Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (6): 1578-1590.doi: 10.13278/j.cnki.jjuese.20180209

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H-O-S-Pb Isotopic Geochemistry of Dapinggou Gold Deposit in Northern Altun and Its Implications for Ore Genesis

Lei Ruxiong1, Zhao Tongyang2, Li Ping2, Dong Lianhui2, Li Jihong3, Wu Changzhi4   

  1. 1. College of Earth Science and Resources, Chang'an University, Xi'an 710054, China;
    2. Xinjiang Bureau of Geology and Mineral Resources, Urumqi 830000, China;
    3. Nanjing Center, China Geological Survey, Nanjing 210016, China;
    4. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China
  • Received:2018-08-07 Published:2019-11-30
  • Supported by:
    Supported by National Key R & D Program of China (2017YFC0601203), Project of China Geological Survey (1212011140056) and Fundamental Research Funds for the Central Universities (300102278102)

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Abstract: Dapinggou gold deposit is one of the typical gold deposits in Northern Altun. The deposit is characterized by K-feldspar quartz vein-type and altered rock-type mineralization. The gold mineralization occurs within near the E-W ductile shear zone with the K-feldspar leptynite of Archaean Milan Group as the principal host rock. The ore minerals are mainly pyrite, with minor limonite and natural gold. The measured δ18OVSMOW values for the gold-bearing quartz range from 12.4‰ to 15.3‰, the estimated δ18OH2O fluid values range from 7.4‰ to 10.3‰, and the δDVSMOW values of fluid inclusions in quartz range from-97‰ to -66‰, indicating that the ore-forming fluid is dominated by metamorphic sources. The δ34SVCDT values of sulfide minerals range from 6.9‰ to 8.3‰ in accordance with those of the typical orogenic gold deposits. The 206Pb/204Pb ratios of sulfides range from 18.310 1 to 19.373 9, 207Pb/204Pb ratios from 15.587 2 to 15.654 1, and the 208Pb/204Pb ratios from 38.119 1 to 39.143 9, indicating the lead source of sulfide the same as the orogenic type. It is proposed that Dapinggou gold deposit can be classified as the orogenic gold deposit, the gold formation is controlled by the near EW secondary fault and the ductile shear zone, the metallogenic material is derived from the Archaean metamorphic rocks, and the ore-forming fluids are mainly metamorphic fluids.

Key words: isotopic geochemistry, orogenic gold deposit, Dapinggou gold deposit, northern Altun

CLC Number: 

  • P597
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