Collision-related genesis of the Sharang porphyry molybdenum deposit,Tibet: Evidence from zircon U–Pb ages,Re–Os ages and Lu–Hf isotopes |
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| Institution: | 1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;3. Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China;4. National Research Center of Geoanalysis, Beijing 100037, China;5. State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China;1. School of Earth Science and Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, Guilin University of Technology, Guilin, 541004, China;2. State Key Laboratory of Ore Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China;3. The Institute for Geoscience Research (TIGeR), Curtin University, Perth, WA 6845, Australia;4. Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China;5. Chengdu Institute of Geology and Mineral Resources, Chengdu, 610081, China;1. State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;2. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;3. Department of Earth Sciences, Durham University, Durham DH1 3LE, UK;4. Key Lab of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;5. College of Earth Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China;1. State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;2. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;3. Department of Earth Sciences, University of St Andrews, North Street, St Andrews KY16 9AL, UK;4. Department of Geosciences, National Taiwan University, Taipei 106, China;1. College of Earth Science and MLR Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation, Chengdu University of Technology, Chengdu 610059, China;2. State Key Laboratory of Continental Dynamics, Northwest University, Xi''an 710069, China;3. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;4. Chengdu Center of China Geological Survey, Chengdu 610081, China;5. Tibet Tianyuan Mineral Exploration Co. Ltd., Shigatse 857000, China;1. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta, T6G 2E3, Canada;2. National Research Center for Geoanalysis, Chinese Academy of Geological Sciences, Beijing 100037, PR China;3. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, PR China;4. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, PR China |
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| Abstract: | Sharang is a low-fluorine, calc-alkaline porphyry Mo deposit hosted mainly in a granite porphyry of a multi-stage plutonic complex in the northern Gangdese metallogenic belt, largely with stockwork and ribbon-textured mineralization. The observed age estimates suggest that the formation of the magmatic host complex (52.9–51.6 Ma) and the ore deposit itself (52.3 Ma) occurred during the main stage of the India–Asia collision. The host rocks are characterized by lower zircon εHf(t) values than those of the pre-ore and post-ore rocks. This suggests that the Lhasa terrane basement might play an important role in the formation of Sharang ore-forming intrusions. In view of the framework of magmatic–metallogenic events we suggest that slab roll-back may have induced melting of juvenile crust and ancient continental complexes during the India–Asia collision. This proposal focuses exploration for additional molybdenum deposits on the collision zone. |
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