摘要
东川铜矿床位于云南省东北部,其大地构造位置是康滇地轴南段东缘。区内广泛出露前寒武系昆阳群,主要是地槽型碳酸盐岩、泥质岩建造。矿体主要赋存于中昆阳亚群落雪组下部的砂泥质白云岩、含藻白云岩中,呈层状(包括似层状、透镜状)和脉状产出。层状矿体受落雪组的岩性(不纯白云岩)和岩相(潮坪碳酸盐岩相)控制:而脉状矿则产于构造裂隙中,与层状矿密切相关。层状矿为同生沉积——成岩作用的产物;脉状矿是后期地质作用改造层状矿形成。东川铜矿床为典型的复合成因的层控矿床,其矿源层是落雪组下伏的因民组紫色砂泥质白云岩夹白云质板岩。
The doungchung copper deposit is a typical strata-bound deposit. The total content of MgO+CaO+CO_2 is from 40 percent to 65 percent and SiO_2+Al_2O_3 from 20 percent to 40 percent in the ore-bearing rocks. Trace elements data shows that the metallogonic substance is of the same source with strata. Organic matter played an important role during migration and enrichment of copper. The ore-forming fluid, having high salinity, riching in K^+, Na^+, Ca^(2+), CI^-, SO_4^(2-), coming from meteoric water, is of hot brine.
出处
《云南地质》
1989年第3期230-238,共9页
Yunnan Geology
基金
国家自然科学基金
