TY  - JOUR
A1  - Krmíček, Lukáš
A1  - Timmerman, Martin Jan
A1  - Ziemann, Martin Andreas
A1  - Sudo, Masafumi
A1  - Ulrych, Jaromir
T1  - 40Ar/39Ar step-heating dating of phlogopite and kaersutite megacrysts from the Železná hůrka (Eisenbühl) Pleistocene scoria cone, Czech Republic
JF  - Geologica Carpathica
N2  - (40)A/Ar-39 step-heating of mica and amphibole megacrysts from hauyne-bearing olivine melilitite scoria/tephra from the Zelezna hurka yielded a 435 +/- 108 ka isotope correlation age for phlogopite and a more imprecise 1.55 Ma total gas age of the kaersutite megacryst. The amphibole megacrysts may constitute the first, and the younger phlogopite megacrysts the later phase of mafic, hydrous melilitic magma crystallization. It cannot be ruled out that the amphibole megacrysts are petrogenetically unrelated to tephra and phlogopite megacrysts and were derived from mantle xenoliths or disaggregated older, deep crustal pegmatites. This is in line both with the rarity of amphibole at Zelezna hurka and with the observed signs of magmatic resorption at the edges of amphibole crystals.
KW  - Bohemian Massif
KW  - Zelezna hurka
KW  - Eisenbuhl
KW  - argon dating
KW  - mica
KW  - amphibole
KW  - melilitite
Y1  - 2020
U6  - https://doi.org/10.31577/GeolCarp.71.4.6
SN  - 1335-0552
SN  - 1336-8052
VL  - 71
IS  - 4
SP  - 382
EP  - 387
PB  - Veda
CY  - Bratislava
ER  - 
TY  - JOUR
A1  - Ziemann, Martin Andreas
A1  - Madariaga, Juan Manuel
T1  - Applications of Raman spectroscopy in art and archaeology
JF  - Journal of Raman spectroscopy
N2  - The 10th edition of the International Congress on the Application of Raman Spectroscopy in Art and Archaeology (RAA2019) was held in Potsdam (Germany) from 3 to 7 September 2019, with eight keynote lectures, 35 oral presentations and 18 Poster Presentations. The number of active participants was 68 delegates from 20 countries among the 236 authors that presented at least one work.
Y1  - 2020
U6  - https://doi.org/10.1002/jrs.6054
SN  - 0377-0486
SN  - 1097-4555
VL  - 52
IS  - 1
SP  - 8
EP  - 14
PB  - Wiley
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Kaeter, David
A1  - Ziemann, Martin Andreas
A1  - Böttger, Ute
A1  - Weber, Iris
A1  - Hecht, Lutz
A1  - Voropaev, Sergey A.
A1  - Korochantsev, Alexander V.
A1  - Kocherov, Andrey V.
T1  - The Chelyabinsk meteorite
BT  - new insights from a comprehensive electron microscopy and Raman spectroscopy study with evidence for graphite in olivine of ordinary chondrites
JF  - Meteoritics & planetary science : journal of the Meteoritical Society
N2  - We present results of petrographic, mineralogical, and chemical investigations of three Chelyabinsk meteorite fragments. Three distinct lithologies were identified: light S3LL5, dark S4-S5LL5 material, and opaque fine-grained former impact melt. Olivine-spinel thermometry revealed an equilibration temperature of 703 +/- 23 degrees C for the light lithology. All plagioclase seems to be secondary, showing neither shock-induced fractures nor sulfide-metal veinlets. Feldspathic glass can be observed showing features of extensive melting and, in the dark lithology, as maskelynite, lacking melt features and retaining grain boundaries of former plagioclase. Olivine of the dark lithology shows planar deformation features. Impact melt is dominated by Mg-rich olivine and resembles whole-rock melt. Melt veins (<2mm) are connected to narrower veinlets. Melt vein textures are similar to pegmatite textures showing chilled margins, a zone of inward-grown elongated crystals and central vugs, suggesting crystallization from supercooled melt. Sulfide-metal droplets indicate liquid immiscibility of both silicate and sulfide as well as sulfide and metal melts. Impact melting may have been an important factor for differentiation of primitive planetary bodies. Graphite associated with micrometer-sized melt inclusions in primary olivine was detected by Raman mapping. Carbon isotopic studies of graphite could be applied to test a possible presolar origin.
Y1  - 2017
U6  - https://doi.org/10.1111/maps.13027
SN  - 1086-9379
SN  - 1945-5100
VL  - 53
IS  - 3
SP  - 416
EP  - 432
PB  - Wiley
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Borghini, Alessia
A1  - Ferrero, Silvio
A1  - O’Brien, Patrick J.
