The Metallogenetic Geological Characteristics And Prospective Evaluation Of Late Paleozoic Lead-Zinc Deposits, Aqishan In The East Tianshan

The geotectonic structure of the study area belongs to the Junggar block-the Tuha block,the Rottag Carboniferous rift zone.In-band folds and fault structure development,the structure is mainly wrinkled,the eastern section is box-shaped,the western section is closed.The fracture is accompanied by fold growth,and the tectonic activity is relatively strong in the later stage.The tectonic movement is strong,the hydrothermal activity is frequent,and the ore-forming geological conditions are superior.The discovery of the Aqishan lead-zinc deposit enriches the ore-forming series of the metallogenic belt and is of great significance for promoting the prospecting breakthrough of the volcanic-type lead-zinc deposit in the metallogenic belt.The Aqishan lead-zinc mine is a jet-deposited type and is superimposed by a late volcanic hydrothermal superimposed lead-zinc deposit,located in the south of the study area.The ore body is controlled by the NE-oriented sedimentary fault.The ore-bearing rocks are mainly calcareous siltstone and altered tuff or garnet skarn zone.The ore body is layered,layered,lenticular;The ore body is consistent with the formation of the stratum.Synchronous fold deformation of ore body development,tends to be pinpointed to the northeast-southwest and thickness and grade change are relatively stable.The characteristics of the induced polarization exhibit high polarization and low resistivity.The anomalous polarization is NE and NW distribution,completely consistent with the exposed area of the surface ore body.The residual gravity anomaly zone is consistent with the mineralized zone.Geophysical displays are medium-low resistivity,high polarizability,and high-density anomalies.Study area 1: 50,000 cuttings measurements show that main ore-forming elements such as Zn and Pb,the unit has large anomaly scale and has good abnormal strength.Geochemical anomalies show concentrated centers and multiple zoning.According to the mineralization geological conditions in the area.Nineteen comprehensive anomalies with Zn,Pb,Cu,and Ag as main metallogenic elements.Comparative analysis of geological,geophysical and geochemical results of the mining area and the entire study area,abnormal combination of medium and low resistivity,high polarizability,high density and Zn-Pb-Ag.It is the evaluation factor combination of the jet-sedimentary deposit in the study area.Through the study of typical deposits,analysis of metallogenic geological conditions and information extraction of various prediction factors,Establish a geological,geophysical,and geochemical comprehensive information prospecting evaluation model,and define seven prospecting areas and there are four grades A,one grade B,and two grades C.