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  • 1
    Call number: 9/M 04.0605
    In: Geological Society special publication
    Type of Medium: Monograph available for loan
    Pages: VI, 266 S. , Ill., graph. Darst
    ISBN: 1862391467
    Series Statement: Geological Society special publication 220
    Classification:
    Stratigraphy
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Call number: 9/M 07.0421(481)
    In: Geological Society Special Publication
    Description / Table of Contents: Abstract This volume comprises 17 contributions that address the architecture and geodynamic evolution of the Himalaya–Karakoram–Tibet (HKT) system, covering wide aspects, from the active seismicity of the present day to the remnants of the Proterozoic orogen. The articles investigate the HKT system at different scales, blending field research with laboratory studies. The role of various lithospheric components and their inheritance in the geodynamic and magmatic evolution of the HKT system through time, and their links to global geological events, are studied in the field. The laboratory research focuses on the (sub-)micrometre scale, detailing micro-structural geology, crystal chemistry, geochronology, and the study of circulating fluids, their preservation (trapped in fluid inclusions) and their evolution, distribution, migration and interaction with the solid host. An orogen over 2000 km long can be understood only if the processes at the nanometre and micrometre scales are taken into account. The contributions in this volume successfully combine these scales to enhance our understanding of the HKT system.
    Type of Medium: Monograph available for loan
    Pages: vi, 386 Seiten , Illustrationen
    ISBN: 978-1-78620-403-5
    Series Statement: Geological Society Special Publication 481
    Language: English
    Location: Reading room
    Branch Library: GFZ Library
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  • 3
    Keywords: Himalaya–Karakoram–Tibet system ; tectonics ; geodynamic evolution
    Description / Table of Contents: Crustal architecture and evolution of the Himalaya–Karakoram–Tibet Orogen: introduction / Rajesh Sharma, Igor M. Villa and Santosh Kumar / Geological Society, London, Special Publications, 481, 1-5, 1 August 2019, https://doi.org/10.1144/SP481-2019-46 --- Nepal earthquake evidence from GNSS data at the Everest Pyramid Lab / G. Poretti, F. Morsut and F. Pettenati / Geological Society, London, Special Publications, 481, 7-18, 31 July 2019, https://doi.org/10.1144/SP481-2017-71 --- Delineation of lithosphere structure and characterization of the Moho geometry under the Himalaya–Karakoram–Tibet collision zone using surface-wave tomography / Naresh Kumar, A. Aoudia, M. Guidarelli, Vivek G. Babu, Devajit Hazarika and D. K. Yadav / Geological Society, London, Special Publications, 481, 19-40, 19 March 2019, https://doi.org/10.1144/SP481-2017-172 --- Seismotectonics of central and NW Himalaya: plate boundary–wedge thrust earthquakes in thin- and thick-skinned tectonic framework / V. C. Thakur, R. Jayangondaperumal and V. Joevivek / Geological Society, London, Special Publications, 481, 41-63, 17 December 2018, https://doi.org/10.1144/SP481.8 --- Tectonic control over exhumation in the Arunachal Himalaya: new constraints from Apatite Fission Track Analysis / Vikas Adlakha, R. C. Patel, Akhil Kumar and Nand Lal / Geological Society, London, Special Publications, 481, 65-79, 13 April 2018, https://doi.org/10.1144/SP481.1 --- Structural and thermochronological studies of the Almora klippe, Kumaun, NW India: implications for crustal thickening and exhumation of the NW Himalaya / M. K. Puniya, R. C. Patel and P. D. Pant / Geological Society, London, Special Publications, 481, 81-110, 20 February 2019, https://doi.org/10.1144/SP481-2017-74 --- Field documentation and genesis of the back-structures from the Garhwal Lesser Himalaya, Uttarakhand, India / Narayan Bose and Soumyajit Mukherjee / Geological Society, London, Special Publications, 481, 111-125, 13 February 2019, https://doi.org/10.1144/SP481-2018-81 --- Dating protracted fault activities: microstructures, microchemistry and geochronology of the Vaikrita Thrust, Main Central Thrust zone, Garhwal Himalaya, NW India / Chiara Montemagni, Chiara Montomoli, Salvatore