A1  - Laurent, Oscar
A1  - Günter, Christina
A1  - Ziemann, Martin Andreas
T1  - Cryptic metasomatic agent measured in situ in Variscan mantle rocks
BT  - Melt inclusions in garnet of eclogite, Granulitgebirge, Germany
N2  - Garnet of eclogite (formerly termed garnet clinopyroxenite) hosted in lenses of orogenic garnet peridotite from the Granulitgebirge, NW Bohemian Massif, contains unique inclusions of granitic melt, now either glassy or crystallized. Analysed glasses and re‐homogenized inclusions are hydrous, peraluminous, and enriched in highly incompatible elements characteristic of the continental crust such as Cs, Li, B, Pb, Rb, Th, and U. The original melt thus represents a pristine, chemically evolved metasomatic agent, which infiltrated the mantle via deep continental subduction during the Variscan orogeny. The bulk chemical composition of the studied eclogites is similar to that of Fe‐rich basalt and the enrichment in LILE and U suggest a subduction‐related component. All these geochemical features confirm metasomatism. In comparison with many other garnet+clinopyroxene‐bearing lenses in peridotites of the Bohemian Massif, the studied samples from Rubinberg and Klatschmühle are more akin to eclogite than pyroxenites, as reflected in high jadeite content in clinopyroxene, relatively low Mg, Cr, and Ni but relatively high Ti. However, trace elements of both bulk rock and individual mineral phases show also important differences making these samples rather unique. Metasomatism involving a melt requiring a trace element pattern very similar to the composition reported here has been suggested for the source region of rocks of the so‐called durbachite suite, that is, ultrapotassic melanosyenites, which are found throughout the high‐grade Variscan basement. Moreover, the Th, U, Pb, Nb, Ta, and Ti patterns of these newly studied melt inclusions (MI) strongly resemble those observed for peridotite and its enclosed pyroxenite from the T‐7 borehole (Staré, České Středhoři Mountains) in N Bohemia. This suggests that a similar kind of crustal‐derived melt also occurred here. This study of granitic MI in eclogites from peridotites has provided the first direct characterization of a preserved metasomatic melt, possibly responsible for the metasomatism of several parts of the mantle in the Variscides.
KW  - clinopyroxenite
KW  - eclogite
KW  - melt inclusions
KW  - metasomatism
KW  - orogenic peridotite
Y1  - 2019
U6  - https://doi.org/10.1111/jmg.12519
SN  - 1525-1314
SN  - 0263-4929
VL  - 38
SP  - 207
EP  - 234
PB  - Wiley-Blackwell
CY  - Oxford [u.a.]
ER  - 
TY  - JOUR
A1  - Ferrero, Silvio
A1  - Borghini, Alessia
A1  - Wunder, Bernd
A1  - Walle, Markus
A1  - Günter, Christina
A1  - Ziemann, Martin Andreas
T1  - A treasure chest full of nanogranitoids
BT  - an archive to investigate crustal melting in the Bohemian Massif
JF  - Metamorphic Geology: Microscale to Mountain Belts
N2  - The central European Bohemian Massif has undergone over two centuries of scientific investigation which has made it a pivotal area for the development and testing of modern geological theories. The discovery of melt inclusions in high-grade rocks, either crystallized as nanogranitoids or as glassy inclusions, prompted the re-evaluation of the area with an ‘inclusionist’ eye. Melt inclusions have been identified in a wide range of rocks, including felsic/perpotassic granulites, migmatites, eclogites and garnet clinopyroxenites, all the result of melting events albeit over a wide range of pressure/temperature conditions (800–1000°C/0.5–5 GPa). This contribution provides an overview of such inclusions and discusses the qualitative and quantitative constraints they provide for melting processes, and the nature of melts and fluids involved in these processes. In particular, data on trace-element signatures of melt inclusions trapped at mantle depths are presented and discussed. Moreover, experimental re-homogenization of nanogranitoids provided microstructural criteria allowing assessment of the conditions at which melt and host are mutually stable during melting. Overall this work aims to provide guidelines and suggestions for petrologists wishing to explore the fascinating field of melt inclusions in metamorphic terranes worldwide, based on the newest discoveries from the still-enigmatic Bohemian Massif.
