内蒙古阿巴嘎旗扎腊地区玄武岩覆盖区激电异常特征及成因探讨

CHARACTERISTICS AND ORIGIN OF IP ANOMALY IN THE BASALT COVERED AREAS OF ZHALA,ABAGA BANNER,INNER MONGOLIA

本文分析探讨内蒙阿巴嘎旗扎腊地区玄武岩覆盖区的激电异常特征及其成因,为在该地区或其他地区开展地球物理勘探提供借鉴。激电中梯测量发现:AB=1600m,激电异常分布与观测段两端;AB=800m,激电异常分布于观测段中段。通过钻孔验证,玄武岩盖层厚度约90m,在其下部有一近似水平层状厚度约60m的含Fe、Mn质结核的风化层。激电中梯测量,AB极长度不同,探测深度不同,是本次激电异常特征变化的成因。

This paper analyses the characteristics and causes of the abnormal excitation of the basalt in the area of the basaltic region of the abga banner,Inner Mongolia,and provides a reference for geophysical exploration in this area or in other areas.The IP ladder measurements show that:AB=1600m,the abnormal distribution of IP and the two ends of the observation section;AB=800m,the IP anomaly is distributed in the middle of the observation section.Through borehole verification,the thickness of the basalt caprock is about 90m,and there is a weathered layer of Fe and Mn nodules approximately 60m in the lower part.In the ip intermediate gradient,the AB pole length is different and the detection depth is different,which is the cause of the variation of the IP anomaly.