Iaccarino, Rodolfo Carosi, Arvind K. Jain, Hans-J. Massonne and Igor M. Villa / Geological Society, London, Special Publications, 481, 127-146, 17 April 2018, https://doi.org/10.1144/SP481.3 --- Early Oligocene partial melting via biotite dehydration melting and prolonged low-pressure–low-temperature metamorphism of the upper High Himalaya Crystalline Sequence in the far east of Nepal / T. Imayama, T. Takeshita, K. Yi and M. Fukuyama / Geological Society, London, Special Publications, 481, 147-173, 17 April 2018, https://doi.org/10.1144/SP481.2 --- Myrmekitic intergrowth of tourmaline and quartz in eclogite-hosting gneisses of the Tso Morari ultrahigh-pressure metamorphic terrane (Eastern Ladakh, India): a possible record of high-pressure conditions / Igor Broska, Peter Bačík, Santosh Kumar, Marian Janák, Sergiy Kurylo, Jan Filip, Jakub Bazarnik and Tomáš Mikuš / Geological Society, London, Special Publications, 481, 175-194, 13 May 2019, https://doi.org/10.1144/SP481-2017-167 --- Subduction-related Manipur Ophiolite Complex, Indo-Myanmar Ranges: elemental and isotopic record of mantle metasomatism / Oinam Kingson, Rajneesh Bhutani, S. Balakrishnan, J. K. Dash and Anil D. Shukla / Geological Society, London, Special Publications, 481, 195-210, 23 January 2019, https://doi.org/10.1144/SP481.9 --- A new occurrence of lazulite from the Main Central Thrust in Kumaun Himalaya, India: fluid inclusion, EPMA and Raman spectroscopy focusing on lazulite in a highly tectonized zone / Dinesh S. Chauhan, Rajesh Sharma and D. R. Rao / Geological Society, London, Special Publications, 481, 211-230, 5 July 2019, https://doi.org/10.1144/SP481-2018-117 --- Geochemical discrimination and petrogenetic affinities of dykes intruding the Ladakh batholith, NW India / A. R. Heri, J. Bahl and I. M. Villa / Geological Society, London, Special Publications, 481, 231-250, 18 June 2019, https://doi.org/10.1144/SP481-2017-150 --- Influence of inherited Indian basement faults on the evolution of the Himalayan Orogen / Laurent Godin, Renaud Soucy La Roche, Lindsay Waffle and Lyal B. Harris / Geological Society, London, Special Publications, 481, 251-276, 13 April 2018, https://doi.org/10.1144/SP481.4 --- Origin of the Ordovician Mansehra granite in the NW Himalaya, Pakistan: constraints from Sr–Nd isotopic data, zircon U–Pb age and Hf isotopes / Masatsugu Ogasawara, Mayuko Fukuyama, Rehanul Haq Siddiqui and Ye Zhao / Geological Society, London, Special Publications, 481, 277-298, 23 October 2018, https://doi.org/10.1144/SP481.5 --- Zircon U–Pb ages and Lu–Hf isotopes of metagranitoids from the Subansiri region, Eastern Himalaya: implications for crustal evolution along the northern Indian passive margin in the early Paleozoic / R. K. Bikramaditya, A. Krishnakanta Singh, Sun-Lin Chung, Rajesh Sharma and Hao-Yang Lee / Geological Society, London, Special Publications, 481, 299-318, 22 November 2018, https://doi.org/10.1144/SP481.7 --- Age and geochemistry of the Paleoproterozoic Bhatwari Gneiss of Garhwal Lesser Himalaya, NW India: implications for the pre-Himalayan magmatic history of the Lesser Himalayan basement rocks / Aranya Sen, Koushik Sen, Hari B. Srivastava, Saurabh Singhal and Purbajyoti Phukon / Geological Society, London, Special Publications, 481, 319-339, 25 October 2018, https://doi.org/10.1144/SP481.6 --- Petrology, geochemistry and zircon U–Pb–Lu–Hf isotopes of Paleoproterozoic granite gneiss from Bomdila in the western Arunachal Himalaya, NE India / Manjari Pathak and Santosh Kumar / Geological Society, London, Special Publications, 481, 341-377, 24 April 2019, https://doi.org/10.1144/SP481-2017-169
    Pages: Online-Ressource (VI, 386 Seiten) , Illustrationen, Diagramme
    ISBN: 9781786204035
    Language: English
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of volcanology 54 (1991), S. 84-86 
    ISSN: 1432-0819
