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  • 1
    Monograph available for loan
    Monograph available for loan
    The Variscan orogeny : extent, timescale and the formation of the European crust (2014)
    London : The Geological Society
    Associated volumes
    Details Availability
    Call number: 9/M 07.0421(405)
    In: Geological Society special publication
    Type of Medium: Monograph available for loan
    Pages: 406 S. : farb. Ill., graph. Darst., Kt.
    ISBN: 9781862396586
    Series Statement: Geological Society special publication 405
    URL: http://sp.lyellcollection.org/content/405/1
    Classification:
    Tectonics
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Hercynian-thrust related shear zones and deformation of the Varied Group on the contact of granulites/Southern Moldanubian, Bohemian Massif/ (1986)
    Springer
    International journal of earth sciences 75 (1986), S. 665-683 
    Details
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Abstract The three deformation phases inferred from the detailed structural analysis of the Cesky Krumlov Varied Group record the Hercynian development of the Southern Moldanubian of the Bohemian Massif. The deformation is related to the NW-SE thrusting of the large crustal units including granulites. The formation of the NS and NW-SE trending shear zones is connected with the thrust movement. The structural development begins with F1 isoclinal fold formation, that could originate in unmetamorphosed sediments. In the final stage, they were strongly flattened and B1 boudinage developed in the rocks. Aplite dykes and migmatitization of paragneisses occurred at the same time the rocks were metamorphosed. The D2 deformational phase was produced by the simple shear deformation of the unit and folds of various styles around rigid inclusions and the strike-slip shear zone near the boundary of the granulite and the Varied Group were formed. The F1 and F2 folds are parallel with the stretching and mineral lineation indicating a NS to NW-SE direction of the thrusting. The youngest deformation is characterized by spectacular boudinage and by folding of the vertically oriented planes.
    Abstract: Résumé L'étude structurale détaillée de la Série Variée du Moldanubien méridional dans le Massif de Bohème a permis de distinguer trois phases de déformation dans le développement tectonique varisque. Cette déformation est liée au charriage, du Nord-Ouest vers le Sud-Est, de grandes unités crustales comportant des granulites. La genèse de zones de cisaillement plus jeunes, d'orientation N-S et NW-SE peut Être liée au mÊme processus de charriage. Le développement structural commence avec des plis isoclinaux F1 engendrés vraisemblablement dans les sédiments non métamorphisés. Au stade final de leur formation, ils ont été très aplatis et un boudinage B1 est apparu. L'intrusion de filons d'aplite et la migmatitisation des paragneisses sont contemporaines du métamorphisme. La deuxième déformation D2 a été le fait d'un cisaillement simple; à ce moment se sont formés des plis de style tectonique très variés, localisés fréquemment autour d'inclusions rigides. De cette étape date également le décrochement ductile entre les granulites et la Série Variée. Les plis F1 et F2 sont parallèles à la linéation d'étirement (linéation minérale) qui indique la direction N-S à NW-SE du charriage. La déformation la plus jeune comporte un boudinage spectaculaire et le plissement des plans d'attitude verticale.
    Notes: Zusammenfassung Drei Deformationsphasen der variszischen tektonischen Entwicklung sind in der Bunten Gruppe des südlichen Moldanubikums des Böhmischen Massivs enthalten. Die Deformation ist mit der von NW nach SE orientierten überschiebung von gro\en Krusteneinheiten mit Granuliten verbunden. Die Entstehung von jüngeren N-S und NW-SE verlaufenden Scherzonen kann auf die überschiebungsbewegung bezogen werden. Die Strukturentwicklung beginnt mit F1 isoklinalen Falten, die wahrscheinlich den nichtmetamorphisierten Sedimenten aufgeprägt wurden. Während der Abschlu\phase der Formung wurden sie stark geplättet und es entstand die B1 Boudinage. Die Aplitgänge, Migmatitisation der Paragneisse und Metamorphose der Gesteine sind gleichzeitig. Die D2 Deformationsphase wurde durch einfache Scherung der Einheit hervorgerufen und es entstanden Falten verschiedenen tektonischen Stils in der Umgebung starrer Einschlüsse und die Blattverschiebung an der Grenze von Granulit und Bunter Gruppe. Die F1 und F2 Falten liegen parallel zur Streckungslmeation und überschiebungsrichtung ab. Die jüngste Deformation ist charakterisiert durch eine spektakuläre Boudinage und Faltung der senkrecht stehenden Flächen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01820639
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  • 3
    Electronic Resource
    Electronic Resource
    Superposition of Variscan ductile shear deformation on pre-Variscan mantled gneiss structure (Catherine dome, Erzgebirge, Bohemian massif) (1992)
    Springer
    International journal of earth sciences 81 (1992), S. 501-513 
    Details
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Abstract Three tectonometamorphic events have been recognized in the crystalline rocks of the Catherine mantled gneiss Dome (CD) in the central Erzgebirge. The first tectonometamorphic event is characterized by the acquisition of a S1–S2 metamorphic foliation, development of F2 isoclinal partly syn-schistose folding and intrusion of early synkinematic granites. P-T conditions correspond to higher amphibolite facies metamorphism and culminate in anatexis. A diapiric intrusion of Cambro-Ordovician muscovite-biotite porphyritic granite has verticalized the S2 foliation and is responsible for the genesis of the classical mantled gneiss dome. Oblate strain and orthorhombic diffuse c-axis patterns are typical of the marginal parts of the dome. The whole rock sequence was subsequently affected by westward oriented heterogeneous Variscan ductile shearing under the conditions reaching amphibolite fades. A strongly non-coaxial deformation has partly overprinted the earlier fabrics in anatectic orthogneiss and produced augen-orthogneiss from porphyritic granite in the central part of the CD dome. Prolate to plane strain fabrics, oblique quartz c-axis patterns and a widespread occurrence of S-C fabrics are the most characteristic features of this phase.
