| 青海湟中县三岔金矿流体包裹体特征及矿床成因 |
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| 引用本文： | 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. |
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| 作者姓名： | 张延军 孙丰月 李碧乐 李良 陈扬 |
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| 作者单位： | 吉林大学地球科学学院, 长春 130061 |
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| 基金项目： | 国家自然科学基金项目(41272093)，中国地质调查局地质大调查项目(12120110860202)Supported by the National Natural Science Founda of China (41272093) and Geological Survey Projects of China Geological Survey (12120110860202) |
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| 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。
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| 关 键 词： | 三岔金矿 热液脉型 地质构造 流体包裹体 青海 |
| 收稿时间： | 2016-01-10 |
Fluid Inclusions Characteristecs and Ore Genesis of Sancha Gold Deposit in Huangzhong County,Qinghai Province |
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| 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 Unviersity:Earth Science Edition,2016,46(5):1342-1353. |
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| Authors: | Zhang Yanjun Sun Fengyue Li Bile Li Liang Chen Yang |
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| Institution: | College of Earth Sciences, Jilin University, Changchun 130061, China |
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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. |
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| Keywords: | Sancha gold deposit hydrothermal vein type geological structure fluid inclusion Qinghai |
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