| 黑龙江省漠河县砂宝斯金矿床流体特征及矿床成因 |
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| 引用本文： | 李良,孙丰月,李碧乐,钱烨,许庆林.黑龙江省漠河县砂宝斯金矿床流体特征及矿床成因[J].地球科学,2015,40(7):1163-1176. |
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| 作者姓名： | 李良 孙丰月 李碧乐 钱烨 许庆林 |
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| 作者单位： | 1.吉林大学地球科学学院, 吉林长春 130061 |
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| 基金项目： | 中国地质调查局项目，国家自然科学基金项目 |
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| 摘 要： | 成因类型与控矿条件的不确定一直是制约砂宝斯金矿床找矿突破的关键因素.就成矿背景而言, 多数学者认为其形成于造山过程的挤压背景, 而是否与伸展构造体系有关则鲜有研究.为重新确定砂宝斯金矿床的成因类型, 在详实的野外调研基础上, 对该矿床的控矿构造、成矿流体特征、成矿物质来源等方面展开深入研究.结果表明, 矿床受大型拆离断层控制, 矿体主要赋存于拆离断层的次级张性断裂中.通过扫描电镜首次发现了含砷黄铁矿, 与毒砂、黄铁矿共生于早阶段, 指示该矿床形成于中温或中温偏高的热液环境.石英中流体包裹体较为发育, 以气液两相为主.主成矿阶段流体具有中温(峰值为200~260℃)、低盐度(平均值为5.56% NaCl equiv.)、低密度(平均值为0.87g/cm3)的特征.成矿流体气相成分主要为H2O、CO2与CH4, 属于H2O-CO2-CH4体系.硫主要来自深源岩浆(成矿早阶段黄铁矿δ34S为-1.3‰~5.6‰), 也有少量地层硫.成矿流体盐度随着温度降低而降低, 不同流体混合是成矿物质卸载沉淀成矿的主要机制.综合研究表明, 砂宝斯金矿床的成因类型属受拆离断层控制的中温热液脉型金矿床, 形成于燕山晚期地壳强烈伸展和幔源物质大规模参与地壳演化的构造背景.
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| 关 键 词： | 砂宝斯 拆离断层 成矿流体 中温热液脉型金矿床 矿床地质 |
| 收稿时间： | 2014-07-31 |
Ore-Forming Fluid Features and Genesis of Shabaosi Gold Deposit in Mohe County,Heilongjiang Province |
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| Li Liang,Sun Fengyue,Li Bile,Qian Ye,Xu Qinglin.Ore-Forming Fluid Features and Genesis of Shabaosi Gold Deposit in Mohe County,Heilongjiang Province[J].Earth Science-Journal of China University of Geosciences,2015,40(7):1163-1176. |
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| Authors: | Li Liang Sun Fengyue Li Bile Qian Ye Xu Qinglin |
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| Abstract: | Uncertainty of genesis and ore-controlling condition are always the key restriction of ore-search breakthrough to Shabaosi gold deposit. For the metallogenic background, most scholars believe that it formed in the compressional setting of orogenic process, but few observe that related to the extensional tectonic system. In order to re-determine the genesis of Shabaosi gold deposit, ore-controlling structure, characteristics of ore-forming fluid and source of ore-forming materials are studied in this paper based on the detailed field investigation. The results of the study show that the ore bodies occuring in the tensional fractures are controlled by the large-scale detachment fault. As-bearing pyrite is discovered by SEM for the first time born with arsenopyrite and pyrite in the early metallogenic stage, which indicates that Shabaosi gold deposit formed in mesothermal or slightly meso-hypothermal environment. Fluid inclusions in quartz grains are well developed mainly in gas-liquid phase. The fluid of major metallogenic stage is characterized by moderate homogenization temperature (peak 200-260℃), low salinity (average 5.56 % NaCl equiv.) and low density (average 0.87g/cm3). Bubbles (vapor-phase) of the ore-forming fluid, belonging to H2O-CO2-CH4 system, are mainly composed of H2O, CO2 and CH4. The sulphur are mainly derived from the magma with the δ34S of pyrite in the early metallogenic stage ranges of -1.3‰ to 5.6‰, while a little are from strata. The salinity of ore-forming fluid descends as the temperature reduces. The mixing of different fluids leads the precipitation of ore-forming materials. Comprehensive studies suggest that Shabaosi gold deposit belongs to mesothermal vein gold deposit controlled by detachment fault, which is related to the tectonic setting of intensive crustal extension and the crust evolution involving enormous mantle derived materials in the late Yanshanian period. |
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| Keywords: | Shabaosi detachment fault ore-forming fluid mesothermal hydrothermal vein gold deposit ore deposit geology |
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