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract 40Ar/39 Ar stepwise heating on one hydrothermal anhydrite and two partly hydrothermalized feldspars from a borehole in Vulcano volcano show that the initial trapped Ar does not have a constant isotopic composition. The constant 40Ar/36Ar ratio of the anhydrite, 306±3, is not a well-defined endmember for the two feldspars, which record a variety of fluid compositions. As the system is young (〈100 ka), radiogenic Ar is much less than excess Ar.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A geochronological investigation of two rocks with an eclogitic assemblage (omphacite-garnet-quartz-rutile) from the High Himalaya using the Sm/Nd, Rb/Sr, U/Pb and Ar/Ar methods is presented here. The first three methods outline a cooling history from the time of peak metamorphism at 49±6 Ma recorded by Sm/Nd in garnet-clinopyroxene to the closure of Rb/Sr in phengite at 43±1 Ma and U/Pb in rutile at 39–40 Ma. The Sm/Nd isotopic system was fully equilibrated during eclogitization and has not been disturbed since; its mineral ages may date the peak metamorphic conditions (650±50°C at 13–18 kbar: Pognante and Spencer, 1991). The Ar/Ar data reveal the presence of substantial amounts of excess 40Ar in hornblende, and yield a statistically acceptable but geologically meaningless phengite plateau age of 81.4±0.2 Ma, inconsistent with Sm/Nd, Rb/Sr and U/Pb. This questions the use of such a chronometer for the dating of high-pressure assemblages. The results imply a Late Palaeocene or Early Eocene subduction of the northern Indian plate margin in NW Himalaya. The fact that eclogites are restricted to NW Himalaya may be the result of a peculiar p-T-t path associated with a high convergence rate during the first indentation, in contrast to the later and slow subduction in Central and Eastern Himalaya.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The inception and growth of the active Carpino-Le Piane Basin Fault System (CLPBFS; central-southern Apennines, Italy) was analysed with respect to the neighbouring Isernia and Surrounding (ISFS) and Boiano Basin (BBFS) extensional Fault Systems. 39Ar–40Ar dating showed that the BBFS was already active 649 ± 21 ka bp and that the ISFS was active at least 476 ±10 ka bp, whereas the activity of the CLPBFS started certainly later than 253 ± 22 ka bp, and very probably as recently as 〈28 ka bp. These ages, combined with structural data (geometry and kinematics of the fault systems), indicate that the inception and development of the CLPBFS could be strictly related to the stress changes caused by earthquakes occurring on the BBFS.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford UK : Blackwell Publishing Ltd
    Terra nova 13 (2001), S. 0 
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Contributions to mineralogy and petrology 115 (1994), S. 415-426 
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The Larderello geothermal field is generally accepted to have been produced by a granite intrusion at 4–9 km depth. Hydrothermal parageneses and fluid inclusions always formed at temperatures greater than or equal to the current ones, which implies that the field has always undergone a roughly monotonic cooling history (fluctuations 〈 40 K) since intrusion of the granite at 4 Ma. The heat required to maintain the thermal anomaly over such a long period is supplied by a seismically anomalous body of ≈ 32000 km3 rooted in the mantle. Borehole minerals from Larderello are thus a unique well-calibrated natural example of thermally induced Ar and Sr loss under geological conditions and time spans. The observations (biotites retain Ar above 450°C) agree well with other, albeit less precise, geological determinations, but contrast with laboratory determinations of diffusivity from the literature. We therefore performed a hydrothermal experiment on two Larderello biotites and derived a diffusivity D Lab(370°C)=5.3·10-18 cm2s-1, in agreement with published estimates of diffusivity in annite. From D Lab and the rejuvenation of the K/Ar ages we calculate maximum survival times at the present in-hole temperatures. They trend smoothly over almost two orders of magnitude from 352 ka to 5.3 ka, anticorrelating with depth: laboratory diffusivities are inconsistent not only with geological facts, but also among themselves. From the geologically constrained lifetime of the thermal anomaly we derive a diffusivity D G(370°C)=3.81·1021 cm2s-1, 3±1 orders of magnitude lower than D Lab. The cause of these discrepancies must be sought among various laboratory artefacts: overstepping of a critical temperature T *; enhanced diffusivities in “wet” experiments; presence of fast pathway (dislocation and pipe) diffusion, and of dissolution/reprecipitation reactions, which we imaged by scanning electron microscopy. These phenomena are minor in geological settings: in the absence of mineral transformation reactions, complete or near-complete resetting is achieved only by volume diffusion. Therefore, laboratory determinations will necessarily result in apparent diffusivities that are too high compared to those actually effecting the resetting of natural geochronometers.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Contributions to mineralogy and petrology 140 (2000), S. 363-381 