Y1  - 2018
SN  - 978-1-78620-400-4
U6  - https://doi.org/10.1144/SP478.19
SN  - 0305-8719
VL  - 478
SP  - 13
EP  - 38
PB  - Geological Soc Publishing House
CY  - Bath
ER  - 
TY  - JOUR
A1  - Borghini, Alessia
A1  - Ferrero, Silvio
A1  - Wunder, Bernd
A1  - Laurent, Oscar
A1  - Ziemann, Martin Andreas
T1  - Granitoid melt inclusions in orogenic peridotite and the origin of garnet clinopyroxenite
JF  - Geology
N2  - Granitic melt inclusions were found in layers of garnet clinopyroxenites from orogenic peridotites hosted in high-pressure felsic granulites of the Granulitgebirge, central Europe. The inclusions are both glassy and crystallized, and occur as clusters in the garnet. Microstructural features suggest that the inclusions formed while garnet was growing as a peritectic phase, likely alongside clinopyroxene. The chemistry of the melt, in particular its trace element signature, shows a crustal contribution, probably due to the involvement of phengite in the melt-producing reaction, most likely in the presence of a fluid. The presence of a granitoid melt in mantle rocks may be the result of localized melting of a phengite-bearing protolith either already present in the peridotites or, more likely, within the local deeply subducted crustal units. In the latter case, the melt would have infiltrated the peridotites and generated pyroxenite via metasomatism. In either case, the presence of granitoid inclusions in orogenic peridotite provides direct evidence for a genetic connection between a high-pressure crustal melt and garnet pyroxenites. The in situ characterization of these remnants of natural melt provides direct quantitative constraints on (one of) the agents responsible for the interaction between crust and mantle.
Y1  - 2018
U6  - https://doi.org/10.1130/G45316.1
SN  - 0091-7613
SN  - 1943-2682
VL  - 46
IS  - 11
SP  - 1007
EP  - 1010
PB  - American Institute of Physics
CY  - Boulder
ER  - 
TY  - JOUR
A1  - Ziemann, Martin Andreas
T1  - In situ micro-Raman spectroscopy on minerals on-site in the Grotto Hall of the New Palace, Park Sanssouci, in Potsdam
JF  - Journal of Raman spectroscopy : JRS
N2  - Questions of identity and provenance of minerals that are parts of masterpieces in museums have become increasingly important in mineralogical and historical studies. Detailed investigations of valuable and unique objects require on-site, nondestructive and noninvasive methods because touching or removing them may cause irreparable damage. A mobile Raman-microprobe has been used to meet these demands for truly in situ mineralogical studies of the large collection of minerals and rocks of the Prussian kings in the Grotto Hall (Grottensaal) of the New Palace (Neues Palais), Park Sanssouci in Potsdam. Minerals on the walls of the Grotto Hall were analyzed to identify them and thereby to complete the data bank of the collection. Fluid and solid inclusions in the interior of a large quartz crystal have been studied to provide evidence of the provenance of the crystal. The fluid inclusions contain aqueous saline solutions, whereas the solid inclusions are needles of anhydrite with a length of about 1.5 mm. The quartz probably originated from an area in the eastern Alps, from the surroundings of Bad Gastein, Austria. This is the first on-site and in situ study of inclusions below the surface of a mineral with a mobile Raman-microprobe outside a laboratory.
KW  - mobile Raman-microprobe
KW  - minerals
KW  - provenance
KW  - fluid inclusions
KW  - anhydrite inclusions
Y1  - 2006
U6  - https://doi.org/10.1002/jrs.1584
SN  - 0377-0486
VL  - 37
IS  - 10
SP  - 1019
EP  - 1025
PB  - Wiley
CY  - Chichester
ER  - 
TY  - JOUR
A1  - Ferrero, Silvio
A1  - Ziemann, Martin Andreas
A1  - Angel, Ross J.
A1  - Wunder, Bernd
T1  - Kumdykolite, kokchetavite, and cristobalite crystallized in nanogranites from felsic granulites, Orlica-Snieznik Dome (Bohemian Massif): not evidence for ultrahigh-pressure conditions
JF  - Contributions to mineralogy and petrology
N2  - A unique assemblage including kumdykolite and kokchetavite, polymorphs of albite and K-feldspar, respectively, together with cristobalite, micas, and calcite has been identified in high-pressure granulites of the Orlica-Snieznik dome (Bohemian Massif) as the product of partial melt crystallization in preserved nanogranites. Previous reports of both kumdykolite and kokchetavite in natural rocks are mainly from samples that passed through the diamond stability field. However, because the maximum pressure recorded in these host rocks is <3 GPa, our observations indicate that high pressure is not required for the formation of kumdykolite and kokchetavite, and their presence is not therefore an indicator of ultrahigh-pressure conditions. Detailed microstructural and microchemical investigation of these inclusions indicates that such phases should instead be regarded as (1) a direct mineralogical criteria to identify former melt inclusions with preserved original compositions, including H2O and CO2 contents and (2) indicators of rapid cooling of the host rocks. Thus, the present study provides novel criteria for the interpretation of melt inclusions in natural rocks and allows a more rigorous characterization of partial melts during deep subduction to mantle depth as well as their behavior on exhumation.
