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石湖地区金、银多金属矿床位于太行山中北段,产出于太古界阜平群变质岩系,燕山期麻棚岩体的周边。本文以石湖地区代表性矿床为例,根据多金属矿床黄铁矿流体包裹体中He、Ar同位素及与黄铁矿共生的石英流体包裹体中C、H、O同位素组成,探讨了石湖地区金、银多金属矿床成矿流体来源。分析结果表明石湖地区金、银多金属矿床黄铁矿流体包裹体中3He/4He介于0.43~2.40 Ra,40Ar/36Ar介于477~879,显示出本区金、银多金属矿床的成矿流体为地幔流体与地壳流体混合的产物。石英包裹体中δDV-SMOW介于-62‰~-105‰,δ18OV-SMOW介于9.6‰~13.8‰,表明成矿流体为岩浆水与大气降水的混合;δ13CPDB介于-3.5‰~-5.0‰,表明矿区成矿热液来自地幔。氢、氧、碳同位素体系与氦、氩同位素体系的示踪具有一致性,均显示出石湖地区金、银多金属矿床成矿流体为地幔流体与地壳流体混合的产物。
The Shihu gold-silver polymetallic deposit is located in the central-northern part of the Taihang Mountains and is produced in the peripheric areas of the Archean Fuping Group metamorphic rocks and Yanshanian Mapeng rocks. In this paper, taking the representative deposits in Shihu area for example, according to the C, H and O isotopic composition of He, Ar isotopes in the fluid inclusions of pyrite in the polymetallic deposits and the quartz fluid inclusions that coexist with pyrite, Regional gold, silver and polymetallic deposits metallogenic fluid source. The results show that 3He / 4He ranged from 0.43 to 2.40 Ra, and 40Ar / 36Ar ranged from 477 to 879 in the fluid inclusions of the pyrite in the gold and silver polymetallic deposits in the Shihu area, indicating that the gold and silver polymetallic deposits in the area are Ore fluid is the product of mixing of mantle fluid and crustal fluid. The δDV-SMOW in quartz inclusions ranged from -62 ‰ to -105 ‰ and the δ18OV-SMOW ranged from 9.6 ‰ to 13.8 ‰, indicating that the ore-forming fluid is a mixture of magmatic water and atmospheric precipitation. The δ13CPDB ranged from -3.5 ‰ to -5.0 ‰, indicating that the mineralization hydrothermal ore from the mantle. Hydrogen, oxygen and carbon isotope systems are consistent with tracer traces of helium and argon isotopes, indicating that the ore-forming fluids of the gold and silver polymetallic deposits in the Shihu area are the product of a mixture of mantle fluids and crustal fluids.