Geological Characteristics and Ore Controlling Factors of Baimachang Lead-zinc Deposit in Northeast Yunnan

Baimachang lead-zinc deposit is located in the midwest of metallogenic belt Northeast Yunnan,which belongs to the Chuan-Dian-Qian adjacent metallogenetic area.Because its northwest side is closely next to an important large-scale lead-zinc deposit in Northeast Yunnan—Maozu lead-zinc deposit,it has great prospecting potential.The degree of geological work is low,and research is already blank.Geological survey and laboratory studies showed that:(1) Ore body mainly hosted in the dolomite,upper section of the Dengying Formation(Z2dn).Qiongzhusi Formation(∈1q) and Yuhucun Formation(∈1y) are good shieldings during the ore-forming fluid migration.(2) According to the output characteristics,ore body is divided into 2 categories: ① stratified,layered ore bodies,mainly sphalerite,and small amounts of galena;② vein orebody,mainly galena,local see sphalerite.(3) Compound ore controlling characteristics of structure(fold,fault) and formation is obvious.All understandings above can provide theoretical basis for exploration,prospecting and research on metallogenic mechanism in this district,also provide supplementary for research on mineralization system of lead-zinc deposits in Northeast Yunnan.