Geology,geochemistry and age of the Hukeng tungsten deposit,Southern China |
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| Authors: | Jun Liu Jingwen Mao Huishou Ye Wei Zhang |
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| Institution: | 1. CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of Chinas, Hefei 230026, China;2. CAS Center for Excellence in Comparative Planetology, Hefei 230026, China;3. Wuhan Centre of China Geological Survey, Wuhan 430205, China;4. Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, College of Earth Sciences, Guilin University of Technology, Guilin 541004, China;1. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, People''s Republic of China;2. National Research Center of Geoanalysis, Beijing 100037, People''s Republic of China;3. South Jiangxi Geological Survey Party of JBEDGMR, Ganzhou 341000, People''s Republic of China;1. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. 416 Geological Team, Bureau of Geology and Mineral Exploration and Development of Hunan Province, Zhuzhou 412007, China;4. College of Earth Sciences, Guilin University of Technology, Guilin, Guangxi 541004, China |
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| Abstract: | The Hukeng tungsten deposit, located in the Wugongshan area in central part of Jiangxi province, South China, is a large-scale quartz-vein wolframite deposit. It is hosted in the Hukeng granitic intrusion. Based on the mineral assemblage and crosscutting relationship of the veins, three mineralization stages are identified, including: (1) quartz–wolframite stage, (2) quartz–fluorite–wolframite stage, and (3) quartz–pyrite–sphalerite–wolframite stage.The homogenization temperatures of fluid inclusions in vein quartz vary from 220 to 320 °C, and the salinities are from 0 to 10 wt.% NaCl equiv.; corresponding densities range from 0.7 to 1 g/cm3. These features indicated that the ore-forming fluids in the Hukeng tungsten deposit have medium temperature, low density and low salinity.The δ18OSMOW values of quartz range from 10.8‰ to 14.4‰, with corresponding δ18Ofluid values of 3.7‰ to 7.7‰, and δD values of fluid inclusions of between ? 70‰ and ? 55‰. The combined isotopic data indicate that the ore-forming fluids of the Hukeng tungsten deposit were mainly derived from magmatic water, with some minor input from meteoric water.We have carried out molybdenite Re–Os and muscovite 40Ar/39Ar dating to constrain the timing of mineralization. Re–Os dating of six molybdenite samples yielded model ages ranging from 149.1 ± 2.0 to 150.7 ± 3.7 Ma, with an average of 150.0 Ma. The Re–Os analyses give a well-defined 187Re/187Os isochron with an age of 150.2 ± 2.2 Ma (MSWD = 0.60). Hydrothermal muscovite yields a plateau 40Ar/39Ar age of 147.2 ± 1.4 Ma. 40Ar/39Ar age is in good agreement with the Re–Os age. These ages show that the timing of tungsten mineralization occurred at about 150 Ma. Our new data, when combined with published geochronological results from the other major deposits in this region, suggest that widespread W mineralization occurred in the Late Jurassic throughout South China. |
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