The Metallogenic Model And Ore Prediction Of Tungesten Polymetallic Deposit In Fangzhang Area Of Eshan Country,Yunnan Province

The study area is located in the southwestern margin of the Yangtze plate,the southern section of the Xikang Yunnan axis.The Jinning granite is widely exposed in this area.The evolution and differentiation of the granite is closely related to mineralization.It has a good metallogenic geological background.The geological features and ore-bearing properties of e-shan granite are studied and evaluated in this paper.By studying the geology,geophysics and geochemistry information about mineralization in this area,to summarize metallogenic regularity.On this basis,the ore-controlling factors are analyzed,and the prospecting criteria is summarized,the metallogenic model of skarn type tungsten deposit is established,and the ore prediction is carried out,the prospecting forecast area is delineated in the favorable position of mineralization.(1)According to the study of eshan granite,it has experienced a process of high differentiation and evolution.It is formed by the structural background that the extrusional mechanical properties change to the extensional mechanical properties.It is the product of the continental crust that partial melting,and it has the characteristics of high alkali,high potassium,high silicon and peraluminous granite.The region mineralization is closely related to granite intrusion,the structural background of rock formation,rock mass characteristics,emplacement mechanism,characteristics of surrounding rock and near-ore wall rock alterations,all of these may be important factors affecting mineralization.(2)The formation of skarn type deposit is determined by the formation,tectonics,magmatic rocks and physical and chemical conditions of mineralization,the ore body in the study area is mainly distributed in the granite intrusion and the contact zone that carbonate rocks in the large longkou formation of the kunyang group.The magmatic hydrothermal provides heat source for mineralization,and the granite with high ore-forming element background values,which is beneficial to mineralization.The metallogenic structure is mainly the contact zone structure,and the spatial distribution of ore body are controlled by the shape of contact zone,the ore bearing lithology is a typical skarn mineral assemblage,which is the origin of skarn type deposit.(3)The study area is located in the dongchuan-yimen-shiping iron(tungsten-tin)metallogenic area of sichuan and yunnan province.By studying the relationship that stratum lithology,tectonics,magmatic rocks,geophysical anomalies,geochemical anomalies,and mineralization in this study area,both the geophysical anomalies and geochemical anomalies are caused by skarn and ore bearing skarn.Based on this,the metallogenic regularity of the study area is summarized,and the metallogenic time-spatial laws in the study area and the formation rules of tungsten deposit are discussed.(4)Based on the metallogenic regularity and ore-controlling factors in the study area,and the idea that the formation of tungsten deposit in this study area is determined by favorable strata,magmatic rocks and contact zone structure,which a metallogenic model is established.Applied to the mining model,geology and materialized detective work in the favourable part of the metallogenic to carry out ore prediction and make sure that the two forecast areas are identified.