    Abstract: Résumé Trois événements tectono-métamorphiques ont été reconnus dans les roches cristallines du dôme de gneiss coiffé de Catherine (Erzgebirge oriental). Le premier de ces événements est caractérisé par l'acquisition d'une foliation S1–2, le développement de plis isoclinaux F2 partiellement synschisteux et l'intrusion de granites syntectoniques précoces. Les conditions (P, T) correspondent au facies supérieur des amphibolites et atteignent l'anatexie. L'intrusion diapirique d'un granite à deux micas cambro-ordovicien a verticalisé la foliation S1–2 et est responsable de la genèse du dôme de gneiss coiffé. Une déformation par aplatissement et des fabriques orthorhombiques diffuses des axes c du quartz caractérisent les zones marginales du dôme. L'ensemble des terrains a été ensuite affecté par un cisaillement ductile varisque hétérogène à vergence ouest, dans les conditions du facies inférieur des amphibolites. Une déformation fortement noncoaxiale a transposé partiellement les structures précoces des orthogneiss anatectiques et a transformé les granites porphyriques de la partie centrale du dôme de Catherine en orthogneiss oeillés. Cette phase est caractérisée par des fabriques obliques pour les axes c du quartz et par de fréquentes structures s-c.
    Notes: Zusammenfassung Im Kristallin des Katherinenberg ‘mantled gneiss dome’ im mittleren Erzgebirge wurde eine dreiphasige tektono-metamorphe Entwicklungsgeschichte nachgewiesen. Das alte Stadium stellt bereits eine polyphase Entwicklung dar. Es wird durch die Anlage eines penetrativen metamorphen Lagenbaus (syn D1 — syn D2), durch F2 früh Isoklinalfalten, sowie durch die Intrusion frühkinematischer z. T. anatektischer Granite charakterisiert. PT-Daten belegen amphibolitfazielle Bedingungen, die lokal zu Anatexis führen. Diapirartige Intrusionen kambro-ordovische, porphyrische Zweiglimmergranite bewirkten eine sehr unterschiedliche z. T. subvertikale Raumlage der regionalmetamorphen Einheiten. Diese Intrusionen des zweiten Stadiums sind verantwortlich für die Entstehung des eigentlichen ‘mantled gneiss dome’. Oblat Gefüge und diffuse Kreuzgürtel-Verteilungen der Quarz c-Achsen sind typisch für die Randbereiche dieses Gneisdomes. Während des jüngsten Stadiums prägen bzw. überprägen westvergente duktile Scherprozesse bei Bedingungen der niedriggradigen Amphibolitfazies die Gefüge. Schiefgürtel-Verteilungen der Quarz c-Achsen und S-C Gefüge charakterisieren diese jüngste, variszische Phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01828612
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  • 4
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    LA-ICP-MS zircon U-Pb data for the key lithological units in the Chonghuer-Jiadengyu region of the Chinese Altai, NW China (Table S1) (2022)
    PANGAEA
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    Publication Date: 2023-01-30
    Keywords: 17CA105-7; 19CA36; Age, 206Pb/238U Lead-Uranium; Age, 207Pb/206Pb Lead-Lead; Age, 207Pb/235U Lead-Uranium; Age, mineral; Age, standard deviation; Calculated; Chinese Altai; Chinese Altai, NW China; Disc age, relative; Event label; LA-ICP-MS; LA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer; Latitude of event; Lead-206/Uranium-238, standard deviation; Lead-206/Uranium-238 ratio; Lead-207/Lead-206 ratio; Lead-207/Lead-206 ratio, standard deviation; Lead-207/Uranium-235, standard deviation; Lead-207/Uranium-235 ratio; Longitude of event; monazite; ROCK; Rock sample; Sample number; Thorium/Uranium ratio; zircon
    Type: Dataset
    Format: text/tab-separated-values, 900 data points
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  • 5
