摘要
位于江南古陆中段金成矿带内的湖南平江万古金，是近年来成矿理论指导找矿取得突破的代表性矿床，也是湘东北赋存于冷家溪群内的典型矿区。通过对童源-和尚坡矿段微量和稀土元素、流体包裹体和铅同位素地球化学分析，研究其成矿流体性质和演化，并探讨矿床成矿流体和成矿物质来源。结果表明：轻稀土富集，铕亏损，为向右平缓倾斜标准化曲线；微量元素为Rb、Pb、Nd强烈富集，亏损Ba、Ce、Sr、zr；流体包裹体主要为气液两相包裹体，包裹体成分以H20、C02为主，成矿流体均一温度、盐度分别为160～240℃，4．50％～14．50％，为中低温．中低盐度的流体；206-Pb／204-Pb为17．934～18．358、207-pb／204-pb为15．654～15．787和08-pb／204-pb为38．247～38．886，具有上地壳源铅特征。
Wanggu gold deposit, Pingjiang Country, Hunan province, located in the central of the Jiangnan Ancient Land, is a representative deposit in Northeast Hunan hosted in Lengjiaxi Group. Based on trace elements and REE, fluid inclusion and micro-therrnometry analyses, and Pb isotopes, the sources of ore-forming fluids were discussed. REE results show that LREE are enriched, with negative Eu abnormal, and Rb, Pb and Nd are enriched, but Ba, Ce, Sr, and Zr are negative. The fluids inclusion results show that there are only gas and liquid phases. Analysis shows that the gas compositions are H20 and CO2. The homogenization temperature and salinity range from 160 ℃ to 240 ℃ and 4.50% to 14.50%, respectively. It is middle-low temperature, middle-low salinity fluid. 206-pb/204-pb ratios range from 17.934 to 18.358; 207-Tpb/204-apb rations range from15.654 to 15.787, and 208-spb/204-apb ratios range from 38.247 to 38.886, indicating that Pb metal in hydrothermal fluids was sourced from the Upper Crust.
出处
《矿物学报》
CAS
CSCD
北大核心
2013年第4期691-697,共7页
Acta Mineralogica Sinica
基金
中国地质调查局项目(1212011120404国家级岩心标本采集及数字化)
关键词
成矿流体
地球化学
童源-和尚坡
平江
ore-forming fluid
geochemistry
Tongyuan-heshangpo Au deposit
Pingjiang County
