甚低频电磁法在萤石矿床勘查中的应用——以内蒙古林西俄力木台萤石矿为例

摘要

In the difficulty of prospecting fluorite deposits,it is very urgent to look for a method to predict concealed/half-concealed fluorite deposits in grasslands.As a portable geophysical prospecting method,the VLF-EM method is effective in looking for superficial fault zone.In this paper the application of VLF-EM in the location prediction of concealed/half-concealed fluorite deposit is introduced with the case of Elimutai fluorite in Linxi,Inner Mongolia.The horizontal distribution and occurrence of the anomalies are analysed after a series processing of the VLF-EM data using Fraser filtering and other technologies and the metallogenic belts confirmed in geological study.This study shows that the VLF-EM method is feasible in the location prediction of concealed half-concealed fluorite deposits.%随着萤石矿找矿难度的加大,如何在浅覆盖区寻找、定位隐伏-半隐伏萤石矿体显得尤为迫切.以内蒙古林西俄力木台萤石矿为例,探讨了甚低频电磁法(VLF-EM)在隐伏-半隐伏萤石矿体定位预测研究中的应用.通过对该矿区甚低频数据进行Fraser滤波等技术处理,分析了矿区基本构造格局特征、异常体平面分布和产状特征,并结合矿区地质研究,圈出了7条成矿异常带.实践表明甚低频电磁法在萤石矿隐伏-半隐伏矿体定位预测研究中是可行的.