Earth Science Frontiers ›› 2021, Vol. 28 ›› Issue (3): 252-270.DOI: 10.13745/j.esf.sf.2021.1.26

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Triassic deposits in South China: Geological characteristics, ore-forming mechanism and ore deposit model

XIE Guiqing1,2(), MAO Jingwen1,2, ZHANG Changqing2, LI Wei2, SONG Shiwei1, ZHANG Rongqing3   

  1. 1. Institute of Earth Sciences, China University of Geosciences(Beijing), Beijing 100083, China
    2. Ministry of Natural Resources Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
    3. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
  • Received:2021-03-30 Revised:2021-04-09 Online:2021-05-20 Published:2021-05-23

Abstract:

South China is characterized by intensive, large-scale Mesozoic metal mineralization. The mechanism of ore formation during the Yanshanian period has been well studied. Recently, plentiful Triassic deposits have been discovered or recognized in South China, however, few studies are focused on their regional distribution pattern and ore deposit model. In this study, the geological characteristics, spatial-temporal distribution pattern and metallogeny of these Triassic deposits are summarized. So far, forty-six deposits of Late Triassic (230-200 Ma) have been discovered, mostly in five regions of South China. These deposits can be subdivided into four types based on mineralization styles. They, showing a zonal distribution from east to west, are the granite-related W-Sn deposits, the intrusion-related distal Au-Sb deposits, the Carlin-type Au deposits, and the MVT Pb-Zn deposits. The granite-related W-Sn deposits are situated to the south of the Carlin-type Au deposits. Multiple mineralization events took place within a single region as overprinting mineralization in the Indosinian and Yanshanian periods is commonly found in all five regions, and overprinting mineralization in the Caledonian and Indosinian periods was found in the Miaoershan-Yuchengling district of western Nanling and in the Laojunshan district of southeastern Yunan Province.

Key words: Triassic, granite related W-Sn deposits, intrusion-related distal Au-Sb deposit, Carlin-type Au deposit, MVT Pb-Zn deposits, metallogeny, ore deposit model, South China

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