He–Ar Isotopic Tracing of Pyrite from Ore-forming Fluids of the Sanshandao Au Deposit, Jiaodong Area
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This study was funded by Demonstration of Three-Dimensional Prospecting Evaluation for Deep Mineral Resources (Grant No. 2017YFC0601506), Comprehensive study of the whole gold exploration area in Laizhou to Zhaoyuan (2014-7) and Investigation of Mesozoic granites in Jiaodong area and its relationship with gold deposits (2018-19). Field work has been assisted and supported by relevant staff of Sanshandao Gold Deposit. Thanks Liwu Wang and Chunhui Cao from Lanzhou Center for Oil and Gas Resources, Institute of Geology and Geophysics, CAS for sample testing.

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    Abstract:

    The Sanshandao Au deposit is located in the famous Sanshandao metallogenic belt, Jiaodong area. To date, accumulative Au resources of 1000 t have been identified from the belt. Sanshandao is a world-class gold deposit with Au mineralization hosted in Early Cretaceous Guojialing-type granites. Thus, studies on the genesis and ore-forming element sources of the Sanshandao Au deposit are crucial. He and Ar isotopic analyses of fluid inclusions from pyrite (the carrier of Au) indicate that the fluid inclusions have 3He/4He=0.043–0.21 Ra with an average of 0.096 Ra and 40Ar/36Ar=488–664 with an average of 570.8. These values represent the initial He and Ar isotopic compositions of ore-forming fluids for trapped fluid inclusions. The comparison of H–O isotopic characteristics combined with deposit geology and wall rock alteration reveals that the ore-forming fluids of the Sanshandao Au deposit show mixed crust–mantle origin characteristics, and they mainly comprise crust-derived fluid mixed with minor mantle-derived fluid and meteoric water during the uprising process. The ore-forming elements were generally sourced from pre-Cambrian meta-basement rocks formed by Mesozoic reactivation and mixed with minor shallow crustal and mantle components.

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HAN Zhenyu, YU Xiaowei, LI Shoujun, Tian Jingxiang, WANG Zhongliang, YU Xiaojing, WANG Ligong.2019. He–Ar Isotopic Tracing of Pyrite from Ore-forming Fluids of the Sanshandao Au Deposit, Jiaodong Area[J]. Acta Geologica Sinica(),93(6):1797-1807

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History
  • Received:January 29,2019
  • Revised:March 14,2019
  • Adopted:
  • Online: December 24,2019
  • Published: