The exhumation history of collision-related mineralizing systems in Tibet: Insights from thermal studies of the Sharang and Yaguila deposits,central Lhasa |
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| Institution: | 1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beitucheng West Road 19#, Chaoyang District, Beijing 100029, China;2. John De Laeter Center for Isotope Research, Department of Applied Geology/Applied Physics, Curtin University, Perth, WA 6945, Australia;3. Key Laboratory of Continental Collision and Plateau Uplift, Institute of Qinghai–Tibetan Plateau Research, Chinese Academy of Sciences, 4A Datun Road, Chaoyang District, Beijing 100085, China;4. MRL Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China;1. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada;2. Institute of Geology, Chinese Academy of Geological Sciences Beijing 100037, PR China;3. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi''an 710069, PR China;1. CSIRO Mineral Resources, Perth, WA 6151, Australia;2. Department of Mineral Exploration and Mining, British Columbia Institute of Technology, 3700 Willingdon Avenue, Burnaby, British Columbia V5G 3H2, Canada;3. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, PR China;4. Shijiazhuang University of Economics, Shijiazhuang, Hebei 050031, PR China;5. Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation, Chengdu University of Technology, Chengdu 610059, PR China;6. Applied Geology, John de Laeter Centre, TIGeR, Curtin University, Perth, WA 6102, Australia;7. Centre for Microscopy, Characterisation and Analysis, University of Western Australia, Perth, WA 6009, Australia;8. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, PR China;1. State Key Laboratory of Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China;2. Department of Earth and Environmental Sciences, Università di Milano-Bicocca, Milano 20126, Italy |
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| Abstract: | The large, newly discovered Sharang porphyry Mo deposit and nearby Yaguila skarn Pb–Zn–Ag (–Mo) deposit reside in the central Lhasa terrane, northern Gangdese metallogenic belt, Tibet. Multiple mineral chronometers (zircon U–Pb, sericite 40Ar–39Ar, and zircon and apatite (U–Th)/He) reveal that ore-forming porphyritic intrusions experienced rapid cooling (> 100 °C/Ma) during a monotonic magmatic–hydrothermal evolution. The magmatic–hydrothermal ore-forming event at Sharang lasted ~ 6.0 Myr (~ 1.8 Myr for cooling from > 900 to 350 °C and ~ 4.0 Myr for cooling from 350 to 200 °C) whereas cooling was more prolonged during ore formation at Yaguila (~ 1.8 Myr from > 900 to 500 °C and a maximum of ~ 16 Myr from > 900 to 350 °C). All porphyritic intrusions in the ore district experienced exhumation at a rate of 0.07–0.09 mm/yr (apatite He ages between ~ 37 and 30 Ma). Combined with previous studies, this work implies that uplift of the eastern section of the Lhasa terrane expanded from central Lhasa (37–30 Ma) to southern Lhasa (15–12 Ma) at an increasing exhumation rate. All available geochronologic data reveal that magmatic–hydrothermal–exhumation activities in the Sharang–Yaguila ore district occurred within four periods of magmatism with related mineralization. Significant porphyry-type Mo mineralization was associated with Late Cretaceous–Eocene felsic porphyritic intrusions in the central Lhasa terrane, resulting from Neotethyan oceanic subduction and India–Asia continental collision. |
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