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YAN Xinyun, JIAO Jiangang, DONG Yibo, et al. Geological Characteristics and Fluid Inclusions of the Wujiawan Gold Deposits in Northern Hanyin, Shaanxi[J]. Northwestern Geology, 2019, 52(4): 182-193.
Citation: YAN Xinyun, JIAO Jiangang, DONG Yibo, et al. Geological Characteristics and Fluid Inclusions of the Wujiawan Gold Deposits in Northern Hanyin, Shaanxi[J]. Northwestern Geology, 2019, 52(4): 182-193.
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Geological Characteristics and Fluid Inclusions of the Wujiawan Gold Deposits in Northern Hanyin, Shaanxi

  • 1. School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shaanxi, China;

  • 2. Key Laboratory of Western Mineral Resources and Geological Engineering, Ministry of Education, Xi'an 710054, Shaanxi, China;

  • 3. Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, MNR, Xi'an, 710054, Shaanxi, China

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  • Received Date: March 31, 2019
  • Revised Date: August 11, 2019
  • Available Online: July 28, 2022
  • Published Date: December 04, 2019
    Graphical Abstract
    • Abstract
  • The Wujiawan gold deposit is an important gold deposit in northern Hanyin, Shaanxi. It is located at the Shiquan-Shenhe thrust-napped ductile shear zone in South Qinling. The field geological study found that the ore-bearing horizon of the Wujiawan gold deposit is the fourth lithological layer (S1m41) of the first lithology section of the Meiziya Formation, and this layer is mainly composed of carbon-bearing sericite schist with siliceous rocks; The structure is mainly composed of two layer ductile shear zones (RFa and RFb), which can roughly distinguish the three-phase structural facies of S1, S2 and S3. In which, S0 is almost completely replaced, and S2 deformation is closely related to gold mineralization. Gold ore body was mainly formed in the ductile shear zone during S2 deformation. Based on geological research, the quartz veins from the Wujiawan Gold Mine can be divided into three phases. The study of fluid inclusions shows that these inclusions are dominated by gas-liquid two-phase inclusions, with rare pure gas phase, pure liquid phase and three-phase inclusions. Their homogeneous temperatures range from 176.8℃ to 344.4℃, which is concentrated at 230~280℃. Their salinity vary from 0.35 wt% to 13.51 wt% and are concentrated in 2~10 wt%. The ore-forming fluid belongs to medium-low temperature and low salinity fluid. The fluid capture depth is 1.38~3.47 km and is concentrated at 1.5~2.8 km, and the mineralization is occurred in the middle and shallow parts. The fluid inclusions of quartz vein in S2 stage are closely related to mineralization, their homogeneous temperatures are mainly concentrated at 240~280℃, which are the fluid in the main ore-forming period. Laser Raman spectroscopy analysis shows that the liquid phase composition of gas-liquid two-phase inclusions is dominated by H2O, containing a small amount of CO2 and CH4. The gas phase components are mainly CO2, followed by CH4, N2 and H2S. The inclusion types are mainly H2O-CO2 system inclusions with rich CO2. Compared to the properties of fluid inclusions in different areas of northern Hanyin, it is found that the homogeneous temperatures of fluid inclusions range from 190℃ to 260℃, and their salinities vary form 6 wt% to 10 wt%, which are beneficial to mineralization.
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