Caledonian ore-forming event in the Laojunshan mining district, SE Yunnan Province, China : In situ LA-MC-ICP-MS U-Pb dating on cassiterite

DOI Web Site Web Site 参考文献27件
  • Du Shengjiang
    State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences University of Chinese Academy of Sciences
  • Wen Hanjie
    State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences
  • Qin Chaojian
    State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences
  • Yan Yongfeng
    Kunming University of Science and Technology
  • Yang Guangshu
    Kunming University of Science and Technology
  • Fan Haifeng
    State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences
  • Zhang Wenjiang
    Guizhou Sifang Jinshi Technology Consulting Company
  • Zhang Lei
    State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences University of Chinese Academy of Sciences
  • Wang Dong
    Kunming University of Science and Technology
  • Li Huaikun
    Tianjin Institute of Geology and Mineral Resources
  • Geng Jianzhen
    Tianjin Institute of Geology and Mineral Resources
  • Meng Guangzhi
    306 Geological Brigade of Southwest Department of Geological Exploring

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タイトル別名
  • Caledonian ore-forming event in the Laojunshan mining district, SE Yunnan Province, China: <i>In situ</i> LA-MC-ICP-MS U-Pb dating on cassiterite

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説明

The Laojunshan mining district is an important part of the SE Yunnan W-Sn polymetallic mineral belt. Previous geochronologic data have shown that the main metallogenic stages in this area are Indosinian and Yanshanian in age. In this paper, we present a new dating result that differs from those published previously by using the in situ LA-MC-ICP-MS geochronologic method on a cassiterite sample from the giant Xinzhai tin deposit. Analyses of this sample yielded a U-Pb Tera-Wasserburg age of 419.1 ± 6.7 Ma. This new date identifies a Caledonian metallogenic event at the Xinzhai tin deposit and this age is also consistent with Caledonian magmatic and tectonic activity previously recognized in the Laojunshan mining district. Therefore, not only Yanshanian and Indosinian metallogenic stages but also a Caledonian mineralization event must have occurred in the study area. This new result may play an important role in ore prospecting and metallogenic study in the Laojunshan mining district and, more importantly, in all of SE Yunnan.

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