松辽盆地西边界带深部构造:地电学证据

满洲里-绥芬河地学断面综合研究了松辽盆地西、东边界的构造特征.在由广角地震波速分布所得到的认识基础上,本文利用松辽盆地西边界带附近新实施的大地电磁测深(MT)(约470 km 42个测点)剖面,经过数据处理的二维电性分布,更为详细地表达了西边界带深部构造特征.与满-绥断面研究相近的结果是西边界带的断裂构造表现为作为盆地...

The deep structure of the western boundary belt of the Songliao basin: the geoelectric evidence

The Manzhouli-Suifenhe geoscience transect (GGT) did a comprehensive research on the structure characteristics of the west and east boundary of the Songliao basin. Based on the understanding obtained from the wide-angle seismic velocity distribution, this paper use the 2D geoelectrical distribution along a section (about 470 km, 42 survey points) of magnetotelluric sounding newly carried out near the western boundary of Songliao basin to describe the detailed deep structure feature of the west boundary. Compared with the Manzhouli-Suifenhe geoscience transect, the similar result is that the fault structure of the west boundary shows that the Nenjiang fault as the west boundary of the basin stacks together with the Heihe-Hegenshan suture zone near the earth's surface, and the two faults separate down several kilometers, and the fault of the suture zone tends to the west through the crust, but the Nenjiang fault tends to the east and is perhaps within the crust. The difference from the Manzhouli-Suifenhe geoscience transect is in the structures under the part where the two faults separate. Because of the effect of the complex regional stress field, such as the collision and welding between the Xing'an micro-plate and Songnen micro-plate and the boundary strike-slip fault, the retained lithosphere fragments is divided into the both sides of the Nenjiang fault. The established geological-geophysical interpretation model provides the feasible geological construction process of the western boundary.