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Helium and Argon Isotopic Composition in Fluid Inclusions and the Source of OreForming Materials of Denggezhuang Gold Deposit in Jiaodong Peninsula

Xue Jianling1,2, Li Shengrong1, Sun Wenyan1，Zhang Yunqiang1，Zhang Xu1, Liu Chunlan3   

  1. 1.State Key Laboratory of Geological Processes and Mineral Resources, Chinese University of Geosciences，Beijing100083, China;
    2.Development and Research Center of China Geology Survey, Beijing100037, China;
    3. Yantai Muping Gold Deposit, Yantai264109, Shandong, China
  • Received:2012-05-09 Online:2013-03-26 Published:2013-03-26

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Abstract:

Ore genesis and source of ore-forming materials are always be debated in the study of the metallogenic theory and ore prospecting. In the paper, helium and argon isotopic characteristics of the pyrite from five gold ore samples formed in different stages are analyzed. It is showed that the R/Ra ratio in the fluid ranges from 0.008 33 to 3.612 00, with an average of 1.400 00; the 40Ar/36Ar ratio ranges from 465.7 to 4 674.7, the ratio of 4He/40Ar* varies from 0.36 to 1.36. The ratio of the mantle fluid in ore-forming fluid is from 3.73% to 45.87%，average value is 17.67%. Combined with the characteristics of H-O isotope, magmatic rock, wall rock alteration and fluid inclusion etc., it is suggested that ore-forming fluid belongs to the mixture of mantle-derived and crustal-derived fluid. It is mainly derived from the crust, and mixed by the mantle-derived fluid and the small amount of meteoric water in the metallogenic process.

Key words: Denggezhuang, helium and argon isotope, fluid inclusion, crustal fluid, mantle fluid, gold deposit

CLC Number: 

  • P618.51
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