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Mafic rocks of a Permian crust to mantle section in Val Malenco (Italy) display a multi-stage evolution: pre-Alpine exhumation to the ocean floor, followed by burial and re-exhumation during Alpine convergence. Four prominent generations of amphiboles were formed during these stages. On the basis of microstructural investigations combined with electron microprobe analyses two amphibole generations can be assigned to the pre-Alpine decompression and two to the Alpine metamorphic P–T evolution. The different amphiboles have distinct NaM4, Ca, K and Cl contents according to different P–T conditions and fluid chemistry. Analysing these mixed amphiboles by the 39Ar−40Ar stepwise heating technique yielded very complex age spectra. However, by correlating amphibole compositions directly obtained from the electron microprobe with the components deduced from the release of Ar isotopes during stepwise heating, obtained ages were consistent with the geological history deduced from field and petrological studies. The two generations of pre-Alpine amphiboles gave distinguishable Triassic to Late Jurassic/Early Cretaceous ages (≈225 and 130–140 Ma respectively). High-NaM4 amphiboles have higher isotopic ages than low-NaM4 ones, in agreement with their decompressional evolution. The exhumation of the Permian crust to mantle section is represented by the former age. The latter age concerns Cl-dominated amphibole related to an Early Cretaceous oceanic stage. For the early Alpine, pressure-dominated metamorphism we obtained a Late Cretaceous age (83–91 Ma). The later, temperature-dominated overprint is significantly younger, as indicated by 39Ar−40Ar ages of 67–73 Ma. These Late Cretaceous ages favour an Adriatic origin for the Malenco unit. Our data show that 39Ar−40Ar dating combined with detailed microprobe analysis can exploit the potential to relate conditions of amphibole formation to their respective ages.
    Type of Medium: Electronic Resource
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  • 10
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    Unknown
    PANGAEA
    In:  Supplement to: Jagoutz, Oliver; Müntener, Othmar; Manatschal, Gianreto; Rubatto, Daniela; Péron-Pinvidic, Gwenn; Turrin, Brent D; Villa, Igor M (2007): The rift-to-drift transition in the North Atlantic: A stuttering start of the MORB machine? Geology, 35(12), 1087-1090, https://doi.org/10.1130/G23613A.1
    Publication Date: 2024-01-09
    Description: We report U-Pb and 39Ar-40Ar measurements on plutonic rocks recovered from the Ocean Drilling Program (ODP) Legs 173 and 210. Drilling revealed continental crust (Sites 1067 and 1069) and exhumed mantle (Sites 1070 and 1068) along the Iberia margin and exhumed mantle (Site 1277) on the conjugate Newfoundland margin. Our data record a complex igneous and thermal history related to the transition from rifting to seafloor spreading. The results show that the rift-to-drift transition is marked by a stuttering start of MORB-type magmatic activity. Subsequent to initial alkaline magmatism, localized mid-oceanic ridge basalts (MORB) magmatism was again replaced by basin-wide alkaline events, caused by a low degree of decompression melting due to tectonic delocalization of deformation. Such "off-axis" magmatism might be a common process in (ultra-) slow oceanic spreading systems, where "magmatic" and "tectonic" spreading varies in both space and time.
    Keywords: 173-1067A; 173-1068A; 173-1069A; 173-1070; 173-1070A; 210-1277; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg173; Leg210; Ocean Drilling Program; ODP; South Atlantic Ocean
    Type: Dataset
    Format: application/zip, 7 datasets
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