Journal of Jilin University(Earth Science Edition) ›› 2023, Vol. 53 ›› Issue (3): 713-727.doi: 10.13278/j.cnki.jjuese.20210430

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 Geochronology of Lengshuigou Cu-Mo-Au Deposit in the Shanyang-Zhashui Area of South Qinling and Its Geological Significance

Chen Lei1, Yan Zhen2, Liu Kai3, Dai Junzhi4, Guo Xianqing5, Nie Xiao5, Pang Xuyong1   

  1. 1. Institute of Mineral Resources, Chinese Academy of Geological Sciences/MNR Key Laboratory of Metallogeny and Mineral 
    Assessment,Beijing 100037, China
    2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
    3. Shangluo No. 713 Party of Northwest Geoexploration Bureau for Nonferrous Metals, Shangluo 726000, Shaanxi, China
    4. Northwest Nonferrous Geology and Mining Group Co., Ltd., Xi’an 710054, China
    5. Chinese Academy of Geological Sciences, Beijing 100037, China
  • Received:2021-12-24 Online:2023-05-26 Published:2023-05-26
  • Supported by:
    Supported by the National Natural Science Foundation of China (41872092), the Project of China Geological Survey (DD20230564, DD20230316) and the National Science and Technology Support Program of China (2011BAB04B05)

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Abstract:  Lengshuigou Cu-Mo-Au deposit is located in the Shanyang-Zhashui ore concentration area, and is one of the representative deposits of the Late Mesozoic porphyry-skarn Cu(Mo) deposits in the South Qinling orogenic belt. In addition to the porphyry-skarn Cu-Mo mineralization, structural-altered rock-type Au mineralization in the Lengshuigou deposit is also developed, but there are always doubts about whether there is a genetic connection between Cu-Mo mineralization and Au mineralization. Therefore, Re-Os dating of molybdenite from the porphyry-skarn Cu-Mo mineralization and 40Ar-39Ar dating of altered potassium feldspar and sericite from structural-altered rock-type Au mineralization were carried out, respectively, in order to be able to pass mineralization ages to determine their genetic relationship between the two mineralization types. The results show that the Re-Os isochron age of molybdenite is (147.4±8.4) Ma, the 40Ar-39Ar ages of the altered potassium feldspar and sericite are 144 Ma, and these ages are consistent within the error range. It indicates that the porphyry-skarn Cu-Mo mineralization and structural-altered rock-type Au mineralization were formed in the Late Jurassic-Early Cretaceous, and they are the products of the same mineralization and magmatic events in the South Qinling orogenic belt. Combined with the regional tectonic evolution, the results show that the Lengshuigou Cu-Mo-Au deposit was formed in the background of the tectonic regime transition of the Qinling orogenic belt during the Late Mesozoic. In addition, the metallogenic epoch of Lengshuigou Au mineralization also shows that the Late Jurassic-Early Cretaceous Au mineralization existed in the South Qinling orogenic belt, which has important indicative significance for regional gold exploration.

Key words:  , Lengshuigou Cu-Mo-Au deposit, Re-Os dating of molybdenite, 40Ar-39Ar dating of altered potassium feldspar and sericite, Shanyang-Zhashui ore concentration area of South Qinling

CLC Number: 

  • P597
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