生物在金矿成矿过程中的作用──以川西北地区东北寨金矿为例

Biomineralization of Dongbeizhai gold Depost in Northwestern

根据沉积学和地层学分析，晚三叠世新都桥组黑色页岩是金矿的矿源层。黑色岩系属于深海相沉积。矿石的地球化学、有机碳分析及水中藻类吸附金的实验表明，金的富集与海洋浮游生物有关。即海洋浮游生物或其变体——有机碳，从古大洋中富集金，后期又经热液改造成矿作用，形成含金矿石。

ccording to sedimentology and stratigraphy,the source bed is late Triassic black shale in Xinduqiao formation,and belongsto abyssal facies.It is indicated,by the andlyses of ore geochmistry,and organic carbon and the experiment of algae absorbinggold in water,that the enrichment of gold is correlated to plankton.Namely,by marine planton or Its variant organic carben,gold was enriched from paleo ocean,and then reformed by hydrothermal solution to form auriferous ores.