关键词: 铅锌矿, 区域地质背景, 地质特征, 找矿靶区, 找矿标志

Abstract: Yanjiao lead-zinc deposit is located in Lanping-Simao Mesozoic depression basin in the southern section，which is located in Puer-Jiangcheng depression basin.In order to seek the prospecting breakthrough of the mining area,and speed up the progress of the prospecting work of Yanjiao mining area,based on the geological working results of Yanjiao mining area,the regional geological background,geological characteristics of the mining area,geological characteristics of the ore-bodies and ore characteristics are analyzed in detail,based on the above analysis results,the prospecting indicators are summarized from the aspects of strata,tectonic,alteration and geophysical anomalies,besides that,the prospecting prediction work is also conducted.The study results show that:①according to the filed geological investigation results,the ore-bodies of Yanjiao mining area is mainly hosted in the presence of Cretaceous Lower Cretaceous Jingxing formation,the ore-bearing rock is quartz sandstone and purple,light purple interaction with the argillaceous siltstone;②based on the ore-bearing strata,ore-hosting structure and the geophysical prospecting (induced polarization method and audio-frequency magnetotellurics sounding method) data of apparent chargeability,apparent resistivity and electromagnetic anomalies,the boundary between Cretaceous and Jurassic strata is revised and the four favourable metallogenic belts and four prospecting targe areas are obtained.The above analysis result further indicated that the combination application of induced polarization methd and audio-frequency magnetotellurics sounding method is help for delineating the the deep lead-zine polymetallic mineralization anomaly bodies,it can provide some reference for the prospecting work of the similar deposits.

Key words: Lead-zinc deposit, Regional geological background, Geological characteristics, Prospecting target area, Prospecting indicator