贵州水城新发现米箩铜矿点地质地球化学特征初步研究

Primary Research of Geochemistry Character to New Copper Ore Spots at Miluo,Shuicheng

本文对水城新发现米箩铜矿点地层、构造、矿石矿物、围岩蚀变等地质特征做了较系统的分析,通过微量元素和稀土元素示踪对成矿物质来源进行了探讨。以上研究结果显示,该铜矿点矿石矿物主要由孔雀石、次为铜蓝组成,矿体呈似层状产于晚二叠世峨眉山玄武岩组的第三段上部气孔状玄武岩中;另外,铜矿点发生过两期矿化,其中晚期的硅化、方解石化成矿作用占主导地位。米箩铜矿点与滇黔交界处玄武岩铜矿的各种地质特征相似,属于典型玄武岩铜矿。

The strata, structure, ore minerals and wallrock alteration of new copper ore spots, situated on Miluo area of ShuiCheng City, have been investigated comprehensively and probed ore-forming material source based on application of trace and REE elements in this paper. The above study results show that the copper ores are com- posed of malachite and minor covellite presenting stratiform-like in vesicular basahs of the third unit of Late Per- mian Emeishan basahs formation. Furthermore, two stages of mineralization have been occurred in these copper ore spots, but the later silicification and calcification dominated over mineralization. The geological features of Miluo copper ore spots are parallel to basahs copper deposits in the adjacent area of Guizhou and Yunnan Prov- inces. Hence, it is a typical basahs copper deposit