope signatures of identified carbonate phases causes a complex and often noisy bulk carbon isotope pattern. Blocky sparite cements filling intergranular pores and bioclastic voids evidence intermediate to (arguably) deep burial diagenetic conditions during their formation, owing to different timing or differential faulting promoting the circulation of fluids from variable sources. In contrast, sparite cements filling sub‐vertical veins reveal a rock‐buffered diagenetic fluid composition with an intriguing moderate enrichment in 13C, probably due to fractionation during pressure release in the context of the Miocene exhumation of the carbonate platform under study. The presence of abundant, replacive dedolomite in mud‐supported limestone samples forced negative carbon and oxygen isotope changes that are either associated with the thermal breakdown of organic matter in the deep burial realm or the expulsion of buried meteoric water in the intermediate burial realm. Notwithstanding the documented stratigraphically variable and often facies‐related impact of different diagenetic fluids on the bulk‐rock stable isotope signature, the identification of diagenetic end‐members defined δ13C and δ18O threshold values that allowed the most reliable ‘primary’ bulk carbon isotope signatures to be extracted. Most importantly, this approach exemplifies how to place regional shallow‐water stable isotope patterns with evidence for a complex multi‐stage diagenetic history into a supraregional or even global context. KW - Arabian carbonate platform KW - Barremian-Aptian KW - multi-stage diagenesis KW - shallow-water chemostratigraphy Y1 - 2017 U6 - https://doi.org/10.1002/dep2.35 SN - 2055-4877 VL - 3 SP - 233 EP - 257 PB - Wiley CY - Hoboken ER - TY - JOUR A1 - Wilson, Peter A1 - Huhtamies, Mikko A1 - Huck, Stephan A1 - Gahlen, Gundula A1 - Herrmann, Michael A1 - Reimer, Torsten F. A1 - Winnige, Norbert A1 - Pöhlmann, Markus A1 - Pauser, Josef A1 - Fuchs, Antje A1 - Möbius, Sascha A1 - Heil, Wolfgang A1 - Jacobs, Rainer A1 - Kaiser, Michael A1 - Kroll, Stefan A1 - Blank, Ralf A1 - Gründel, Olaf A1 - Schlürmann, Jan A1 - Geffarth, Renko A1 - Bavendamm, Gundula T1 - Militär und Gesellschaft in der Frühen Neuzeit N2 - Aus dem Inhalt dieser Ausgabe: BEITRÄGE: Peter H. Wilson: British and american perspectives on early modern warfare Mikko Huhtamies: Kriegswesen und Gesellschaft in der frühen Neuzeit in der finnisch-schwedischen Geschichtsforschung INTERNET: Stephan Huck: Nutzungsmöglichkeiten des Internets Gundula Gahlen , Michael Herrmann, Torsten F. Reimer und Norbert Winnige: Militärgeschichte der Frühen Neuzeit im Internet Die Online-Angebote des AMG und sfn Markus Pöhlmann: Die Internetpräsenz des Arbeitskreises Militärgeschichte e.V. Josef Pauser: Das Online-Angebot des Arbeitskreises .Policey/Polizei im vormodernen Europa. Torsten F. Reimer: Eine Studie in Kriegführung. Eine Vorstellung des H-War Military History Network PROJEKTE: Antje Fuchs: Ein neuer Konfessionskrieg? Erfahrungen von Krieg und Okkupation im Kurfürstentum Hannover und benachbarten geistlichen Fürstentümern zur Zeit des Siebenjährigen Krieges 1756-1763 Sascha Möbius: Ergebnisse der Magisterarbeit .Psychologische Aspekte friederizianischer Taktik im Siebenjährigen Krieg. Wolfgang Heil: Die Gemeinen Soldaten. Das Sozialleben der militärischen Unterschicht im altpreußischen Heer und seine Stellung in der altständischen Gesellschaft. Rainer Jacobs: Militärische Dienstpflichten in der Frühen Neuzeit Michael Kaiser und Stefan Kroll: Forschungsprojekt Militär und Religiosität in der Frühen Neuzeit Ralf Blank: Die Schlosskanonen von Hohenlimburg Artilleriegeschütze mit einer wechselvollen Geschichte Gundula Gahlen und Olaf Gründel: Kataster zur Schlacht bei Wittstock von 1636 Jan Schlürmann: Die Schleswig-Holstein-Gottorfischen