辽宁五龙金矿床地质特征及成矿流体地球化学性质  

The Geological Features and Geochemistry of Ore-Forming Fluids of Wulong Gold Deposit in Liaoning Province

作　　者：王可勇[1] 卿敏[2] 边红业 万多[1] 孙丰月[1] 刘正宏[1] 纪兆家 

机构地区：[1]吉林大学地球科学学院,长春130061 [2]廊坊武警黄金地质研究所,河北廊坊065000 [3]武警黄金第一总队,哈尔滨150086 [4]辽宁省丹东市五龙金矿,辽宁丹东118100

出　　处：《吉林大学学报（地球科学版）》2010年第3期557-564,共8页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(40572117);辽宁丹东三鑫矿业有限公司地质科研项目

摘　　要：对五龙金矿床含金石英脉中发育的流体包裹体进行了系统的岩相学、显微测温及单个包裹体激光拉曼光谱成分分析,结果表明:含金石英脉中主要发育CO2±CH4、H2O-CO2±CH4及气液两相等3种类型的原生流体包裹体;H2O-CO2±CH4包裹体均一温度为287.8～382.5℃,盐度(w(NaCl))为0.42%～4.87%;气液两相包裹体均一温度为198.5～338.4℃,w(NaCl)为2.24%～6.88%;包裹体气相成分以CO2、CH4为主,且含量变化较大。综合分析认为,形成五龙金矿含金石英脉的流体系来源于岩浆的中温、低盐度含CO2流体,在其运移汇集过程中经与围岩反应导致CH4不断加入,而最终演化成为富含CO2、CH4等挥发分的含矿热液。The systematic petrographic,microthermometric as well as laser Raman microspectroscopic studies on fluid inclusions developed in auriferous quartz veins collected from Wulong gold deposit were carried out.The results show that there exist three types of primary fluid inclusions in vein quartz minerals,CO_2±CH_4、H_2O-CO_2±CH_4 and aqueous two-phase respectively.The microthermometric research of different kinds of fluid inclusions reveals that the homogenization temperatures of H_2O-CO_2±CH_4 type fluid inclusions range from 287.8℃ to 382.5℃,the salinities are between 0.42%-4.87%NaCl.The homogenization temperatures of two-phase aqueous fluid inclusions vary from 198.5℃ to 338.4℃,and the salinities between 2.24%-6.88%NaCl.The composition of gaseous phases in there types of fluid inclusions are dominated by CO_2 and CH_4,with largely variable relative content.By comprehensive studies,the conclusion can be drawn that the ore-forming fluid of auriferous quartz veins in Wulong gold deposit belongs to the medium temperature,low salinity and CO_2-bearing solutions.It was derived from magmatic activities and experienced reaction with country rocks during their transportation and accumulation processes,which resulted in the release of CH_4 into solutions and formation of mineralizing fluids enriched in CO_2 and CH_4.

关 键 词：五龙金矿床 地质特征 成矿流体 地球化学 辽宁省 

分 类 号：P618.2[天文地球—矿床学]