可控源音频大地电磁法在凡口铅锌矿中的应用

凡口矿接替资源勘查项目重点在于矿区深部和外围隐伏矿体的勘探，可控源音频大地电磁法（CSAMT）的应用是矿山多种地球物理方法研究中的一种。由于矿区存在严重的人文干扰因素，音频大地电磁法（AMT）对于较深部的地质特征不容易分辨出来，CSAMT较好地解决了这个问题。在无有效的地质剖面的前提下，通过使用GDP--32U在测区成矿靶区布置的4条CSAMT实验剖面，进行物探异常的定性分类解释和地质推断来设计钻孔。截止目前13个钻孔的勘探结果，90％的钻孔均有不同厚度（1～14）m的铅锌铜矿体，初见效果，拓展了矿区深部勘查手段的思路。

Application of Controlled Source Audio--frequency Magnetotelluric Method in Fankou Leadm Zinc Deposit

The exploration of substitute resources of Fankou lead--zinc deposit is the second batch of exploration projects of Mine Crisis Management Office in 2007. This project focu- ses on the effect of the exploration for the hidden ore body in the deep and peripheral mine. The application of CSAMT method is one of the geophysical research methods in mine. As the serious human interference factors, the AMT method can not tell the difference from the deeper geological features, but the CSAMT method can do it well. The four experimen- tal profiles are arranged in the metallogenic target area to prospect the hidden ore body with the GDP-- 32 -- II , which is the American Multi-- function Electromagnetic System, at present which is the mainstream of the instrument in the domestic electrical prospecting, where there are no valid corresponding geological sections. Through the qualitative classifi- cation of geological explanation and inference for geophysical anomaly to design drill holes, as the result of the current core drilling of 13 drill holes, there are different thickness（l~ 14m） of the lead and zinc mine body in the 90% of them. It has shown its preliminary effec-tiveness, which can develop the thought for the deeper mining exploration.