Preservation and exhumation history of the Harizha-Halongxiuma mining area in the East Kunlun Range,Northeastern Tibetan Plateau,China |
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| Institution: | 1. Science Research Institute, China University of Geosciences, Beijing, China;2. Department of Earth Sciences, University College London, UK;3. School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou, China;4. No.3 Exploration Institute of Geology and Mineral Resources of Qinghai Province, Xining 810029, China;1. School of Earth Science and Geological Engineering, Sun Yat-sen University, 510 275 Guangzhou, PR China;2. Institute of Geology and Mineral Exploration, Lefkovrisi, 50100 Kozani, Greece;3. Dipartimento di Scienze della Terra, Università degli Studi di Milano, via S. Botticelli, 23-20133 Milano, Italy;4. Foundation for Research and Technology-Hellas, Institute of Chemical Engineering Sciences (FORTH/ICE-HT), P.O. Box 1414, GR-26504 Rio-Patras, Greece;5. Department of Materials Science, University of Patras, GR-26504 Rio-Patras, Greece;1. College of Earth Sciences and Recourses, Chang’an University, Xi’an 710054, China;2. Department of Geological Sciences, Indiana University, Bloomington, IN 47405, USA;1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Department of Earth and Atmospheric Sciences, Indiana University, Bloomington, IN 47405, USA;4. National Research Center for Geoanalysis, Beijing 100037, China;1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2. School of the Earth and Space Sciences, Peking University, Beijing 100871, China;3. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;4. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;5. China National Geological and Mining Corporation, Beijing 100029, China;6. Huaxia Mining Corporation, Tibet 850000, China |
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| Abstract: | The extent to which ore bodies are preserved in orogenic belts remains a poorly understood area of ore deposit research. Using zircon and apatite fission track analysis together with apatite (U-Th)/He dating we constrained the erosion history of the ore bodies in the Harizha–Halongxiuma mining area of the East Kunlun Range, Northern Tibetan Plateau, China. Apatite fission-track ages range from 114 ± 8 to 87 ± 6 Ma, with mean track lengths varying from 11.4 ± 1.9 to 12.9 ± 2.0 μm. Zircon fission-track ages vary from 205 ± 14 to 142 ± 7 Ma. In addition, apatite (U–Th)/He dating yielded ages of 60–56 Ma. The thermal history of Jiapigou was modelled based on the apatite fission-track data, including ages and track lengths, with constraints of zircon fission-track ages and (U-Th)/He ages. The exhumation history of the Harizha–Halongxiuma mining area was reconstructed with these age data, revealing that since the early Mesozoic the area has undergone three cooling stages: (1) rapid cooling from 175 ± 30 Ma to 100 ± 10 Ma with a cooling rate and inferred exhumation of 2.0 ± 0.8 °C/Myr and 4.3 ± 1.7 km, respectively; (2) a relatively stable stage from 100 ± 10 Ma to 40 ± 10 Ma with a cooling rate and inferred exhumation of 0.3 ± 0.1 °C/Myr and 0.5 ± 0.2 km, respectively; and (3) rapid cooling since 40 ± 10 Ma with a cooling rate and inferred exhumation of 1.2 ± 0.6 °C/Myr and 1.4 ± 0.4 km, respectively. This exhumation history is consistent with the subduction process of Pacific plate and the strike slip movements of Dunmi fault. The total exhumation after main mineralization is calculated to be 7.6 ± 3.2 km, suggesting that ore bodies in the Harizha–Halongxiuma mining area remain partially preserved. |
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| Keywords: | Ore body preservation Fission-track dating Apatite (U-Th)/He Exhumation history East Kunlun Range |
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