视电阻率测深和音频大地电磁测深在坦桑尼亚某金矿区探测效果的对比分析

隐伏矿产勘查是我国乃至世界现今的主要任务,电阻率测深法和大地电磁测深法是寻找深部矿和隐伏矿的主要工作手段;根据大功率视电阻率测深与音频大地电磁测深在坦桑尼亚某金矿区的实际应用,结合钻孔地质剖面对两者的测量结果反演后进行了对比研究,分析了两种测深方法在构造蚀变岩型金矿上各自的探测效果,研究认为:采用视电阻率测深和音频大地电磁测深可以推测地下构造带电性分布特征、地质结构、构造产状及矿(化)体的赋存空间,音频大地电磁测深对矿区深部构造形态反映效果较好,显示了构造蚀变带的垂向延伸情况;视电阻率测深在反映中、浅部地质体特征方面效果较好,并进一步提高了对大地电磁异常的横向分辨能力,能够为布置钻探工程提供更加充分的依据。

Comparison of the results of apparent resistivity sounding and audio-frequency magnetotelluric sounding in a certain gold mine area,Tanzania

Concealed mineral exploration is the main task of the current our country even in the world,the resistivity sounding method and the electromagnetic sounding method are the main methods for searching for deep and hidden mines. According to the practical application of the high-power apparent resistivity sounding and audio-frequency magnetotelluric sounding in a certain gold mine area, Tanzania, combining with drilling geological section compares the measurement results of both studies, analyses the detection effect of two kinds of sounding methods in tectonic rock type gold deposit. Research suggests that used to the apparent resistivity soundings and audio-frequency magnetotelluric sounding presumably underground characteristics of electrical distribution for tectonic belt, geological structure, structural occurrence and storage space of ore (mineralized) bodies, audio-frequency magnetotelluric sounding reflect the effect is good for deep tectonic, it shows the vertical extension of tectonic alteration belt. Apparent resistivity sounding is effective in reflecting the characteristics of middle and shallow geological bodies,further improved the lateral resolution ability of the electromagnetic anomaly, which can provide a better basis for the decorate of the drilling engineering.