音频大地电磁测深在坦桑尼亚金矿勘查中的应用

为了解研究区内与金矿有关的隐伏断裂构造的空间分布特征,应用音频大地电磁测深对区内隐伏构造进行了探测,结合地质、地球物理资料对剖面进行解释,取得了良好的探测效果和找矿成果。测量结果表明,不同岩性或地层之间存在着电导效应差异,音频大地电磁法能够明显地区分构造矿化蚀变带和围岩,较好地反映异常与已知矿体的关系,构造蚀变岩型金矿床的矿(化)体均处于相对低阻带内,或过渡带(梯度带)上,构造矿化蚀变带在电阻率异常剖面上呈带状分布。此特征为研究区地表和钻探工程的布置提供了强有力的地球物理依据。

Application of audio magnetotelluric sounding in the exploration of gold mine in Tanzania

To understand in research area related to gold deposit concealed the distribution features of the fracture structure, the application of audio magnetotelluric sounding to detect the concealed structures, combined with geological and geophysical data to explain section, good detection effect is obtained. Measurement results show that the conductance effect difference exists between the different lithology and formation, audio magnetotelluric method can clearly distinguish tectonic mineralization alteration zone and surrounding rock, better reflect the abnormal and the known ore body, the relationship between tectonic altered rock type gold deposits in the ore (change) the body are in a relatively low resistance within, or transition zone (gradient belt), mineralized alteration zone on the resistivity anomaly sections in zonal distribution. This feature provides a strong geophysical basis for the layout of surface and drilling engineering in the study area.