Analysis Of Geophysical Characteristics And Prospecting Potential Of Gold Deposits In Nancheng Caitian Area

The Caitian gold mining area is located in the direction of 345° in Nancheng County,Jiangxi Province,about 18 km away.The area is located in the Qinhang metallogenic belt,the south and west ends of the Dexing-Dongxiang polymetallic metallogenic belt,and is a"Au?Ag?W" polymetallic mineral area ".Large-scale gold deposits have been found in the region,such as Mao Pai Gold Mine,Xu Fang Gold Mine,Dafang-Houyuan Silver Gold Mine and so on.In the past ten years,the geological exploration work of gold prospecting has never stopped in Caitian area,but because of the complex geological conditions and the difficulty of prospecting,it has not achieved good prospecting effect.In view of the large exploration depth of geophysical method,which is helpful to find out the distribution of gold ore belt or ore-controlling structure and "blind exploration of depth of attack" in the area covered by thick,the geophysical method is regarded as one of the main prospecting methods in the new round of Caitian gold mine investigation in Nancheng County,and a new breakthrough is made.This paper relies on the special fund project of mineral resources risk exploration outside and outside Jiangsu province —— " general investigation of Caitian gold mine in Nancheng County,Jiangxi Province ",taking the known ore bodies in Caitian gold mining area as the research object,carried out a total of 7.81 km2 range of high-power excitation ladder measurement,and carried out fine high-power excitation bathymetry in key areas with good prospecting potential.Firstly,the geological data,metallogenic geological conditions and ore-controlling factors are analyzed synthetically in Caitian area of Nancheng.Combined with the known geological profile,the geophysical characteristics and mineralization characteristics of the area are analyzed.The results show that the geophysical anomaly identification for gold deposits in this area is low resistance and high polarization.Based on the results,the electrical characteristics of gold deposit(mineralized zone)are summarized by means of direct current excitation polarization method.The results show that the weathered crust gold deposit is characterized by high polarizability,flake-like and non-tectonic distribution in the surface weathering layer,while the metamorphic ? hydrothermal gold deposit has high disk polarizability in the deep structure.Based on the inversion data of the seismic bathymetric profile and combined with the geological characteristics,ore-forming elements and orebody characteristics,the results show that the upper plate of deep F1 structure is the favorable section of metamorphic-hydrothermal gold deposit and the prospect of deep prospecting potential is very good.By means of the ladder measurement and the important part of the electrical shock sounding.five low resistance zones,four polarizability anomaly fields and two prospecting potential zones are delineated,and the geological structure in the zone is modified.At the same time,the prospecting model combining geophysics and geology is discussed,which provides the basis for geological exploration in this area and other similar areas.