KW  - Partial melt
KW  - Polymorphs
KW  - Deep fluids
KW  - Nanogranites
KW  - Kumdykolite
KW  - Kokchetavite
KW  - Cristobalite
Y1  - 2016
U6  - https://doi.org/10.1007/s00410-015-1220-x
SN  - 0010-7999
SN  - 1432-0967
VL  - 171
SP  - 61
EP  - 65
PB  - Springer
CY  - New York
ER  - 
TY  - JOUR
A1  - Schmidt, Birgit Angelika
A1  - Ziemann, Martin Andreas
A1  - Pentzien, Simone
A1  - Gabsch, Toralf
A1  - Koch, Werner
A1  - Krüger, Jörg
T1  - Technical analysis of a Central Asian wall painting detached from a Buddhist cave temple on the northern Silk Road
JF  - Studies in Conservation
N2  - A great number of Central Asian wall paintings, archeological materials, architectural fragments, and textiles, as well as painting fragments on silk and paper, make up the so called Turfan Collection at the Asian Art Museum in Berlin. The largest part of the collection comes from the Kucha region, a very important cultural center in the third to ninth centuries. Between 1902 and 1914, four German expeditions traveled along the northern Silk Road. During these expeditions, wall paintings were detached from their original settings in Buddhist cave complexes. This paper reports a technical study of a wall painting, existing in eight fragments, from the Buddhist cave no. 40 (Ritterhohle). Its original painted surface is soot blackened and largely illegible. Gruwedel, leader of the first and third expeditions, described the almost complete destruction of the rediscovered temple complex and evidence of fire damage. The aim of this case study is to identify the materials used for the wall paintings. Furthermore, soot deposits as well as materials from conservation interventions were of interest. Non-invasive analyses were preferred but a limited number of samples were taken to provide more precise information on the painting technique. By employing optical and scanning electron microscopy, energy dispersive X-ray spectroscopy, micro X-ray fluorescence spectroscopy, X-ray diffraction analysis, and Raman spectroscopy, a layer sequence of earthen render, a ground layer made of gypsum, and a paint layer containing a variety of inorganic pigments were identified.
KW  - Wall paintings
KW  - Central Asia
KW  - Silk Road
KW  - Pigments
KW  - Microscopy
KW  - EDX
KW  - XRF
KW  - Raman spectroscopy
Y1  - 2016
U6  - https://doi.org/10.1179/2047058414Y.0000000152
SN  - 0039-3630
SN  - 2047-0584
VL  - 61
SP  - 113
EP  - 122
PB  - Routledge, Taylor & Francis Group
CY  - Abingdon
ER  - 
TY  - GEN
A1  - Voropaev, S.
A1  - Korochantsev, A.
A1  - Petukhov, D.
A1  - Kocherov, A.
A1  - Kaeter, David
A1  - Ziemann, Martin Andreas
A1  - Boettger, Ute
T1  - Ordinary chondrites of Chelyabinsk meteorite and comparison with asteroid 25143 (Itokawa)
T2  - PLoS one
Y1  - 2016
SN  - 1086-9379
SN  - 1945-5100
VL  - 51
SP  - A644
EP  - A644
PB  - Wiley-Blackwell
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Ferrero, Silvio
A1  - Wunder, Bernd
A1  - Ziemann, Martin Andreas
A1  - Waelle, Markus
T1  - Carbonatitic and granitic melts produced under conditions of primary
immiscibility during anatexis in the lower crust
JF  - Earth & planetary science letters
N2  - Carbonatites are peculiar magmatic rocks with mantle-related genesis, commonly interpreted as the products of melting of CO2-bearing peridotites, or resulting from the chemical evolution of mantle derived magmas, either through extreme "differentiation or secondary immiscibility. Here we report the first finding of anatectic carbonatites of crustal origin, preserved as calcite-rich polycrystalline inclusions in garnet from low-to-medium pressure migmatites of the Oberpfalz area, SW Bohemian Massif (Central Europe). These inclusions originally trapped a melt of calciocarbonatitic composition with a characteristic enrichment in Ba, Sr and LREE. This interpretation is supported by the results of a detailed microstructural and microchemical investigation, as well as re-melting experiments using a piston cylinder apparatus. Carbonatitic inclusions coexist in the same cluster with crystallized silicate melt inclusions (nanogranites) and COH fluid inclusions, suggesting conditions of primary immiscibility between two melts and a fluid during anatexis. The production of both carbonatitic and granitic melts during the same anatectic event requires a suitable heterogeneous protolith. This may be represented by a sedimentary sequence containing marble lenses of limited extension, similar to the one still visible in the adjacent central Moldanubian Zone. The presence of CO2-rich fluid inclusions suggests furthermore that high CO2 activity during anatexis may be required to stabilize a carbonate-rich melt in a silica-dominated, system. This natural occurrence displays a remarkable similarity with experiments on carbonate-silicate melt immiscibility, where CO2 saturation is a condition commonly imposed. In conclusion, this study shows how the investigation of partial melting through melt inclusion studies may unveil unexpected processes whose evidence, while preserved in stiff minerals such as garnet, is completely obliterated in the rest of the rock due to metamorphic re-equilibration. Our results thus provide invaluable new insights into the processes which shape the geochemical evolution of our planet, such as the redistribution of carbon and strategic metals during orogenesis. (C) 2016 Elsevier B.V. All rights reserved.