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    LA-ICP-MS monazite U-Pb data for the key lithological units in the Chonghuer-Jiadengyu region of the Chinese Altai, NW China (Table S2) (2022)
    PANGAEA
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    Publication Date: 2023-01-30
    Keywords: 17CA105-4; 17CA107; 19CA41; 19CA45-1; 19CA45-3; Age, 206Pb/238U Lead-Uranium; Age, 207Pb/206Pb Lead-Lead; Age, 207Pb/235U Lead-Uranium; Age, mineral; Age, standard deviation; Chinese Altai; Chinese Altai, NW China; Event label; LA-ICP-MS; LA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer; Latitude of event; Lead-206/Uranium-238, standard deviation; Lead-206/Uranium-238 ratio; Lead-207/Lead-206 ratio; Lead-207/Lead-206 ratio, standard deviation; Lead-207/Uranium-235, standard deviation; Lead-207/Uranium-235 ratio; Longitude of event; monazite; ROCK; Rock sample; Sample number; zircon
    Type: Dataset
    Format: text/tab-separated-values, 1742 data points
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  • 6
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    LA-ICP-MS zircon and monazite U-Pb data for the key lithological units in the Chonghuer-Jiadengyu region of the Chinese Altai (2022)
    PANGAEA
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    Publication Date: 2023-01-30
    Description: Identification of advancing and retreating modes in fossil orogenic belts is not always straightforward. Such issue is addressed in the submitted paper via the case study of the northwestern Chinese Altai where the suprasubduction structures are well preserved. Combined with detailed mapping, structural/petrological observations, seven samples were collected from the key lithological units of Jiadengyu and Chonghuer region in the Xinjiang Uygur Autonomous Region for zircon and monazite U-Pb dating to provide critical geochronological constraints on the individual deformational episodes, including two zircon samples (19CA36 and 17CA105-7) and five monazite samples (17CA107, 17CA105-4, 19CA41, 19CA45-1, and 19CA45-3). Migmatite samples 19CA41 and 17CA107 are characterized by sub-horizontal S1 foliations associated with extensional shear bands. Sample 19CA45-1 collected from the migmatitic Habahe Group domain shows nearly complete transposition of S1 foliation by S2 fabric. Samples 19CA36 and 19CA105-7 were collected from syn-D2 granite intrusions. Leucogranite dyke (sample 17CA105-4) and pegmatite (sample 19CA45-3) were emplaced as tensional fractures that formed in response to D2 shortening. Zircon and monazite grains were separated after rock crushing using conventional heavy liquid and magnetic properties and then selected under a binocular microscope. These grains were mounted in epoxy resin, polished to approximately one-third of their thickness. U-Pb dating of zircon and monazite were analyzed by LA-ICP-MS at the Wuhan SampleSolution Analytical Technology Co., Ltd. U-Pb dating of zircon samples were conducted by a COMPexPro 102 ArF excimer laser and a MicroLas optical system coupled with an Agilent 7700e ICP-MS. Most analyses were performed with a beam diameter and frequency of 32 μm and 5 Hz. GJ-1 standard zircon was also determined for monitoring the accuracy of U-Pb dating. Zircon 91500 was used as an external standard for U-Pb dating calibration. U-Pb dating of monazite samples was performed using the same operating processes and instruments. In this work, the spot size and frequency of the laser were set to 16 μm and 2 Hz, respectively. Monazite standard 44069 was used as an external standard for U-Pb dating. Monazite standard Trebilcock was used as a secondary standard to assess the accuracy of analyses. Each analysis of zircon/monazite was performed using a background acquisition of approximately 25 s followed by 65 s of data acquisition.
