综合物探法在银铅矿普查中的应用

摘要

Wei-Ning North Mountains is the most important poly-metallic mine in Ningxia. Previously a lot of ground and shallow ore prospecting were carried out, but with no prominent discovery. In the new round of the census work, the use of the geophysical prospecting method is critical. In research of previous data on the basis of the census area, we used a new method of Large Power Induced Polarization Sounding ( net degree is 160 x 50, the power is 10KW ) combined with Audio Magnetotelluric Sounding method ( EH4 ) ( net degree is 160× 25 ) and measured geological section ( scale for 1:1000 ) to orientate and predict. It marked the ore-induced anomaly and verified by drilling data. Practice has proved that it is a set of practical and effective combinations of geophysical method of finding poly-metallic sulfide deposits, which uses Large Power Induced Polarization Sounding with EH4 Magnetotelluric Sounding.%卫宁北山是宁夏最重要的多金属矿区，以往开展过大量的地面和浅部找矿工作，但均无突出发现。在新一轮普查工作中，新方法的采用至关重要，物探方法的合理应用更为关键。本次普查工作在研究前人资料的基础之上，以普查区重点地段为靶区，首次采用大功率激电测深（网度为160×50,功率为10KW），结合音频大地电磁测深（EH4）（网度为160×25）和实测地质剖面(比例尺为1：1000)进行综合定位预测。圈出了矿致异常,经钻探验证也见到了铅矿层、金银铜多金属矿层，见矿深度和推断的异常深度比较相近，EH4推断的破碎带范围也和钻探验证比较吻合。实践证明，在该区找硫化物多金属矿床，采用大功率激电测深配合EH4大地电磁测深是一套有效实用的组合物探方法。