Geological Characteristics And Genesis Of Xiaohe Lead-Zinc Deposit In Qiaojia County,Northeastern Yunnan Province

The Xiaohe lead-zinc deposit is located in the northwestYunnan between the Yangtze block and Kunyang Rift.Tectonic position belongs to Yangtze paraplatform(?)Yunnan dongtai fold belt(?)which is the most important lead-zinc metallogenic area.Xiaohe lead-zinc is a small ore deposits on the Kraal river.For Xiaohe lead-zinc deposit genesis and geology,predecessor research is less.Thus,the research on Xiaohe lead-zinc deposit exploration play a positive role,and help to improve the northeast yunnan lead-zinc metallogenic theory.In this paper,through field geological survey and indoor test and analysis,it has carried on the comprehensive geological characteristics research on The Xiaohe lead-zinc of strata,lithology,structure,mineral composition,alteration and so on.Because of indicating significance to trace element geochemical characteristics of ore-forming environment,wehave studiedthe trace and rare earth elements geochemistry characteristics for wall rock in this paper.Attempting to take advantage of metallogenic environment geochemical method to reveal.There is some conclusions in this paper:1.Find out XiaoHe lead-zinc deposit geological characteristics.The rock types are fine-crystalline dolomite,siliceous fine crystalline dolostone,silica rock and the broken important crystal dolomite so on.And there is tectonic breccia.According to area of output and occurrence,it is divide into three mineralization type:the bedding interface type,the interlayer fracture zone type and fault fracture zone.2.It is incading that sedimentary environment was the reduction of the Marine sedimentary environment in Late Sinian,and it provide part of the ore-forming materials.3.The XiaoHe lead and zinc deposit is a middle-low temperature jucbrothermal type.