    Keywords: Chinese Altai; LA-ICP-MS; monazite; zircon
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 7
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    Whole-rock and mineral chemistry of magmatic rocks from the Nangqian basin (Eastern Tibet) (2020)
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    Publication Date: 2023-11-13
    Description: This dataset reports major and trace elements, Sr and Nd isotopic ratios, carbonate C and O isotopic ratios, and mineral chemistry of Eocene (~35 Ma) magmatic rocks from the Nangqian basin, Eastern Qiangtang, Central Tibet. Samples have microlithic to microphaneritic porphyritic textures. Trachydacites show K-feldspar, plagioclase and amphibole phenocrysts in a matrix of feldspar + amphibole + biotite + quartz + oxides; tranchyandesites show clinopyroxene, apatite and resorbed biotite phenocrysts in a matrix of feldspar + clinopyroxene + oxides. One intrusive outcrop of porphyritic syenite was also sampled, composed of clinopyroxene and biotite phenocrysts in a matrix of feldspar + clinopyroxene + biotite + apatite + oxides. Whole-rock major and trace elements were measured at ISTerre, University Grenoble Alpes. The SARM-CRPG in Nancy and SEDISOR in Brest performed the whole-rock Sr and Nd isotope analyses. In-situ major-element compositions of mineral phases were obtained using the JEOL JXA-8230 Electron Microprobe at ISTerre, University Grenoble Alpes. Stable isotope analysis of carbonates was carried out in the stable isotope laboratory of Geoscience Rennes, CNRS-University of Rennes I. These geochemical data suggest that the source of the Eocene magmas in Nangqian was a H2O- and CO2-enriched lithospheric mantle. A full discussion of the results can be found in the related article.
    Keywords: carbonate C-O isotopy; in-situ mineral geochemistry; Whole-rock geochemistry
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 8
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    Representative major element compositions of clinopyroxenes and phlogopites from ultrapotassic rocks from Nangqian basin (Eastern Tibet) (2020)
    PANGAEA
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    Publication Date: 2023-11-13
    Description: Representative major element compositions (in wt%) of clinopyroxenes and phlogopites from Nangqian ultrapotassic rocks. In-situ major-element compositions of mineral phases were obtained using the JEOL JXA-8230 Electron Microprobe at ISTerre, University Grenoble Alpes. Analytical conditions were 15 kV accelerating voltage and 12 nA beam current. The ZAF procedure was applied to reduce the raw data. The microprobe was calibrated using natural and synthetic standards. An X-ray element map of a calcite-bearing aggregate was acquired using 15 kV accelerating voltage and 10 nA beam current.
    Keywords: Aluminium oxide; Calcium oxide; carbonate C-O isotopy; Chromium(III) oxide; Electron microprobe JEOL JXA-8230; Elements, total; Event label; in-situ mineral geochemistry; Iron oxide, Fe2O3; Latitude of event; Longitude of event; Magnesium number, mineral; Magnesium number liquid; Magnesium oxide; Manganese oxide; Minerals; Nangqian basin, Eastern Tibet; Potassium oxide; ROCK; Rock sample; Sample comment; Silicon dioxide; Sodium oxide; Titanium dioxide; Whole-rock geochemistry; YU-14-07; YU-14-35; YU-14-36
    Type: Dataset
    Format: text/tab-separated-values, 423 data points
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  • 9
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    Whole-rock major and trace elements data, and whole-rock and carbonate isotope data, for the potassic and ultrapotassic rocks from Nangqian basin (Eastern Tibet) (2020)
    PANGAEA
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    Publication Date: 2023-11-13
    Description: Whole-rock major and trace elements data, and whole-rock and carbonate isotope data, for the Nangqian potassic and ultrapotassic rocks. Whole-rock major and trace elements were measured at ISTerre, University Grenoble Alpes. For major elements, 50 mg of rock powder were digested in HF/HNO3 mixture at 90 during five days. Excess HF was neutralized using boric acid and solutions were diluted with 250 mL of Milli-Q water. Major element contents were measured by Inductively Coupled Plasma - Atomic Spectrometry (ICP-AES) in Grenoble using the method given in Chauvel et al. (2011, doi:10.1111/j.1751-908X.2010.00086.x). For trace elements, 100mg of rock powder were digested with a mixture of concentrated HF and HNO3 at 150 for at least two weeks in steer Spar bombs. Excess Hf was neutralized with HNO3, using cycles of acid addition/evaporation. 300 mg of a spike containing Be, Ge, In, Tm and Bi were added to an aliquot of the rock solution corresponding to 8 mg of the initial powder. The solutions were then evaporated, diluted with 2% HNO3 (+ 1 drop of HF), and analysed by Inductively Coupled Plasma - Mass Spectrometry. During measurement, the signal was calibrated using the reference material BR24 (Chauvel et al., 2011, doi:10.1111/j.1751-908X.2010.00086.x), which was run every 4 or 5 analyses. Quality of the analytical procedure was checked by analysing blanks, international reference materials (BHVO2, BEN, BCR2), duplicate solutions and multiple runs of solutions. Only elements with external reproducibility 〈 15% are given. The SARM-CRPG in Nancy and SEDISOR in Brest performed the whole-rock Sr and Nd isotope analyses. Results were normalized to values of 143Nd/144Nd = 0.512110 for JNd-I reference material and 0.511850 for LaJolla, and to 87Sr/86Sr = 0.710250 for the reference material NIST SRM 987. Blanks were 74 pg for Nd and 137 pg for Sr. ε-Nd(T) ratios were calculated using the CHUR isotopic composition of Bouvier et al. (2008, doi:10.1016/j.epsl.2008.06.010). Stable isotope analysis of carbonates was carried out in the stable isotope laboratory of Geoscience Rennes, CNRS-University of Rennes I. Carbonates in whole-rock powders were selectively dissolved at 50 with anhydrous phosphoric acid H3PO4. The released CO2 gases were collected using a cryogenic extraction line, and their isotopic compositions were analyzed by a VG Optima triple collector mass spectrometer. Results were normalized to the values of the laboratory in-house standard Prolabo Rennes and the international standard NBS18. The analytical uncertainty is ±0.2 for δ18O carb, and ±0.1 for δ13C carb.
