Genesis of the Yuanlingzhai porphyry molybdenum deposit,Jiangxi province,South China: Constraints from petrochemistry and geochronology |
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| Institution: | 1. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;2. School of Earth Sciences and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, China;3. South Jiangxi Geological Survey Party, Jiangxi Bureau of Geology and Mineral Resource Exploration and Development, Ganzhou 341000, China;1. Department of Biotechnology, Faculty of Agro-Industry, Kasetsart University, 50 Ngam Wong Wan Road, Chatuchak, Bangkok 10900, Thailand;2. Center for Advanced Studies in Tropical Natural Resources (CASTNAR), National Research University-Kasetsart University (NRU-KU), Chatuchak, Bangkok 10900, Thailand;3. School of Engineering, Massey University, Private Bag 11 222, Palmerston North, New Zealand;1. Department of Molecular Biotechnology, Institute for Environmental and Human Health Protection, Division of Chemistry, University of Gdansk, Wita Stwosza 63, 80-308 Gdansk, Poland;2. Thermo Fisher Scientific Baltics UAB, V.A. Graiciuno 8, LT-02241 Vilnius, Lithuania;3. Department of Botany and Genetics, Vilnius University, M.K. Ciurlionio 21/27, LT-03101 Vilnius, Lithuania;4. Department of Molecular Biology, Division of Biology, University of Gdansk, Wita Stwosza 59, 80-308 Gdansk, Poland;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. School of Geosciences and Info-physics, Central South University, Changsha 410083, China;1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China;2. Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871, China |
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| Abstract: | The newly discovered Yuanlingzhai porphyry molybdenum (Mo) deposit in southern Jiangxi province belongs to the group of Mo-only deposits in the Nanling region. The mineralization developed at contact zones between the Yuanlingzhai granite porphyry and Neoproterozoic metamorphic rocks of the Xunwu Formation. Precise LA–MC–ICPMS zircon U–Pb dating of the Yuanlingzhai porphyry, as well as the adjacent western Keshubei and eastern Keshubei granites, yielded ages of 165.49 ± 0.59 Ma, 159.68 ± 0.43 Ma, and 185.13 ± 0.52–195.14 ± 0.63 Ma, respectively. Molybdenite Re–Os isochron ages of the ores are 160 ± 1–162.7 ± 1.1 Ma, which is consistent with the age of large-scale W–Sn deposits in South China. The Yuanlingzhai porphyry is characterized by high K2O, P2O5, and A/CNK (1.33–1.59), and low CaO and Na2O. The rock shows relatively enriched LREE without significant Eu anomalies (Eu/Eu* = 0.80–0.90). Geochemical and mineralogical characteristics indicate that the ore-hosting porphyry is a typical S-type granite generated from the partial melting of crustal material with only minor mantle contribution. Both Harker and evolutionary discrimination diagrams indicate that the Yuanlangzhai and western Keshubei granites are not products of co-magmatic evolution. The Keshubei granites and Xunwu Formation were not significant sources for the components in the porphyry mineralization, but the Yuanlangzhai granite may have supplied some ore-forming material. However, the main ore-forming material was carried by fluids from deep sources, as demonstrated by fluid inclusion and stable isotope data from the molybdenum deposit. The Mo porphyry deposit formed in an extensional setting, and was possibly associated with Jurassic subduction of the Izanagi Plate. |
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| Keywords: | U–Pb geochronology Re–Os geochronology Petrochemistry Yuanlingzhai porphyry Mo deposit Keshubei granite Nanling South China |
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