云南江城岩脚铅锌矿地质特征及找矿预测

岩脚铅锌矿床位于兰坪-思茅中生代坳陷盆地南段，普洱-江城坳陷盆地中。为寻求找矿突破，加快江城岩脚矿区探矿工作步伐，结合区内地质工作成果，对区域成矿地质背景、矿区地质特征、矿体特征、矿石特征进行了详细分析，在此基础上总结了地层、构造、蚀变、物探异常等找矿标志并进行了找矿预测。研究结果表明：①矿区矿体均赋存于白垩系下统景星组地层中，赋矿岩石为石英砂岩及紫色、浅紫色交互带的泥质粉砂；②根据赋矿地层、容矿构造以及激电与音频大地电磁测深法测得的视极化率、视电阻率及电磁异常数据修正了白垩系与侏罗系的地层分界线，得到了4条有利的成矿区带并圈定了4个一级异常靶区。上述分析进一步表明，激电法与音频大地电磁测深法的联合应用，可快速圈定深部铅锌多金属矿化异常体，对于寻找同类型矿床有一定的参考价值。

Geological Characteristics and Prospecting Prediction of Yanjiao Lead-zinc Deposit in Jiangcheng County,Yunnan Province

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 summa-rized 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 meth-od) 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 a-nalysis result further indicated that the combination application of induced polarization methd and audio-frequency magnetotel-lurics 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.