Auxiliairtruppen im Spanischen Erbfolgekrieg . Ergebnisse einer Untersuchung BERICHTE: Renko Geffarth: Die besetzte res publica. Zum Verhältnis von ziviler Obrigkeit und militärischer Herrschaft in besetzten Gebieten vom Spätmittelalter bis zum 18. Jahrhundert. Gundula Bavendamm: Operationsgeschichte und moderne Historiographie. Ein Widerspruch? T3 - Militär und Gesellschaft in der frühen Neuzeit - 5, Heft 2 KW - Militär / Geschichte Y1 - 2001 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-28126 SN - 1617-9722 SN - 1861-910X VL - 5 IS - 2 ER - TY - JOUR A1 - Huck, Stefan A1 - Stein, Melody A1 - Immenhauser, Adrian A1 - Skelton, Peter W. A1 - Christ, Nicolas A1 - Foellmi, Karl B. A1 - Heimhofer, Ulrich T1 - Response of proto-North Atlantic carbonate-platform ecosystems to OAE1a-related stressors JF - Sedimentary geology : international journal of applied and regional sedimentology N2 - Integrated biostratigraphic-chemostratigraphic studies provide evidence that the proto-North Atlantic realm witnessed major changes in carbonate platform production in the run-up of the Early Aptian oceanic anoxic event (OAE) 1a. Whereas pervasive growth of Lithocodium microencrusters represents an early harbinger of OAE1a-related environmental perturbation, the subsequent replacement of oligotrophic rudist-coral-nerineid by mesotrophic orbitolinid-oyster communities was clearly associated with the event itself. In order to test the supra-regional relevance of this major community replacement, two shallow-water sections in the southern Lusitanian Basin (Portugal) are investigated by means of geochemistry (carbon and oxygen isotopes), cement petrography and detailed sedimentological analysis. The focus is on a regional, prominent discontinuity surface (S4) at the transition between oligotrophic and mesotrophic carbonate platform production, which might indicate that the major biotic change could have been associated with a phase of non-sedimentation and possibly erosion. The studied sections (Sao Julia, Crismina) provide evidence that the major Early Aptian biotic turnover was preceded by numerous subordinate but significant changes in platform ecology, which mirrored a series of progressive short-term environmental changes in the course of OAE1. Several transient mass occurrences of orbitolinids indicate repeated phases of ecological stress arguably due to enhanced nutrient input and deepening. Small-scale sea-level changes at parasequence level below the major discontinuity surface are revealed by alternations of rudist assemblages dominated by clinger or recumbent forms as well as intercalated hardground and subaerial exposure stages. Expanded phases of subaerial exposure, however, can be largely ruled out following the geochemical and cement-petrographic data presented here. Enhanced continent-derived siliciclastic input characterising the lower orbitolinid-oyster dominated limestones is in support of a shift to more humid conditions during the middle Early Aptian. This is in line with palaeoclimatic data, which propose a southward movement of the mid-latitude arid climate belt during this time. The documented rapid replacement of oligotrophic assemblages by various environmental-stress adapted carbonate platform communities might be seen as explanation for ongoing Early Aptian proto-North Atlantic carbonate production during a time of widespread platform demise and drowning in the northern Tethyan realm. (C) 2014 Elsevier B.V. All rights reserved. KW - Aptian KW - Oceanic anoxic event 1a KW - Proto-North Atlantic KW - Discontinuity surfaces KW - Carbonate platform response KW - Carbon and oxygen isotopes Y1 - 2014 U6 - https://doi.org/10.1016/j.sedgeo.2014.08.003 SN - 0037-0738 SN - 1879-0968 VL - 313 SP - 15 EP - 31 PB - Elsevier CY - Amsterdam ER -