Geochronology of the Xihuashan Tungsten Deposit in Southeastern China: Constraints from Re–Os and U–Pb Dating |
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| Authors: | Fang‐Yue WANG Cong‐Ying LI Ming‐Xing LING Hong ZHANG Ya‐Li SUN Weidong SUN |
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| Affiliation: | 1. Research Center for Mineral Resources, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China;2. Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, the Chinese Academy of Science, Guangzhou, China;3. Graduate University of the Chinese Academy of Sciences, Beijing, China;4. Key Laboratory of Mineral and Mineralization, Guangzhou Institute of Geochemistry, the Chinese Academy of Science, Guangzhou, China |
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| Abstract: | Xihuashan tungsten deposit is one of the earliest explored tungsten deposits in southeastern China. It is a vein type deposit genetically associated with the Xihuashan granite pluton. Here we report new dating and zircon geochemistry results. Re–Os isotopic dating for molybdenite intergrowth with wolframite in the oldest generation of the Xihuashan pluton yielded an isochron age of 157.0 ± 2.5 Ma (2σ). Zircon U–Pb laser ablation inductively coupled plasma mass spectrometry (LA‐ICP‐MS) dating shows that the pluton crystallized at 155.7 ± 2.2 Ma (2σ). This age is similar to the molybdenite Re–Os age for the ore deposit within error. This, together with published data, suggests that the major W(Mo)‐Sn mineralization occurred between 160–150 Ma in southeastern China. These deposits constitute a major part of the magmatic‐metallogenic belt of eastern Nanlin. The lower Re content in molybdenite of the Xihuashan tungsten deposit shows crustal origin for the ore‐forming material. The limited direct contributions from the subducting slab for the tungsten mineralization in the Nanling region suggest a change of the style of the paleo‐Pacific plate beneath southeastern China. |
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| Keywords: | Nanling Re– Os tungsten deposit Xihuashan zircon |
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