元阳菲莫铜多金属矿床地质特征和成因探讨

Insights into geologic feature and ore genesis of Feimo copper polymetallic depsoit,Yunnan

菲莫铜多金属矿矿床位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.该文通过地质调查和矿床地质特征研究后将矿区阿龙组地层划分为4个岩性段(Pt_1a^1、Pt_1a^2、Pt_1a^3、Pt_1a^4).矿体产在阿龙组第二段大理岩与大皮甲花岗岩接触带附近破碎带及其地层中,矿区内其它地层分布区域未见铜矿化.成矿物质的来源、运移和沉淀受到北东东向断裂构造、岩体和阿龙组第二段地层中大理岩的共同控制,该矿床应为矽卡岩型矿床.

Feimo copper polymetallic deposit is located in the middle section of Ailaoshan medium kata-metamorphic rock belt,where the nappe of Ailaoshan basement metamorphosed highly,east of Dapijia granite during Himalayan epoch.Based on the geological survey and the deposit characteristics,the A'long formation includes four members,including Pt_1a^1,Pt_1a^2,Pt_1a^3,Pt_1a^4.The mineralization is only hosted in the crushed zone near by the contact zone of A'long formation marble and Dapijia granite.The source,transport and sedimentation of metallogenic material are controlled by NEE faults,magmatite and marble in second part of A'long formaition.And the deposit is regard as skarn-type deposit.