石英脉型金矿床的成矿流体研究及思考  

THE RESEARCH AND UNDERSTANDING ON ORE-FORMING FLUID IN GOLD-BEARING QUARTZ VEIN DEPOSITS

作　　者：谭文娟[1] 魏俊浩[1] 郭大招[1] 谭俊[1] 

机构地区：[1]中国地质大学资源学院,湖北武汉430074

出　　处：《地质与资源》2005年第3期227-230,237,共5页Geology and Resources

基　　金：中国黄金集团公司研究项目资助

摘　　要：石英脉型金矿是常见的金矿床类型.金主要以粒间金、裂隙金和包裹金3种形式赋存于石英、黄铁矿等金属硫化物中.目前了解此类金矿的成矿流体组成主要是通过石英中的流体包裹体成分的定量和定性分析结果,揭示矿床成因.但是野外和室内镜下的综合研究已证实,金矿的形成经历了若干个成矿阶段.每个阶段都有石英和金属硫化物形成,而石英要明显早于金属硫化物的结晶,同时金在硫化物中的存在形式多为包裹金和裂隙金,这至少说明金和硫化物同时结晶沉淀或金比硫化物更晚沉淀.因此,金运移沉淀结晶时的流体和石英结晶时的流体存在着明显的时间差,金矿化与黄铁矿等金属硫化物有着密切的联系.研究金属硫化物中的流体包裹体来反映主成矿阶段的成矿流体物质来源,比研究石英中的流体包裹体更具有实际的意义.Gold-beating quartz vein type is common in gold deposits. In this type, gold occurs mainly in quartz, pyrite and other metal sulfides as intergronular gold, fissure-filling gold and wrapped gold. At present, the analytic results from fluid inclusions in quartz are used to understand the composition of ore-forming fluid for this type of deposits. However, it is confirmed by the synthetic studies both in field and laboratory, that the completion of gold deposit covers several ore-forming phases. There are quartz and metal sulfides in e.ach step, and the crystallization of quartz is obviously earlier than that of metal sulfides. What＇s more, the existing of fissure-filling gold and wrapped gold in metal sulfides also indi- cates that the gold deposited at the same time as or even later than the sulfides did. Therefore, there is a time interval between the fluids for gold movement, deposition and crystallization and those of quartz veins. Gold mineralization is closely related to metal sulfides. The researches on the fluid inclusions in metal sulfides from gold-bearing quartz vein deposits are more meaningful to realize the origin of ore-forming maters during the main ore-forming step than on the fluid inclusions in the quartz veins.

关 键 词：石英脉型金矿 成矿流体 流体包裹体 围岩蚀变 

分 类 号：P618.51[天文地球—矿床学]