云南东川因民铜矿金矿化特征及成因初探

GOLD MINERALIZING CHARACTERISTICS AND GENESIS OF YINMIN COPPER DEPOSIT

因民铜矿发育两种金矿化类型:一是铜矿的伴生金;二是热液构造蚀变岩型。化探样品分析结果显示,金矿化主要赋存于金箔箐断层上、下盘的角砾状蚀变岩内,空间上受岩性和断裂构造的双重控制。邻区拖布卡金矿的成矿地质背景与本区相似,在成矿地质年代上作以类比推测,认为喜马拉雅期是主成矿期。另外通过对光片镜下和化探原生晕样聚类分析研究,发现构造蚀变岩型金矿化具明显的多期多阶段性及热液特征。

There are two types of gold mineralization in Yinmin copper deposit： one is as associated element of copper mineralization. Another is hydrothermal structure-alteration type. The results of sample tests show that gold mineralization were mainly occurred in breccia-shaped alterating rock located on hanging wall and footwall blocks of Jinboqing fault, and were strictly controlled by both lithology and fault. Tuobuka gold deposit has the similar geologic background. So the auther conjecture that Himalayan period is the main mineralizing period by analogy on mineralization age. In addition through making research of lens and sample clusting analysis it is found that gold mineralization have the characteristics of multi-period and multi-stage and hydrothermal alteration.