Syn-kinematic emplacement of the Pangong metamorphic and magmatic complex along the Karakorum Fault (N Ladakh) |
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| Authors: | Y Rolland G Mahéo A Pêcher IM Villa |
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| Institution: | 1. Department of Earth Sciences, Oxford University, Parks Road, Oxford, OX1 3PR, UK;2. School of Geosciences, The University of Sydney, Sydney, NSW 2006, Australia;3. NIGL, British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK;4. Department of Geology, School of Natural Sciences, Trinity College, Dublin 2, Ireland;5. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China;1. Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands;2. Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah, USA;3. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;4. Guangdong Provincial Key Laboratory of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou, China;5. Department of Geosciences, University of Arizona, Tucson, Arizona, USA;6. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing, China;7. Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY 14627, USA;8. Center for Earth Evolution and Dynamics (CEED), University of Oslo, Sem Saelandsvei 24, NO-0316 Oslo, Norway;1. Wadia Institute of Himalayan Geology, Dehradun 248 001, India;2. CSIR-Central Building Research Institute, Roorkee 247667, India;3. Department of Earth Sciences, Indian Institute of Technology, Roorkee 247667, India;4. Department of Geophysics, Kurukshetra University, Kurukshetra 136119, India |
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| Abstract: | This paper investigates the age, P–T conditions and kinematics of Karakorum Fault (KF) zone rocks in the NW part of the Himalaya–Karakorum belt. Granulite to greenschist facies assemblages were developed within the KF zone during strike-slip shearing. The granulites were formed at high temperature (800 °C, 5.5 kbar), were subsequently retromorphosed into the amphibolite facies (700–750 °C, 4–5 kbar) and the greenschist facies (350–400 °C, 3–4 kbar). The Tangtse granite emplaced syn-kinematically at the contact between a LT and the HT granulite facies. Intrusion occurred during the juxtaposition of the two units under amphibolite conditions. Microstructures observed within the Tangtse granite exhibit a syn-magmatic dextral S–C fabric. Compiled U–Pb and Ar–Ar data show that in the central KF segment, granulite facies metamorphism occurred at a minimum age of 32 Ma, subsequent amphibolite facies metamorphism at 20–18 Ma. Further shearing under amphibolite facies (650–500 °C) was recorded at 13.6 ± 0.9 Ma, and greenschist-facies mica growth at 11 Ma. These data give further constrains to the age of initiation and depth of the Karakorum Fault. The granulite-facies conditions suggest that the KF, accommodating the lateral extrusion of Tibet, could be at least a crustal or even a Lithosphere-scale shear zone comparable to other peri-Himalayan faults. |
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