Geochemical Characteristics And Genesis Analysis Of The Jianshui Su-sui-Yongyang Lead-zinc Deposit, Yunnan

The tectonic position of the east edge in south section of Kangdian Axis "Jianshui-Panxi paleouplift" of Suzu-Muyang Lead-zinc deposit in Jianshui Ynnan.East Xiaojiang fault,South Mile-Shizong fault,overall tectonic line is NNE.More than 10 lead-zinc deposits(points)have been found to form the NE trending ore belt.The Baili anticline runs through the whole territory,of which the Suzu-Muyang Lead-zinc deposit is located in the wings of the.The overall performance for the NNE direction,monocline East tendency.The lead-zinc deposits in this metallogenic belt are concentrated in the dolomite of Qujing group middle devonian.This paper selects the Suzu-Muyang lead-zinc deposit as the research object,mainly through the geological characteristics,fluid inclusions,element geochemistry,isotope geochemistry and so on,and combined with existing data analysis to mineralization,geochemistry of the rent-according to origin of lead-zinc deposits in Suzu-Muyang,this paper achieved the following main results and understandings:1.The lead-zinc deposits in the study area are mainly located in the carbonate rocks of the Middle Devonian Qujing group.The lithology is mainly composed of medium to thick bedded dolomite,limestone and reef limestone.The output of ore body is controlled by structure and stratum.2.The ore mineral composition of primary metal sulfide minerals,mainly galena and sphalerite,For pyrite and chalcopyrite,a small amount of lead;Non metallic minerals are mainly dolomite and calcite,followed by quartz.The country rock alteration is mainly carbonatation.The main structure of the ore consists of fine crystal structure,metasomatic dissolution structure,metasomatic relict structure and granular structure.The main structure of ore mass structure,stockwork structure,scattered disseminated structure,spotted structure.3.The geochemical characteristics of the fluid inclusions show that the ore-forming fluids of the Suzu-Muyang lead-zinc deposit are:medium-low temperature,low salinity,low density NaCl-H2O system,crustal shallow mineralization.4.The sulfur and lead isotopes of Suzu-Muyang lead-zinc deposit show many source characteristics:The source of S is mainly comes from the ore from the ore and the era of carbonate rocks;And the Pb source parameters are closer to the orogenic belt,and some deep matter is mixed,and the lead isotopic composition reflects that the metallogenic metals of the deposit are multi-source..The C-O isotopes in the ore-forming fluids of the Suzu-Myang lead-zinc deposit are dissociated from the marine carbonate rocks.During the process of mineralization,the carbonate rocks act as metal-based carriers in the dissolution-migration-repainting effect.The study of the strontium isotopic studies of single minerals shows that the source of the mineral deposits of the Suzu-Muyang lead-zinc deposit is mixed mainly from the carbonate rocks deposited in each age and flows through the base rock.The metallogenic epoch is roughly equivalent to the late Indosinian early Yanshan period.5.According to Suzu-Muyang lead-zinc deposit geology characteristic structural characteristics of the mineral structure under the microscope,It can be divided into three stages:sedimentary diagenetic period,hydrothermal mineralization stage and supergene oxidation stage.Based on the geochemical characteristics of the deposit and the characteristics of fluid inclusions,it is preliminarily determined that the deposit and the deposit is a mixed hydrothermal lead-zinc deposit.