云南元阳县菲莫铜矿地质特征及找矿前景

Geological Characteristics and Prospecting Potential of Feimo Copper Deposit in Yuanyang County,Yunnan Province

菲莫铜矿位于特提斯成矿域哀牢山铜多金属成矿带中部,处于哀牢山中深变质岩带中段,喜马拉雅山期大皮甲花岗岩体东侧,属于哀牢山基底推覆体高级变质岩区。区内褶皱构造发育,主要为元阳背斜及其次级褶皱构造。断裂构造(F1)呈北北东向展布,为该区的主要的断裂构造。该区广泛的发育长英质岩脉岩浆岩,主要包括燕山期以及喜山期花岗岩脉以及伟晶岩脉等。元古代哀牢山群非莫段是菲莫铜矿矿体的主要赋存部位,黑云母片岩灰白色透辉石大理岩夹浅灰色黑云斜长变粒岩是其主要的岩性特征。矿体产出特点为扁豆状、透镜状和似层状。地层岩性对矿床起着明显的控制作用,构造与热液后期改造,促进了该矿的进一步富集。菲莫铜矿矿源来源不仅来源多,而且具有多期次,多阶段的特点。文中对该矿地质特征进行分析,并在此基础上探讨其找矿前景,旨在为该区同类型矿床的寻找提供有益参考。

Feimo copper deposit is located in the middle part of Ailaoshan copper polymetallic metallogenic belt in Tethys metallogenic domain, in the middle part of Ailaoshan mid-deep metamorphic rock belt, on the east side of Himalayan Dapijia granite body, and belongs to the high-grade metamorphic rock area of Ailaoshan basement nappe. The fold structures in this area are mainly Yuanyang anticline and its secondary fold structures. Fault structure (F1) is the main fault structure in this area, which is distributed in NNE direction. Feldspathic dike magmatic rocks are widely developed in this area, mainly including Yanshanian and Himalayan granite dikes and pegmatite dikes. The Feimo section of the Proterozoic Ailaoshan Group is the main occurrence site of the Feimo copper deposit. The main lithological characteristics of the ore body are the grey diopside marble of biotite schist with light grey biotite plagioclase granulite. The ore bodies are lenticular, lenticular and layered. Stratigraphic lithology plays an obvious role in controlling the deposit. Structural and hydrothermal reformation in later stage promoted the further enrichment of the deposit. The source of Feimo copper deposit is not only multi-source, but also multi-stage and multi-stage. Based on the analysis of the geological characteristics of the deposit, the prospecting prospect of the deposit is discussed in order to provide a useful reference for the prospecting of the same type of deposit in this area.