Geological Characteristics And Gold Prospecting Prospect Of Tuerwa-Wangjiagou Area In Zhenan,Southern Qinling

The Tuerwao-Wangjiagou area is located in the north of the Zhenan-Banyanzhen major fault in the Southern Qinling tectonic belt,and a number of gold deposits have been produced near the Zhenban fault and its secondary fault zone.This paper takes Tuerwao-Wangjiagou area near the Sanguanmiao-Yudongxia secondary fault zone as the research object,and based on previous studies,through field geological survey and drilling cataloging,Systematic research including outcrop sampling,trough sampling,core sampling,combined with geophysical exploration including magnetic method and electrical method,gold-bearing objective observation,geochemical analysis,electron probe analysis and other methods are carried out to determine the relationsh between geological characteristics and gold mineralization,so as to provide help for further prospecting in the study area.Gain the following understanding:Through the field geological investigation and geochemical exploration analysis,the gold mineralization zones in the study area are mainly distributed in different strata and there are great differences.The general trend of the fault zones in this area is NW-SE,with five anticlines developing,and the gold mineralization zones are mainly distributed in Tuerao anticline and Wangjiagou anticline.The gold mineralization anomaly area is mainly distributed in the vicinity of the Sanguanmiao-Yudongxia fault area,which indicates that the Sanguanmiao-Yudongxia fault has a certain control effect on the enrichment of gold elements in the study area,and the gold mineralization zone in Tuerwa area located inside the fault is enriched in the Carboniferous Sixiakou Formation.Gold mineralization in Wangjiagou area,located in the northern part of the fault,is enriched in the second member of the Devonian Jiuling Formation.A total of five fault zones were inferred by magnetic method,and three faults were traced through field tracing,among which CF1 fault was directly related to the gold mineralization zone.The analysis of anomalies shows that the gold mineralization geological body in the study area shows obvious characteristics of high polarizability and low resistivity,and the mesogradient anomaly in the area is obvious,which shows that the anomaly in the southern region near the Sanguanmio-Yudongxia fault zone is very significant,belonging to the medium anomaly area,indicating that the metal sulfide content in the area is relatively high.The anomaly circles three abnormal regions,one of which is consistent with the fracture location inferred by the magnetic anomaly.According to the geochemical test and the quantitative analysis of electron probe,the orebearing surrounding rocks in the study area are mainly quartz brecrecta,carbonaceous and shallow metamorphic siltstone,and the maximum gold grade is close to 6.0g/t and the average grade is close to 0.8g/t,reaching the boundary grade of gold mining.The pyruvite mainly exists in carbonaceous,shallow metamorphic siltstone and quartz granulite.The average content of pyrite S and Fe in different types of samples in the study area is 51.22% and 44.42% respectively,and both Fe and S are in a state of heavy deficit.Combined with Co-Ni-As element graphical analysis,the mineralization type in the study area is close to the characteristics of Carlin-type gold deposits.Based on the characteristics of structure,strata,geochemical anomaly and experimental analysis,the mineralization types in the study area are close to the metallogenic geological characteristics of Carlin-type gold deposits and have good metallogenic potential.