Application of Dual Frequency IP method in the exploration of Dujiaqiao lead-zinc mine in Wumeng Mountain area of Guizhou
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摘要: 杜家桥铅锌矿地处贵州乌蒙山区,在基本掌握研究区地质背景与地球物理特征的基础上,开展了物探双频激电法测量工作。介绍了激电中梯和对称四极测深的装置类型及工作方法,并结合研究区地质特征和老硐调查资料,对物探异常进行了推测解译,分析总结了两种方法在杜家桥铅锌矿勘查中的综合应用效果。结果表明: 激电中梯与对称四极测深均能有效获取明显的激电异常; 视电阻率密集梯度变化带应为断裂引起,低阻高极化异常是铅锌矿成矿的有利部位,具有找矿意义。经钻探工程验证,物探推测解释成果与钻探结果吻合较好,说明双频激电法在贵州乌蒙山区铅锌矿勘查中取得了良好的地质效果。Abstract: Dujiaqiao lead-zinc mine is located in Wumeng Mountain of Guizhou. On the basis of geological background and geophysical characteristics, the authors carried out Dual Frequency IP survey in this area. The equipment type and working method of IP middle ladder and symmetrical quadrupole sounding were introduced, and the geophysical anomalies were interpreted combined with geological characteristics and Laodong survey data. And the comprehensive application effect of these two methods was summarized and analyzed during the exploration of Dujiaqiao lead-zinc mine. The results show that the apparent anomalies are obvious in the IP middle ladder survey and symmetrical quadrupole sounding. So the authors deduce that the densely gradient variation of apparent resistivity is caused by the fracture structure, and the low-resistance and high-polarization anomalies are the favorable positions for lead-zinc mineralization, which has an important significance in ore search. The drilling verification indicates that the geophysical prospecting interpretation is in accordance with the drilling results, showing that Dual Prequency IP method is of geological efficiency in lead-zinc mine exploration in Wumeng Mountain.
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