内蒙古乌尼克吐铅锌矿电法异常特征及试验

ELECTRICAL ANOMALY CHARACTERISTICS AND EXPERIMENTAL STUDY OF THE WUNIKETU LEAD-ZINC DEPOSIT IN INNER MONGOLIA

以时间域中梯装置激发极化、偶极—偶极装置相位激电测深和可控源音频大地电磁测深在内蒙古乌尼克吐铅锌矿试验结果为例,验证综合电法在寻找矽卡岩型铅锌矿床中的作用及找矿效果。试验结果表明,在激发极化普查测量中应注意供电电极与异常体之间相互关系,否则会产生虚假异常;在勘查区岩矿石电性条件较好的情况下,激发极化面积测量基本能够反映出异常源平面分布情况。在矿(体)与围岩之间的电阻率差异不明显的条件下,较相位激电测深,可控源音频大地电磁测深基本能够推断出矿体的空间赋存位置。所以,时间域中梯装置激发极化与可控源音频大地电磁测深的电法组合在有色金属矿产勘查中可以发挥更大作用。

In this paper,a time domain induced polarization ladder device,i.e.,the dipole-dipole phase IP sounding device,and CSAMT were employed in the study of the Wuniketu lead-zinc deposit in Inner Mongolia to verify the effectiveness of the comprehensive electrical survey in search for skarn lead-zinc deposits.The results show that,in the measurement of the induced polarization,attention should be paid to the power supply electrode and the relationship between the anomaly bodies,otherwise it will create a false anomaly.In areas with relatively good electrical circumstances of rocks and minerals,the induced polarization area measurement can reflect the abnormal distribution of the sources.Under the condition that the ore body and the rock have not significantly different resistivities,CSAMT sounding can basically better deduce the spatial location of the ore body in comparison with the Phase IP sounding.Therefore,the time domain induced polarization ladder device and the CSAMT electric method can play a greater role in the exploration of nonferrous ore deposits.