青海湟中县三岔金矿流体包裹体特征及矿床成因

doi:10.13278/j.cnki.jjuese.201605107

摘要/Abstract

摘要：

三岔金矿位于中祁连新元古代-早古生代中晚期岩浆弧带，是一个陆块与岩浆弧叠置的构造单元。本文在详细的野外矿床地质研究的基础上，开展了与金成矿密切相关的各期流体包裹体岩相学、显微测温、包裹体成分的LRM、碳-氢-氧同位素等方面的分析对比研究工作。结果表明：早期成矿阶段的隐爆石英角砾岩流体包裹体发育气液两相、含子矿物三相和富液相CO₂包裹体，均一温度集中于200~280℃，盐度（w（NaCl））集中于6.00%~18.00%，密度集中于0.64~0.73 g/cm³；主成矿阶段的黄铁绢英岩主要发育气液两相包裹体，均一温度集中于160~240℃，盐度为2.00%~6.00%，密度为0.80~0.95 g/cm³；晚期的石英脉阶段主要发育气液两相包裹体，均一温度主要集中在120~190℃，盐度为2.00%~6.00%，密度为0.76~0.86 g/cm³。碳-氢-氧同位素组成揭示三岔矿床的成矿流体早期主要以岩浆水为主，至演化后期，成矿流体有大气水加入；硫同位素研究反映了成矿物质深源性特征。因此，认为三岔矿床属中温热液脉型矿床。

关键词: 三岔金矿, 热液脉型, 地质构造, 流体包裹体, 青海

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

中图分类号:

P618.51

张延军, 孙丰月, 李碧乐, 李良, 陈扬. 青海湟中县三岔金矿流体包裹体特征及矿床成因[J]. 吉林大学学报(地球科学版), 2016, 46(5): 1342-1353.

Zhang Yanjun, Sun Fengyue, Li Bile, Li Liang, Chen Yang. Fluid Inclusions Characteristecs and Ore Genesis of Sancha Gold Deposit in Huangzhong County, Qinghai Province[J]. Journal of Jilin University(Earth Science Edition), 2016, 46(5): 1342-1353.

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