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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H2O、CO2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;206Pb/204Pb为17.934~18.358、207Pb/204Pb为15.654~15.787和08Pb/204Pb为38.247~38.886,具有上地壳源铅特征。
The gold deposit in Pingjiang, Hunan Province, located in the gold mineralization belt in the middle part of Jiangnan Old Continent, is a representative mineral deposit that has made a breakthrough in ore-prospecting in recent years. It is also a typical mining area within the Lengjiaxi Group in northeastern Hunan. By studying trace and rare earth elements, fluid inclusions and lead isotope geochemistry of the Tongyuan-Hehangpo section, the properties and evolution of ore-forming fluids were studied, and the ore-forming fluids and ore-forming sources were discussed. The results show that the light rare earth is enriched and the europium is depleted, and the slope is normal to the right. The trace elements Rb, Pb and Nd are strongly enriched and depleted in Ba, Ce, Sr and Zr. The fluid inclusions are mainly gas-liquid two- The composition of inclusions and inclusions are mainly H2O and CO2. The homogenization temperatures and salinities of the ore-forming fluids are 160-240 ℃ and 4.50-14.14% respectively, which are medium- and low-temperature-medium-low salinity fluids. The 206Pb / 204Pb is 17.934 ~ The 18.358,207Pb / 204Pb ranged from 15.654 to 15.787 and the 08Pb / 204Pb ranged from 38.247 to 38.886 with upper lead source lead characteristics.