河南南阳南召北沟浅覆盖区综合勘查方法及深部找矿预测

Comprehensive exploration method and deep prospecting prediction in Nanzhaobeigou shallow overburden area of Nanyang City,Henan Province

为了寻找一种快速、有效的适合覆盖区找矿的综合方法,在河南省南阳市南召北沟金多金属矿区进行了1∶1万高精度磁法测量、激电中梯剖面及广域电磁测深相结合的地球物理方法实验性研究。结果表明:①1∶1万高磁能反映地质体及断裂构造的展布特征;②激电中梯剖面识别出的低阻高极化带由金属矿化蚀变引起;③广域电磁测深显示出深部异常与矿化蚀变带对应良好。经钻探工程验证,发现了规模较大的铅锌钨矿体。

In order to find a rapid and effective comprehensive method for ore prospecting in overburden area,a 1∶10000 high-precision magnetic survey,a IP mid-gradient profile and a wide-area electromagnetic sounding geophysics were carried out in Nanzhaobeigou gold polymetallic deposit of Nanyang City,Henan Pro-vince.The results show that:①1∶10000 high magnetic survey reflects the distribution characteristics of geological body and fault structure.②The low resistance and high polarization zone identified by the IP mid-gradient profile is caused by mineralization alteration of metals.③Wide-area electromagnetic sounding shows that the deep anomaly corresponds well with the mineralization alteration zone.A large-scale lead-zinc-tungsten orebody has been found through drilling engineering.