Geological And Geochemical Characteristics,with Metallogenic Regularities Of Liu Keng Gold Ore Se Ction Within Shen Ba Area,South Qin Ling

Based on the project of "Geological Survey of Shanxi Shiquan-Xunyang Gold Mine consolidated exploration part in Changgou area in China,this paper picks Liukeng gold deposit in the Shenba area of Hanbin district,Ankang city to be the research object.Analyzing characteristics regarding geology and geochemistry of the deposit,and relationship between magmatic veins and gold mineralization through clarifying geologic and geochemical characteristics of the magmatic veins,as well as isotopic chronology test of the magmatic veins,and geochemical with geochemical characteristics of veins,upon which the metallogenic regularity and ore-controlling factors are summarized,also genetic types of gold deposits are proposed and the favorable target areas are delineated.Following progress and results coming up with:(1)In the north of Hanyin area,there are many new treatments showing up,which can be divided into S1,S2 and S3,the S2 period showed as the most developed one.The overall production mainly happened in northward,and the inclination of different regions is larger.The gold deposits(dots)found in the study area and the surrounding area are closely related to the ductile shear zone.The ore body output of the Liukeng ore section is strictly controlled by DSZ3(RF5).It is considered that the expansion space formed by the mining area is not only beneficial to the fluid and surrounding rock exchange of matter between the material,but also for the activation,migration,enrichment,precipitation provides space as well as physical and chemical conditions.(2)The quartz veins in the study area can be divided into three periods.The quartz vein included in S2 stage shows low temperature and low salinity characteristics.The quartz vein included in stage S3 shows high temperature and relatively high salinity characteristics,the results show that the mineralization should be in the depth of the sub-mineralization depth,and the gold mineralization is closely related to the quartz veins of S2.(3)The pyrite is divided into two types: disseminated and stripped,and the pyrite under disseminated status is of good gold content.It should be the main metallogenic pyrite.The crystal form is dominated by pentagonal dodecahedron The formation environment of pyrite in the metallogenic stage has the characteristics of low temperature,high sulfur fugacity,slow cooling and sufficient material supply.Pyrrhotite shows characteristics of S-rich Fe enrichment,and the combination of trace elements also reflects the complex formation environment of low temperature and fluid composition.(4)In the study area and the surrounding area,multi-S2 surface direction output,the extension length and outcrop width is different from each other.The identification of lithology for the biotite granite.The chemical composition belongs to the series of Al-Alkaline,which is rich in large ion lithophile elements and light rare earth elements.Strong elements and strong incompatible elements.Zircon U-Pb dating results of 176±1.9Ma,representing the granite crystallization age,early diagenetic Yanshan.The diagenetic type is shown as I-type granite,it is concluded that the magmatism is consistent with the metallogenic age,and there is a certain relationship between the magmatic veins and the formation of gold deposits in the region.(5)Based on the study of regional tectonic setting,mineralization characteristics and metal sulfide in Liukeng gold deposit,it is considered that the deposit should be the ductile shear altered rock type gold deposit.(6)The gold ore body and mineralized alteration zone of Liukeng ore section are mostly lenticular and veiny distribution,and have characteristics of southward lateral development.It is suggested that there are other lenticular,veiny ore bodies or mineralized alteration zones in the central space of the exploration line 3-7 and the southern part of the existing orebodies.(7)The gold-rich enrichment sites can be summarized as,toughness shear zone superimposed surface change,rock folds and fine fissure development sites,favorable rock assemblage and lithological conversion interface,wire-like metal sulfide development lot,development or quartz vein intensive development lot,can be used as the area of ore prospecting signs.