A Study on Geological Characteristics and Genesis of the Renzhanshi Copper Deposit in the Dongchuan area,Yunnan Province

The Renzhanshi copper deposit in central Yunnan lies in the Proterozoic copper-polymetallic belt of Sichuan and Yunnan Provinces.It is a new resource area explored and exploited by East China Mineral Exploration and Development Bureau for Non-ferrous as well as Yunnan Jinshan Mining,Co.Ltd.This paper mainly presents geological characteristics of the orebody,petrological and mineralogical characteristics of copper ore,mineral formation order and symbiotic,and accountable relationship.Based on these real data of the deposit,and in combination with general comparative study,the genesis of the Renzhanshi copper deposit has been discussed.The study shows that this copper deposit occurs in off-white thick-bedded dolomite of the Qinglongshan Formation,enriched by hydrothermal alteration in the Jinning period after metamorphism of ore beds in a rift sedimentary basin environment of the Middle Proterozoic.It can be attributed to the that is sedimentary-metamorphic superimposed by the hydrothermal alteration type deposit.Therefore,it increases Dongchuan original seam with Qinglongshan formation afterfour stories named the Yinmin formation,Luoxue formation,Heishan formation,and Doushantuo formation,respectively.Obviously,it not only enriches the content of the Dongchuan metallogenic model,but also provides theoretical and scientific basis for further prospecting in this district.