KW  - partial melting
KW  - carbonatites
KW  - nanogranites
KW  - garnet
KW  - melt inclusions;
 nanocarbonatites
Y1  - 2016
U6  - https://doi.org/10.1016/j.epsl.2016.08.043
SN  - 0012-821X
SN  - 1385-013X
VL  - 454
SP  - 121
EP  - 131
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Aygül, Mesut
A1  - Okay, Aral I.
A1  - Oberhänsli, Roland
A1  - Ziemann, Martin Andreas
T1  - Thermal structure of low-grade accreted Lower Cretaceous distal turbidites, the Central Pontides, Turkey: insights for tectonic thickening of an accretionary wedge
JF  - Turkish journal of earth sciences = Türk yerbilimleri dergisi
N2  - Albian-Turonian subduction-accretionary complexes are exposed widely in the Central Pontides. A major portion of the accretionary complexes is made up of a metaflysch sequence consisting of slate/phyllite and metasandstone intercalation with blocks of marble, Na-amphibole bearing metabasite, and serpentinite. The metaflysch sequence represents distal parts of a large Lower Cretaceous submarine turbidite fan deposited on the Laurasian active continental margin that was subsequently accreted and metamorphosed during the Albian. Raman spectra of carbonaceous material of the metapelitic rocks revealed that the metaflysch consists of metamorphic packets with distinct peak metamorphic temperatures. The majority of the metapelites are low-temperature (ca. 330 degrees C) slates characterized by lack of differentiation of the graphite (G) and D2 defect bands. They possibly represent offscraped distal turbidites along the toe of the Albian accretionary wedge. Other phyllites are characterized by a slightly pronounced G band with a D2 defect band occurring on its shoulder. Peak metamorphic temperatures of these phyllites are constrained to 370-385 degrees C. The phyllites are associated with a strip of incipient blueschist facies metabasites and are found as a sliver within the offscraped distal turbidites. We interpret the phyllites as underplated continental sediments together with oceanic crustal basalt along the basal decollement. Tectonic emplacement of the underplated rocks into the offscraped distal turbidites was possibly achieved by out-of-sequence thrusting causing tectonic thickening and uplift of the wedge.
KW  - Pontides
KW  - distal turbidites
KW  - offscraping
KW  - underplating
KW  - low-grade metamorphism
KW  - graphitization
KW  - Raman microspectroscopy
Y1  - 2015
U6  - https://doi.org/10.3906/yer-1504-4
SN  - 1300-0985
VL  - 24
IS  - 5
SP  - 461
EP  - 474
PB  - Tübitak
CY  - Ankara
ER  - 
TY  - JOUR
A1  - Ferrero, Silvio
A1  - Wunder, Bernd
A1  - Walczak, Katarzyna
A1  - Ziemann, Martin Andreas
T1  - Preserved near ultrahigh-pressure melt from continental crust subducted to mantle depths
JF  - Geology
N2  - Remnants of hydrous melt formed at mantle depths have been identified and characterized within high-pressure leucogranulites of the Orlica-Snieznik Dome (Bohemian Massif, central Europe). They occur as nanogranites in garnet formed via partial melting of granitoids during the Variscan orogeny. Melt composition and H2O content have been investigated in situ after experimental re-homogenization of the nanogranites, and are consistent with melts produced experimentally from crustal lithologies at mantle depths. This is the first geochemical study of melt inclusions from natural crustal rocks equilibrated close to the stability field of coesite, shedding light on how continental crust melts during deep subduction. Whereas decompressional melting is commonly invoked for deeply subducted crustal lithologies, melting occurred near or at the metamorphic peak pressure in the Orlica-Snieznik granulites. Melting of deeply subducted crustal rocks significantly modifies the rheology and thus promotes fast exhumation: this process has a critical influence on the geodynamic evolution of subduction-collision orogens as well as crustal differentiation at depth.
