坦桑尼亚某金矿的磁力、激电异常特征

坦桑尼亚某金矿是与条带状含铁建造（BIF）有关的隐伏金矿床。为了查明该金矿脉的分布情况，开展了地面高精度磁力勘查。△T异常特征以负异常为主，负异常峰值大于正异常，正异常为伴生异常，总体上反映了BIF在平面上的延伸方向和构造方向特征；激电测深断面异常以视电阻率等值线“下凹”、视极化率等值线“上凸”为表现形式，二者分别反映了断面内的构造位置和BIF形态特征。本区磁力和激电异常对BIF体的隐伏特征反映的均很明显，依据二者的测量成果，进行钻孔定位，指导钻探施工，钻遇了目的层，收到了很好的效果。

MAGNETIC AND INDUCED POLARIZATION ANOMALY CHARACTERISTICS OF A GOLD ORE DEPOSIT IN TANZANIA

The studied gold deposit in Tanzania is a concealed ore deposit associated with BIF.In order to find out the distribution of the gold ore veins,the authors conducted ground high precision magnetic survey.The results show that the ΔT anomalies are mainly negative anomalies,whose peak value is higher than that of positive anomalies,which seem to be associated anomalies.The anomalies basically reflect the extension of BIF in plane and characteristics of the structure.The induced polarization depth measurement along the section shows that the contour lines of apparent resistivity are concave whereas the contour lines of apparent polarizability are convex,respectively reflecting the position of structure along the section and the features of BIF.The magnetic force and induced polarization anomaly in this area display obviously the concealed feature of BIF,and the bed of interest is intersected by drilling.The results are valuable in the deployment of drill holes.