Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (5): 1404-1417.doi: 10.13278/j.cnki.jjuese.20200026

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Geochemical Characteristics and Genesis of Jinkengzi Gold Deposit in Wudu Area, Gansu Province

Fan Yuanyuan1, Liu Yunhua1, Yu Xiaofei2, Zhao Qiang3, Li Xiaoyan1, Deng Nan1, Ma Yuanhao1   

  1. 1. School of Earth Science and Resources, Chang'an University, Xi'an 710054, China;
    2. Development and Research Center, China Geological Survey/Mineral Exploration Technical Guidance Center, Ministry of Natural Resources, Beijing 100037, China;
    3. The Third Institute of Geology and Mineral Exploration, Geological and Mineral Exploration and Development Bureau, Gansu Province, Lanzhou 730000, China
  • Received:2020-02-09 Online:2020-09-26 Published:2020-09-29
  • Supported by:
    Supported by General Program of National Natural Science Foundation for Youths (41872219) and Project of China Geological Survey (121201004000172201-48)

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Abstract: Jinkengzi gold deposit is located in the southern sub-belt of west Qinling metallogenic belt in the northern margin of Bikou block. In order to find out the genesis of Jinkengzi gold deposit, the field geological characteristics, hydrogen, oxygen, sulfur isotopic composition, and fluid inclusion characteristics of the deposit were systematically studied. The results show that the ore bodies occur in the unconformity of phyllite and limestone and the fracture zone nearby, which is mainly controlled by the fracture structure; the δDH2O-VSMOW value of quartz in the different mineralization stages ranges from -81.4‰ to -67.5‰, and δ18OH2O-VSMOW ranges from 7.51‰ to 10.55‰, indicating that the early ore-forming fluid was originated mainly from the deep source magmatic water, and added with atmospheric precipitation in the late stage. The δ34S value of pyrite varies from -0.7‰ to 0.6‰, indicating that the ore-forming material is mainly derived from deep magma, with the addition of stratum material. The homogenization temperature of the fluid inclusions is 155.6-304.0 ℃, and the salinity is 0.53%-13.29%, indicating that the ore-forming fluid has the characteristics of medium temperature, medium-low salinity,and rich in CO2. Based on this comprehensive study, it is believed that the genetic type of Jinkengzi gold deposit is a mesothermal vein-type gold deposit formed in the Late Indosinian period.

Key words: geochemistry, fluid inclusion, stable isotopes, genesis of ore deposit, mesothermal vein-typed deposit, Jinkengzi gold deposit, southern sub-belt of west Qinling metallogenic belt

CLC Number: 

  • P618.51
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