Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (5): 1342-1353.doi: 10.13278/j.cnki.jjuese.201605107

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Fluid Inclusions Characteristecs and Ore Genesis of Sancha Gold Deposit in Huangzhong County, Qinghai Province

Zhang Yanjun, Sun Fengyue, Li Bile, Li Liang, Chen Yang   

  1. College of Earth Sciences, Jilin University, Changchun 130061, China
  • Received:2016-01-10 Online:2016-09-26 Published:2016-09-26
  • Supported by:

    Supported by the National Natural Science Founda of China(41272093)and Geological Survey Projects of China Geological Survey (12120110860202)

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Abstract:

Sancha mining area located Qilian landmass among Qilian orogenic belt, which is a landmass and magmatic arc stacked construction units. It is Neoproterozoic-Early Paleozoic of middle-late stage magmatic arc, sandwiched between North Qilian suture zone and Shulenan Mountain-Laji Mountain suture zone. Based on detailed studies of field deposit geology, through petrography, microthermometry analysis, inclusions constituents LRM analysis, carbon-hydrogen-oxygen isotope analysis and comparison research on the fluid inclusions of each stage closely associated with ore-forming fluids, the results showed that: cryptoexplosive quartz breccia of early mineralization stages has three types fluid inclusions, i.e. gas-liquid two-phase inclusions, daughter minerals-bearing three-phase inclusions and liquid-rich CO2 inclusions. Its homogenization temperatures concentrates in the range of 200-280℃, salinity in the range of 6.00%-18.00% NaCleqv, density in the range of 0.64-0.73 g/cm3. Pyrite phyllic of the main mineralization stage and Quartz veins of late stage mainly has one type fluid inclusions, i.e. gas-liquid two-phase inclusions. The main mineralization stage homogeneous temperature varies from 160 to 240℃, salinity from 2.00% to 6.00% NaCleqv, density from 0.80 g/cm3 to 0.95 g /cm3. Late stage homogenization temperatures concentrates in the range of 120-190℃, salinity in the range of 2.00%-6.00% NaCleqv, density in the range of 0.76-0.86 g/cm3. Carbon-hydrogen-oxygen isotopic composition reveals early ore-forming fluid of Sancha deposits is mainly magmatic water. In the late stage of the evolution, ore-forming fluid is obviously involved the meteoricwater, and sulfur isotope studies reflect that ore-forming material has characteristics of deep source. Therefore, Sancha gold deposit genetic type is mesothermal vein-type deposit.

Key words: Sancha gold deposit, hydrothermal vein type, geological structure, fluid inclusion, Qinghai

CLC Number: 

  • P618.51

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