文章摘要
窦光源,刘世宝,祁昌炜,赵伟,谈艳.青海果洛龙洼金矿床流体包裹体研究[J].矿产勘查,2016,7(4):569-574
青海果洛龙洼金矿床流体包裹体研究
Fluid inclusion characteristics of Guoluolongwa gold deposit in Qinghai
投稿时间：2015-09-22  
DOI：
中文关键词: 流体包裹体测温  H-O同位素  东昆仑成矿带  果洛龙洼金矿床  青海
英文关键词: temperature measurement of fluid inclusion, H-O isotope, east Kunlun metallogenetic belt, Guoluolongwa gold deposit, Qinghai
基金项目:
作者单位
窦光源 青海省地质调查局,西宁 810001 
刘世宝 青海省地质调查局,西宁 810001 
祁昌炜 青海省地质调查局,西宁 810001 
赵伟 青海省地质调查局,西宁 810001 
谈艳 青海省地质调查局,西宁 810001 
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中文摘要:
      果洛龙洼金矿位于东昆仑成矿带东段,是以石英脉型为主的大型金矿床。果洛龙洼金矿的形成划分为两个阶段,对两个成矿阶段的石英脉进行了流体包裹体测试和H-O同位素测定。结果表明,果洛龙洼金矿石英脉主要发育两类包裹体,分别为气液两相水溶液包裹体、水溶液-CO2包裹体。其中,第Ⅰ成矿阶段主要发育气液两相水溶液包裹体,均一温度为148～382℃,盐度为14.3％～23.6％NaCleq。第Ⅱ成矿阶段为果洛龙洼金矿床的主成矿阶段,发育水溶液-CO2包裹体,均一温度集中在276～310℃,盐度为3.1％～19.7％NaCleq,成矿流体总体上属于H2O-CO2-NaCl体系,成矿流体具有富CO2的特征。H-O同位素测定结果表明,含金石英脉矿物中的δ18OV-SMOW为15.4‰～16.5‰,δ18OH2O值为4.3‰～5.4‰,δDV-SMOW为-80‰～-104‰。综上认为,果洛龙洼金矿成矿流体主要来自于深部岩浆水,后期大气降水混入,金快速沉淀形成石英脉型矿。
英文摘要:
      The Guoluolongwa gold deposit located in the eastern part of Eastern Kunlun metallogenetic belt, is the large-sized quartz-vein type deposit.The formation of Guoluolongwa gold deposit was divided into two hydrothermal mineralization stages, based on that,temperature measurement of fluid inclusion and H-O isotopic compostion analysis for quartz veins formed in the two mineralization stages were condcuted. The results indicate that two major types of primary fluid inclusions in quartz veins were identified, i.e., two-phase aqueous inclusion and two-phase aqueous CO2 fluid inclusion. The first mineralization stage is mainly characterized with two-phase aqueous inclusion with homogenization temperature from 148℃ to 382℃ and salinity varying from 14.3% to 23.6%. The second mineralization stage is characterized with mainly two phase aqueous CO2 fluid inclusion with homogenization temperature of from 276℃ to 310℃ and salinity varying from 3.1% to 19.7% respectively. The ore-forming fluid generally is CO2-NaCl-H2O hydrothermal system with rich CO2.The gold-bearing quartz vein has the δ18OV-SMOW value from 15.4‰ to 16.5‰, and the δ18OH2O value from 4.3‰ to 5.4‰, and the δDV-SMOW value from-80‰ to-104‰. In conclusion, the ore-forming fluid mainly comes from deep magmatic fluid mixed with the late atmospheric water.The quartz-vein type gold deposit was formed with the quick precipitation of gold element.
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