    Keywords: after Bouvier et al., 2008; Aluminium oxide; Barium; Caesium; Calcium oxide; Calculated; carbonate C-O isotopy; Cerium; Chromium; Cobalt; Copper; Dysprosium; Elements, total; Erbium; Europium; Event label; Gadolinium; Hafnium; Holmium; ICP-AES; ICP-MS; Inductively coupled plasma atomic emission spectroscopy; in-situ mineral geochemistry; Iron oxide, Fe2O3; Isotope ratio mass spectrometry; Lanthanum; Latitude of event; Lead; Lithium; Longitude of event; Loss on ignition; Lutetium; Magnesium number; Magnesium oxide; Manganese oxide; Mass spectrometer Optima-Isogas triple collector; Nangqian basin, Eastern Tibet; Neodymium; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, standard deviation; Neodymium-143/Neodymium-144 ratio (T); Nickel; Niobium; Phosphorus pentoxide; Potassium oxide; Praseodymium; ROCK; Rock sample; Rock type; Rubidium; Rubidium-87/Strontium-86 ratio; Samarium; Samarium-147/Neodymium-144 ratio; SARM-CRPG Nancy and SEDISOR Brest; Scandium; Silicon dioxide; Sodium oxide; Strontium; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, standard deviation; Strontium-87/Strontium-86 ratio (T); Tantalum; Terbium; Thorium; Titanium; Titanium dioxide; Uranium; Vanadium; Whole-rock geochemistry; Ytterbium; Yttrium; YU-14-07; YU-14-15; YU-14-18D; YU-14-29; YU-14-33; YU-14-35; YU-14-36; YU-15-116; YU-15-55; YU-15-83; YU-15-84; YU-15-85; YU-15-87A; YU-15-87B; YU-15-91; YU-15-92; Zinc; Zirconium; δ13C, carbonate; δ18O, carbonate; ε-Neodymium (T)
    Type: Dataset
    Format: text/tab-separated-values, 898 data points
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  • 10
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    Indentation pits: a product of incipient slip on joints with a mesotopography (2007)
    In:  Geological Society Special Publication 231: 315-324.
    Details
    Publication Date: 2007-10-08
    Description: The mechanism for structural damage during incipient slip on joints within the Melechov Granite, Czech Republic, changes with the misalignment of the joint's mesotopography, largely a plumose surface morphology. Prior to slip, the joint surfaces are well mated so that contact area is organized on a microscopic scale. During the first phase of slip, diffusion-mass transfer is the active deformation mechanism between the sliding surfaces of the joints, as indicated by the extensive growth of crystal-fibre lineations characteristic of slickenside surfaces. After slip of the order of 1 cm or more, the mesotopography becomes mismatched and the contact area is reorganized to form indentation pits aligned on the ridges of hackle plumes. Indentation pits, that are testimony to a brittle process, are generated by the excavation of Hertzian ring cracks that propagate under contact loading of a brittle substrate. The depth of the indentation pits increases with contact width, suggesting that indentation creep is active. Following indentation along Hertzian ring cracks the slip mechanism transforms to a frictional abrasion. The distribution of indentation track lengths is consistent with laboratory wear grooves generated during earthquake-like stick-slip sliding. The elliptical shape of the indentation pits indicates a gradual decrease in contact area, a process that is consistent with a slip-weakening mechanism during a stick-slip cycle.
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