| Lead-zinc ore is an important strategic mineral resources,the use of an extremely wide range,mainly used in electrical,mechanical,military,metallurgy,chemical industry,light industry and pharmaceutical industry and other fields,in the non-ferrous metal industry occupies an important position.In recent years,although the proven reserves of lead and zinc have increased,few large,high-grade mineral discoveries have been found.Jinding Pb-Zn mine is the largest lead-zinc ore in China's proven reserves,and it is also the largest lead-zinc deposit in Asia,located in Jinding,Lanping County,Yunnan Province,about 3.5 kilometers away from Lanping County.Based on the national project"Geophysical Exploration and three-dimensional physical structure of jinding mining area",this paper uses audio magnetotelluric Exploration(AMT)and gravity to carry out 30km audio magnetotelluric and 60km~2 high-precision gravity data acquisition,processing and interpretation work in jinding mining area.The following results were obtained through analytical research:1,the study area of rock ore physical characteristics:In terms of resistivity,block,pulse sulfide lead-zinc ore is the lowest resistivity body in the mining area,4-300 times lower than other rock(ore)stone resistivity value,with obvious low resistivity characteristics;the resistivity of impregnated lead-zinc oxide ore is 5-10times lower than that of sandstone and limestone,which shows the characteristics of medium and low resistivity.In terms of density,ore,in addition to water and zinc ore,is about high 1g/cm~3,characterized by high density.in terms of polarization rate,lead-zinc oxide ore,lead-zinc sulfide ore and other rocks are about 3%higher,showing high polarization characteristics.2,the formation physical characteristics of the study area is:Resistivity,The Yunlong group is dominated by gravel ore-bearing strata,the resistivity is the lowest,the average resistivity is only 60?·m,and the resistivity of the Triad group with limestone is the highest is greater than 2000?·m,and the other strata are characterized by medium and low resist ance.Density,The strata from new to old density gradually become larger,the Cenozoic stratigraphic density is the lowest,the average density is less than 2.50g/cm~3,the Triassic Triad Group limestone formation density is higher than the average density 2.70g/cm~3,the ore-bearing formation Yunlong group and the View Star group density is relatively high,the average density of the Yunlong group can reach 2.70g/cm~3.3,The fault physical response characteristics of the study area are as:in the AMT inversion resistivity section diagram,the performance is the transverse mutation of the resistivity profile and the contour distortion phenomenon,and the fault is reflected in the gravity anomaly curve for the gravity gradient band to appear the extreme value.4,the study area ore body response characteristics are:Resistivity profile on the performance of low resistance anomaly,the remaining gravity anomaly is shown as high gravity.5,A comprehensive analysis of 4 section 11 abnormal areas was carried out,and 4 prospecting prediction areas were identified. |
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