| The Naligou lead-zinc mine is located in the Leibo County of Liangshan,Sichuan Province,219 degrees southwest,with a flat distance of 48 km.The administrative division is under the jurisdiction of Ma County,Leibo county.The geographical coordinate(Xi'an 80 coordinate system)is the 103 degree 27 '15 "~103 degree 30' 00" of the east longitude,the north latitude 28 degree 13 '00 "~28 degree 15'",the geotectonic position located in the north section of the phosphorus forming zone on the east edge of the Kang Dian axis,which belongs to the Ningnan-Jinyang-Leibo metallogenic belt.Based on the summary of previous data,this article collects relevant information and field geological surveys(analysis and treatment of measured geological section,old waste chamber,and trial trench),indoor light,and microscopic identification of thin slices.The tectonic background,stratigraphy,tectonics,magmatic rocks,geophysical prospecting,geochemical exploration,and geochemical prospecting of the mining area were used to systematically analyze the geological characteristics and metallogenic geological conditions of the deposit.The ore minerals in the mining area are mainly sphalerite,galenite and pyrite,followed by smithsonite,palite and chalcopyrite limonite.Gangue minerals are: dolomite,quartz,barite,calcite and so on.Through the study of lead-zinc deposits in the region,the identification of ore minerals under the microscope and field observations,the ore structure is mainly disseminated,massive,and vein-like;the ore structure is mainly semi-automorphic—its crystal structure and artifact structure,Explain the residual structure,inlay crystal structure,mining area can be seen dolomitization,silicification and other phenomena.The metallogenic stages were divided into three stages,which were depositional-diagenetic stage,hydrothermal stage,and epigenetic period,and determined the sequence of ore formation.The ore minerals in the mining area are mainly sphalerite,galena and pyrite,and the following are zinc blende,white lead ore,chalcopyrite,limonite and so on.Gangue minerals include dolomite,quartz,barite,calcite and so on.Associated with Ag,associated with galena and sphalerite.Through the observation of ore minerals under microscope,the ore structure is dominated by disseminated,porphyritic and pulse shape,and the ore structure mainly consists of semi-self-shape-its structure,inclusion structure,residual structure and erosion structure,and dolomitization and silicification in the mining area.The metallogenic epoch has been divided into 3 stages: sedimentary,diagenetic,hydrothermal and epigenetic stages,and the order of mineralization is determined.The lithofacies palaeogeographic environment in the study area is a set of tidal mud flat in the Bay tidal flat and intertidal flat sand flat deposits and carbonate rocks.The water body is relatively shallow and the algae are more developed,providing conditions for the aggregation of Pb and Zn.Comprehensive analysis is made on the aspects of layer,shielding layer,and lead and zinc anomalies.Finally,a comprehensive discussion was made on the formation process of mineralization.By comparing the same types of deposits with the same causes,the sources of mineral deposits and hot brines in the deposits were analyzed,and a metallogenic model map was established.Mineralization is roughly divided into two stages.One stage is the initial enrichment of minerals,and the second stage is the activation and migration of minerals and the enrichment of minerals again.Through the consolidation of the soil sample data of the Longwangmiao Formation of the Cambrian and the observation of surrounding rocks,the mineralization information,wall rock alteration,and other prospecting signs were analyzed for prospecting. |
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