Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (1): 81-94.doi: 10.13278/j.cnki.jjuese.20190117

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Source of Ore-Forming Materials in Taoyuan Pb-Zn Deposit in Liaoning Province: Characteristics of S and Pb Isotopic Compositions

Lin Chenggui1,2, Yao Xiaofeng1,2, Cheng Zhizhong1,2, Yan Tingjie1,2, Li Shenghui3, Wang Wei3   

  1. 1. Development Research Center, China Geological Survey, Beijing 100037, China;
    2. Mineral Exploration Technical Guidance Center, Ministry of Natural Resources, Beijing 100083, China;
    3. 103 Brigade of Non-Ferrous Geological Bureau of Liaoning Province, Dandong, 118008, Liaoning, China
  • Received:2019-06-02 Published:2021-02-02
  • Supported by:
    Supported by the National Key R&D Program of China(2018YFC0603806) and the Project of China Geological Survey (DD20160052)

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Abstract: Taoyuan Pb-Zn deposit is a newly discovered medium-sized Pb-Zn deposit in the central section of Qingchengzi ore concentration area in eastern Liaoning Province. The orebodies occur in the paleoproterozoic Dashiqiao Formation of Liaohe Group, which is controlled by the strata and fractures obviously. Due to the lack of research on the ore-forming material sources of the deposit, the genesis of the deposit is still unclear. Based on the field investigation and microscopic observation, the S and Pb isotopic characteristics of Taoyuan Pb-Zn deposit were studied in detail. The analysis results of sulfides show that the δ34S values of the sulfides from Taoyuan Pb-Zn deposit range from 3.5‰ to 8.9‰, with an average of 5.5‰, which indicates the characteristics of mantle source sulfur; the Pb isotopic ratios of 206Pb/204Pb are 17.969-18.309, with an average of 18.076; the Pb ratios of 207Pb/204Pb are 15.572-15.669, with an average of 15.617, and those of 208Pb/204Pb are 38.222-38.371, with an average of 38.312. The μ values range from 9.46 to 9.62 (average 9.55), most of them are lower than those of normal Earth. On the Pb isotopic discrimination diagram, the Pb isotopic values are located between the crust and mantle Pb isotopic evolution lines, showing the mixing characteristics of crust and mantle. The S and Pb isotopic compositions of Taoyuan Pb-Zn deposit are similar to those of Qingchengzi Pb-Zn-Au-Ag deposit and Indosinian intrusive rocks, indicating that the ore-forming hydrothermal fluid came from deep magma, but obviously different from those of the Liaohe Group surrounding rocks. It is concluded that Taoyuan Pb-Zn deposit is a magmatic hydrothermal type Pb-Zn deposit, which is related to the deep magmatic fluid activity.

Key words: S and Pb isotopic, source of ore-forming materials, Taoyuan Pb-Zn deposit, Qingchengzi ore concentration area, Liaodong area

CLC Number: 

  • P618.4
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