Y1  - 2015
U6  - https://doi.org/10.1130/G36534.1
SN  - 0091-7613
SN  - 1943-2682
VL  - 43
IS  - 5
SP  - 447
EP  - 450
PB  - American Institute of Physics
CY  - Boulder
ER  - 
TY  - JOUR
A1  - Wilke, Franziska Daniela Helena
A1  - Schmidt, Alexander
A1  - Ziemann, Martin Andreas
T1  - Subduction, peak and multi-stage exhumation metamorphism: Traces from one coesite-bearing eclogite, Tso Moran, western Himalaya
JF  - Lithos : an international journal of mineralogy, petrology, and geochemistry
N2  - Ultrahigh-pressure (UHP), coesite-bearing edogites in the Himalaya have been documented from the Kaghan Valley in Pakistan and the Tso Morani area in northwest India. These complexes are part of the northern edge of the Indian plate that has been subducted to, and metamorphosed at, mantle depths of more than 100 km before being exhumed. Both UHP complexes are located today directly adjacent to the Indus-Tsangpo suture zone and are not separated by non-metamorphosed sequences of Tethyan sediments from the Asian margin. Herein, we present new data for one fresh coesite-bearing eclogite from the Tso Moran massif. Therein, garnets are zoned reflecting their growth during prograde and peak metamorphism and showing a thin retrograde overgrowth. Inclusions can be directly correlated to the compositional zoning and are seen as either relicts of the protolith mineral paragenesis and as "snap shots" of the mineral paragenesis during subduction and under peak conditions. Rare earth element concentrations (REE) were obtained for garnet, mineral inclusions in garnet and matrix minerals. The REE pattern in garnet reflects a sequential change in matrix minerals and their proportions due to net transfer reactions during subduction and peak metamorphism. Using conventional geothermobarometry, a peak pressure of ca. 44-48 kbar at 560-760 degrees C followed by an S-shaped exhumation curve has been deduced. Gibbs free energy minimization modelling was used to supplement our analytical findings. (C) 2015 Elsevier B.V. All rights reserved.
KW  - Tso Morari
KW  - Coesite-bearing eclogite
KW  - Ultra-high pressure (UHP)
KW  - Rare earth element (REE) distribution
KW  - Laser ICP-MS
Y1  - 2015
U6  - https://doi.org/10.1016/j.lithos2015.06.007
SN  - 0024-4937
SN  - 1872-6143
VL  - 231
SP  - 77
EP  - 91
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Wiederkehr, Michael
A1  - Bousquet, Romain
A1  - Ziemann, Martin Andreas
A1  - Berger, Alfons
A1  - Schmid, Stefan M.
T1  - 3-D assessment of peak-metamorphic conditions by Raman spectroscopy of carbonaceous material an example from the margin of the Lepontine dome (Swiss Central Alps)
JF  - International journal of earth sciences
N2  - This study monitors regional changes in the crystallinity of carbonaceous matter (CM) by applying Micro-Raman spectroscopy to a total of 214 metasediment samples (largely so-called Bundnerschiefer) dominantly metamorphosed under blueschist- to amphibolite-facies conditions. They were collected within the northeastern margin of the Lepontine dome and easterly adjacent areas of the Swiss Central Alps. Three-dimensional mapping of isotemperature contours in map and profile views shows that the isotemperature contours associated with the Miocene Barrow-type Lepontine metamorphic event cut across refolded nappe contacts, both along and across strike within the northeastern margin of the Lepontine dome and adjacent areas. Further to the northeast, the isotemperature contours reflect temperatures reached during the Late Eocene subduction-related blueschist-facies event and/or during subsequent near-isothermal decompression; these contours appear folded by younger, large-scale post-nappe-stacking folds. A substantial jump in the recorded maximum temperatures across the tectonic contact between the frontal Adula nappe complex and surrounding metasediments indicates that this contact accommodated differential tectonic movement of the Adula nappe with respect to the enveloping Bundnerschiefer after maximum temperatures were reached within the northern Adula nappe, i.e. after Late Eocene time.
KW  - HP-metamorphism
KW  - Barrovian metamorphism
KW  - Graphitization
KW  - Metasediments
KW  - Micro-Raman spectroscopy
KW  - Central Alps
Y1  - 2011
U6  - https://doi.org/10.1007/s00531-010-0622-2
SN  - 1437-3254
VL  - 100
IS  - 5
SP  - 1029
EP  - 1063
PB  - Springer
CY  - New York
ER  - 
TY  - JOUR
A1  - Kotkova, Jana
A1  - O'Brien, Patrick J.
