EH4在河南北冶隐伏铝土矿床定位预测中的应用

Application of EH4 in the prediction of concealed bauxite deposit in Beiye,Henan

北冶铝土矿为隐伏沉积型铝土矿,周边仅有的地表或浅层铝土矿几乎开发殆尽,在此开展隐伏铝土矿的物探方法试验研究对今后勘查工作具有重要的指导意义。文章介绍了北冶矿区的地质概况和地球物理特征及EH4音频大地电磁测深的基本工作方法,重点介绍了EH4音频大地电磁测深法在北冶矿区铝土矿勘查工作中的应用效果,通过异常解译,划分出了石炭系本溪组含矿岩系与上覆地层及下伏地层之间的地层界面,反映了地层界面的起伏形态,从而间接推断出隐伏铝土矿的赋存状态及空间分布,圈出了含矿有利部位。经后期钻探验证,找矿效果突出。

The Beiya bauxite deposit is a concealed and sedimentary type deposit. The bauxite ore distributed on the surface or in the shallow part are almost mined out, hence, the experimental study of geophysical prospecting approach for prediction of deep con- cealed bauxite deposit, is significant in the deposit area. In this paper, the geological and geophysical characteristics in Beiyc deposit area, and the basic method of EH4 are introduced in detail. Through the anomaly interpretation, the lithological interface between the ore-bearing rock series of Carboniferous Benxi group and the underlying, overlying strata was identified and which reflected the physi- cal shape of the lithological interface. Therefore the occurrence state and spatial distribution of concealed bauxite can be indirectly inferred, and favorable ore-bearing targets were outlined. By test drilling verification, sounding prospecting effect is achieved.