A research on the geoelectrical banding characteristics of the bottom of the Mesozoic-Cenozoic basin groups in the Northwest of the Da Hinggan Ling fault

The structures of the Mesozoic-Cenozoic basin groups (Hailar basin, Genhe basin, Mohe basin) lying in the Northwest of the Da Hinggan Ling fault are controlled by the Da Hinggan Ling fault and the Derbugan fault, and the regional tectonic stress field of the Mongol-Okhotsk suture zone in the Northwest of the basin groups, the Xilamulunhe-Yanji suture zone in their southern part, even the movements of the western Pacific plate and the Indian plate far away from the basins and the micro-plates collage zones in the middle and west of Heilongjiang province make a superimposed effect to the bottom of the basin groups, both of which produce the complex deep structure features. Using the geoelectrical structure of the four MT sections (about 1000 km, 94 survey points) carried out along the basin groups in this paper, the banding characteristic of geoelectrical structure of the bottom of the basin groups from Northwest to Southeast is obtained. "The effect of the low electrical resistance" is introduced to describe the change of the physical feature of the basin bottom. The comprehensive analysis shows that the electrical structure of the bottom of the basin groups perhaps continue to evolve by the effect of the asthenosphere hot material.