A1  - Ziemann, Martin Andreas
T1  - Diamond and coesite discovered in Saxony-type granulite solution to the Variscan garnet peridotite enigma
JF  - Geology
N2  - The pressures required for diamond and coesite formation far exceed conditions reached by even the deepest present-day orogenic crustal roots. Therefore the occurrence of metamorphosed continental crust containing these minerals requires processes other than crustal thickening to have operated in the past. Here we report the first in situ finding of diamond and coesite, characterized by micro-Raman spectroscopy, in high-pressure granulites otherwise indistinguishable from granulites found associated with garnet peridotite throughout the European Variscides. Our discovery confirms the provenance of Europe's first reliable diamond, the "Bohemian diamond," found in A.D. 1870, and also represents the first robust evidence for ultrahigh-pressure conditions in a major Variscan crustal rock type. A process of deep continental subduction is required to explain the metamorphic pressures and the granulite-garnet peridotite association, and thus tectonometamorphic models for these rocks involving a deep orogenic crustal root need to be significantly modified.
Y1  - 2011
U6  - https://doi.org/10.1130/G31971.1
SN  - 0091-7613
VL  - 39
IS  - 7
SP  - 667
EP  - 670
PB  - American Institute of Physics
CY  - Boulder
ER  - 
TY  - JOUR
A1  - Frijia, Gianluca
A1  - Di Lucia, Matteo
A1  - Vicedo, Vicent
A1  - Günter, Christina
A1  - Ziemann, Martin Andreas
A1  - Mutti, Maria
T1  - An extraordinary single-celled architect A multi-technique study of the agglutinated shell of the larger foraminifer Mesorbitolina from the Lower Cretaceous of southern Italy
JF  - Marine micropaleontology
N2  - Orbitolinids are larger foraminifera widespread in Lower Cretaceous shallow-water carbonates of the Tethyan realm. They are among the most important fossil groups used for Biostratigraphy. Despite this and although the structural features of the group have been described in detail, very little is known about the composition of their agglutinated test and the process by which they selected foreign grains. In this study, the test of Orbitolina d'Orbigny, 1850 (subgenus Mesorbitolina Schroeder, 1962) from Aptian shallow-water carbonate deposits of southern Italy has been studied in detail. We combine petrographic techniques (optical microscope and SEM) with energy-dispersive x-ray spectrometry (EDS), electron probe microanalyzer (EPMA), X-ray diffraction and Raman spectroscopy analyses.
 The results show that the test of Mesorbitolina is composed of carbonate and non-carbonate agglutinated grains with the latter distributed across the test with a specific pattern, moving from the marginal to the central zone. In the marginal zone, non-carbonate grains are found only in the epidermis and along the septa which are composed of quartz, with smaller amounts of illite/muscovite and K-feldspar grains. In the central zone of the test, non-carbonate grains are distributed in two ways. Coarse grains of quartz and K-feldspar are abundant and randomly placed in the endoskeleton embedded in a mosaic of minute carbonate grains. Flat grains, mainly of illite/muscovite constitute the external part of the septa. Our observations indicate that Mesorbitolina did select and place agglutinated grains across its test, mainly according to their shape, whereas it did not select particles according to grain size. The distribution of agglutinated particles according to their mineralogical composition shows some contradictory evidence and therefore, at the moment, grain selection in function of mineralogy cannot be completely confirmed or ruled out. Analogies in the test composition of Mesorbitolina specimens from coeval deposits from different areas of southern Italy indicate that the features of their agglutinated test are typical characters of the genus Mesorbitolina. However, it is still unclear what advantage was obtained by the foraminifer by the described test features.
KW  - Agglutinated foraminifera
KW  - Mesorbitolina
KW  - Shallow-water carbonates
KW  - Lower Cretaceous
KW  - Southern Italy
Y1  - 2012
U6  - https://doi.org/10.1016/j.marmicro.2012.04.002
SN  - 0377-8398
VL  - 90-91
IS  - 7
SP  - 60
EP  - 71
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Scharf, Anke
A1  - Handy, Mark R.
A1  - Ziemann, Martin Andreas
A1  - Schmid, Stefan M.
T1  - Peak-temperature patterns of polyphase metamorphism resulting from accretion, subduction and collision (eastern Tauern Window, European Alps) - a study with Raman microspectroscopy on carbonaceous material (RSCM)
JF  - Journal of metamorphic geology
N2  - Raman microspectroscopy on carbonaceous material (RSCM) from the eastern Tauern Window indicates contrasting peak-temperature patterns in three different fabric domains, each of which underwent a poly-metamorphic orogenic evolution: Domain 1 in the northeastern Tauern Window preserves oceanic units (Glockner Nappe System, Matrei Zone) that attained peak temperatures (T-p) of 350-480 degrees C following Late Cretaceous to Palaeogene nappe stacking in an accretionary wedge. Domain 2 in the central Tauern Window experienced T-p of 500-535 degrees C that was attained either within an exhumed Palaeogene subduction channel or during Oligocene Barrovian-type thermal overprinting within the Alpine collisional orogen. Domain 3 in the Eastern Tauern Subdome has a peak-temperature pattern that resulted from Eo-Oligocene nappe stacking of continental units derived from the distal European margin. This pattern acquired its presently concentric pattern in Miocene time due to post-nappe doming and extensional shearing along the Katschberg Shear Zone System (KSZS). T-p values in the largest (Hochalm) dome range from 612 degrees C in its core to 440 degrees C at its rim. The maximum peak-temperature gradient (70 degrees Ckm(-1)) occurs along the eastern margin of this dome where mylonitic shearing of the Katschberg Normal Fault (KNF) significantly thinned the Subpenninic- and Penninic nappe pile, including the pre-existing peak-temperature gradient.
