The Geological Features and Geochemistry of Ore-Forming Fluids of Wulong Gold Deposit in Liaoning Province
The Geological Features and Geochemistry of Ore-Forming Fluids of Wulong Gold Deposit in Liaoning Province
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发表时间：
2010
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通讯作者：
JI Zhao-jia
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作者：
JI Zhao-jia
对武隆金矿含金石英脉流体包裹体进行了系统岩相学、显微测温和激光拉曼显微光谱研究。结果表明，脉状石英矿物中存在3种原生流体包裹体，分别为CO_2±CH_4、h2o -CO_2±CH_4和水两相包裹体。不同类型流体包裹体的显微测温研究表明，h2o - co_2±CH_4型流体包裹体的均一温度范围为287.8℃~ 382.5℃，盐度范围为0.42% ~ 4.87% nacl。两相水包裹体均一温度为198.5℃~ 338.4℃，盐度为2.24% ~ 6.88% nacl。两类流体包裹体气相组成均以CO_2和CH_4为主，相对含量变化较大。综合研究认为，武隆金矿床含金石英脉成矿流体属于中温、低矿化度、含co_2溶液。它来源于岩浆活动，在搬运和聚集过程中与围岩发生反应，使CH_4释放到溶液中，形成富含CO_2和CH_4的成矿流体。
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.