山西省义兴寨金矿流体包裹体特征及其地质意义  

Characteristics of fluid inclusions of Yixingzhai gold deposit in Shanxi Province and their geological significance

作　　者：路英川[1,2] 葛良胜[2] 申维[1] 王治华[2] 郭晓东[2] 王梁[1,2] 周传芳[1,3] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]中国人民武装警察部队黄金地质研究所,河北廊坊065000 [3]中国人民武装警察部队黄金部队第三支队,黑龙江哈尔滨150086

出　　处：《矿床地质》2012年第1期83-93,共11页Mineral Deposits

基　　金：全国危机矿山接替资源勘查项目(20089925);国家自然科学基金项目(批准号41172302)的资助

摘　　要：山西省繁峙县义兴寨金矿为一大型石英脉型矿床。对义兴寨矿区金矿石中的流体包裹体进行了岩相学和显微测温研究,结果表明：义兴寨金矿各成矿阶段金矿石中的流体包裹体主要为气液两相的H2O包裹体,其次为纯气相H2O包裹体和含CO2包裹体。激光拉曼探针分析表明,第Ⅰ阶段流体包裹体除SO2特征峰外,还出现了CO2特征峰和C6H6特征峰,第Ⅱ阶段石英中流体包裹体的气相成分伴有一定量的SO2。第Ⅰ阶段包裹体的完全均一温度（均一至液相）为149~384℃,第Ⅱ阶段包裹体的完全均一温度（均一至液相或气相）为151~373℃,富气相包裹体多数在达到均一前发生爆裂,第Ⅲ阶段包裹体的完全均一温度（均一至液相）为246~325℃,第Ⅳ阶段包裹体的完全均一温度（均一至液相）为223~269℃。成矿流体为中温、低盐度的浆控热液,主成矿期发生流体沸腾并在第Ⅱ阶段有不同来源流体混入,后期有大气降水的加入。早期成矿阶段的流体具有深部地壳甚至地幔的特征。The Yixingzhai gold deposit is a large-size quartz-vein type ore deposit.The ore microscopy and measured temperature data of fluid inclusions reveal that inclusions at various ore-forming stages of the Yixingzhai gold deposits are mainly gas-liquid two-phase（H2O or H2O-CO2） inclusions and subordinately pure volatile inclusions.Raman analysis of the fluid inclusions indicates that,in the gaseous phase,SO2,CO2 and C6H6 are existent at ore-forming stage Ⅰ,and SO2 is existent at stageⅡ in addition to water vapor.The homogenization temperatures of ore-forming stage Ⅰare 149~384℃（homogenization to liquid）,and those of stage Ⅱare 151~373℃（homogenization to liquid or gas）.Volatile-rich fluid inclusions are mostly decrepitated before homogenization.The homogenization temperatures of stage Ⅲ are 246~325℃（homogenization to liquid）,and those of stage Ⅳare 223~269℃（homogenization to liquid）.The ore-forming fluids are of the epithermal-mesothermal and low salinity hypothermal system.The ore-forming fluids boiled very impetuously at the main stage,the meteoric water participated the activity during the late stage,and the ore-forming fluids were mixed with other fluids from different sources at stage Ⅱ.The reducibility of the early ore-forming stage fluid came from continental deep crust or the mantle.

关 键 词：地球化学 流体包裹体 成矿流体 义兴寨 山西 

分 类 号：P618.51[天文地球—矿床学]