KW  - doming
KW  - Eastern Alps
KW  - high-pressure and Barrovian-type metamorphism
KW  - orogen-parallel extension
KW  - peak-temperature pattern
KW  - Raman microspectroscopy
Y1  - 2013
U6  - https://doi.org/10.1111/jmg.12048
SN  - 0263-4929
VL  - 31
IS  - 8
SP  - 863
EP  - 880
PB  - Wiley-Blackwell
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Schicks, Judith Maria
A1  - Erzinger, Jörg
A1  - Ziemann, Martin Andreas
T1  - Raman spectra of gas hydrates : differences and analogies to ice 1h and (gas saturated) water
N2  - It is generally accepted that Raman spectroscopic investigations of gas hydrates provide vital information regarding the structure of the hydrate, hydrate composition and cage occupancies, but most research is focused on the vibrational spectra of the guest molecules. We show that the shape and position of the Raman signals of the host molecules (H2O) also contain useful additional information. In this study, Raman spectra (200-4000cm(-1)) of (mixed) gas hydrates with variable compositions and different structures are presented. The bands in the O-H stretching region (3000- 3800cm(-1)), the O-H bending region (1600-1700cm(-1)) and the O-O hydrogen bonded stretching region (100-400cm(-1)) are compared with the corresponding bands in Raman spectra of ice Ih and liquid water. The interpretation of the differences and similarities with respect to the crystal structure and possible interactions between guest and host molecules are presented. (c) 2005 Elsevier B.V. All rights reserved
Y1  - 2005
UR  - http://www.sciencedirect.com/science/journal/13861425
U6  - https://doi.org/10.1016/j.saa.2005.02.019
SN  - 1386-1425
ER  - 
TY  - THES
A1  - Ziemann, Martin Andreas
T1  - Spektroskopische Untersuchungen am Sillimanit des Pegmatoids der Reinbolt Hills (Ostantarktis) : ein Beitrag zur Charakterisierung mineralbildender Fluide und der Sillimanit-Genese
KW  - Ostantarktis
KW  - Pegmatoid
KW  - Sillimanit
KW  - Gesteinsbildung
KW  - Fluideinschluss
KW  - Mikroanalyse
KW  - Spektroskopie
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Ziemann, Martin Andreas
A1  - Schmidt, Christian
A1  - Mirwald, Peter W.
T1  - Raman spectroscopic study of the liquid-liquid transition in water
Y1  - 2004
SN  - 0024-4937
ER  - 
TY  - JOUR
A1  - Ziemann, Martin Andreas
A1  - Förster, Hans-Jürgen
A1  - Harlov, Daniel E.
A1  - Frei, Dirk
T1  - Origin of fluorapatite-monazite assemblages in a metamorphosed, sillimanite-bearing pegmatoid, Reinbolt Hills, East Antarctica
N2  - Thermobarometrical and mineral-chemical investigations by electron microprobe and LA-ICP-MS on a sillimanite- bearing pegmatoid from the Reinbolt Hills provide important constraints on the P-T-X-age relations of part of East Antarctica during Pan-African tectonism. U-Th-total Pb ages of monazite imply that the pegmatoid of originally Grenvillan age (zircon U-Pb age of ca. 900 Ma) underwent a major, late Pan-African (Cambrian) regional, granulite-facies metamorphism between 500 and 550 Ma. Most of the monazite formed during this event, as result of apatite metasomatism owing to infiltration of high-grade metamorphic fluids. Apatite-biotite and other mineral thermobarometers define the peak metamorphic temperatures and pressures with 850-950 degrees C and 0.8-1.0 GPa. The F-Cl-OH relations in apatite, and biotite, the chemistry of fluid inclusions and the presence of K-feldspar microveins suggest that the metasomatising fluid was a CO2-bearing, diluted KCl brine. The pegmatoid is the first record of monazite-(Ce) formed from fluorapatite that is rich in U (up to 2.6 Wt% UO2) and possesses Th/U ratios <1 (0.09 on average). These chemical signatures are direct reflection of the U and Th concentration patterns in the parental fluorapatite
Y1  - 2005
SN  - 0935-1221
ER  -