微细粒金矿床碳质中的纳米金银矿物

Gold and Silver Nanominerals in Carbonaceous Materialof Micrograin Gold Deposite from Guizhou,China

采用分析电镜对我国黔西南微细粒金矿床中分选的碳质体中金的赋存状态进行了研究，结果表明金、银是以纳米级超微矿物形式被包裹在矿石的碳质体中；并且还观察到一种与含金碳质体密切共生的超微黄铁矿晶粒，粒径在２００至８００ｎｍ范围，它们的Ｓ／Ｆｅ原子比接近３：１，而不是实际的２：１，其表面可能吸附有定量硫。此外，对碳质体及其他伴生矿物的特征也进行了分析，并简要讨论了有机质与金的矿化间的关系。提出从“纳米矿物学”角度深入开展卡林型金矿床的成矿机制研究。

Gold occurrence in carbonaceous materials selected from gold ores in micrograin gold deposite in southwestGuizhou Province, China, was studied using analytical electron microscopy. The results show that there existultramicro gold and silver nanometer minerals encapsulated in carbonaceous materials in ores and a kind of ultra-micro pyrite (grain size 200 800nm) associated with carbonaceous material bearing gold which atom ratio of S/Fe is 3 to 1 ,but not as.usual 2 to 1.In addition, the feature of carbonaceous material and other associated min-erals were analysed, the relationship between organic and gold metallization was discussed breifly.It isprosposed to study the mechanism of Carlin type gold deposites by a new approach“Nanomineralogy”.