湘东(北)冷家溪群含金性地球化学评价

湘东（北）冷家溪群Au含量较高，是上部陆壳丰度的1.39倍；地层中的Au主要以硫化物相和有机相等易活动形式存在；地层中的Au呈偏峰和多峰分布，存在后期地质作用的叠加；矿体两侧存在较宽的Au负异常带；矿石、蚀变围岩、正常围岩稀土配分模式高度一致；矿石硫同位素组成与地层的十分接近。故认为冷家溪群为金的矿源层，可为金的成矿提供丰富的成矿物质来源。

Geochemical evaluation for gold bearing capacity of Lengjiaxi group of northeast Hunan

The gold content in Lengjiaxi group of northeast Hunan is higher, 1.39 times over the abundance of the upper crust ; Au in the stratum occurs in some active phases as sulfide and organic phases ; Distribution of Au in the stratum is in deflection peak or multi-peaks;and proved that there were additions of late geological mineralization;There are wide negative zones on both sides of gold ore body;REE pattern of Au ore is much similar to altered adjacent rock and normal adjacent rock ;Isotope compositions of Au ore are approximate to that in the stratum. Thus, the conclusion has been obtained that the Lengjiaxi group is an ore source layer of Au,and is able to provide materials to gold deposit.