伊通盆地西北缘断裂乐山南段电磁异常特征与地质单元

摘要

The aim of the study is to use the CSAMT method to explore the fault-fold belt in the northwestern margin of Yitong Basin.Comprehensive geologic interpretation of the study area is achieved on the basis of the com-bination of the electrical profile obtained from each survey line and the regional geophysical data.The result shows that the study area consists of three geological units, e.g.the Daheishan uplift, the fold belt in the northwestern margin and the Yitong Basin.Two NE-trending faults(F1and F2)and one nearly EW-trending fault(F3)are de-lineated by the electrical profile features.The stratigraphic framework is subsequently defined and tectonic contact between the stratigraphic units is identified.%本文运用可控源音频大地电磁测深(CSAMT)方法对伊通盆地西北缘断褶带进行勘探.将所得的电性剖面与区域地质地球物理资料进行有机结合后,对研究区域进行了综合地质解释,发现研究区由大黑山隆起、西北缘断褶带及伊通盆地三个地质单元构成.通过电性剖面特征共划分出两条北东向的断裂(F1,F2),一条近东西向的断裂(F3),确定了各地层结构,以及地层单元间的接触关系为构造接触.