1.Shenyang Center, China Geological Survey;2.Guangzhou Marine Geology Survey, China Geological Survey;3.College of GeoExploration Science and Technology, Jilin University;4.Shanxi Geological Survey Ltd;5.Geophysical Measuring Exploration Institute of Liaoning Province;6.Shenyang Research Institute，China Coal Technology and Engineering Group;7.Geophysical Exploration Ltd, Inner Mongolia Group of Nonferrous Metals Geological and Mining,
位于中亚造山带东段的兴安地块和松辽锡林浩特地块被晚古生代贺根山-黑河缝合带分开。随后，大兴安岭与松辽盆地被中新生代嫩江-八里罕断裂所分开。在大兴安岭中段，这两构造带的位置及板块拼合时间是不明确的。为研究大兴安岭中段东缘重要构造断裂、构造单元及结晶基底属性特征，在扎兰屯-阿荣旗地区采集处理一条60 km长 重力、磁法和大地电磁数据，重新处理了1:20万扎兰屯幅、阿荣旗幅区域布格重力异常数据。通过多种地球物理数据融合，解译了7条重要断裂，其中庞家街断裂和红星断裂是控制贺根山-黑河缝合带的深大断裂。北西向阿伦河断裂为深大断裂，至少切割到中地壳。发现了两个中地壳低阻带，其中C2异常解释为贺根山-黑河缝合带。通过1:25万阿荣旗幅地质填图资料，证实了地球物理数据融合的推断结果，为大兴安岭中段东缘构造带演化研究提供了重要支撑。
Sitting in the east segment of Central Asian orogenic belt, Xing’an block and Songliao-Xilinhaote block were separated by the Hegenshan-Heihe suture. Likewise, Xingan block and Songliao block were separated by the Nenjiang Fault subsequently. In the central segment of the great Kinghan Range, these two structures overlap and is hardly to be distinguished. To investigate the important structures, divide the structure units, and determine the depth variation of the basement in the east margin of the great Kinghan Range, we have acquired a 60-km-length gravity, magnetic and magnetotelluric coincident profile in Zhalantun-Arongqi area, Inner Mongolia. The 1:20K Buguer gravity data in Zhanlan-Arongqi area were reprocessed. Through multiple geophysical fusion, seven important faults were inferred. Among them, the Pangjiajie Fault, the Hongxing Fault, and Alunhe Fault are deep faults, at least penetrating up to middle crust. In addition, two low-resistivity belts in the middle curst were revealed, among which, C2 anomaly is interpreted as Hegenshan-Heihe suture. geographically. By correlating with 1:25K geological mapping data, the geophysical interpretation results were proofed. The research outcomes are helpful to geological studies of crustal structures at the central-east great Kinghan Range margin. It has the significant implications for regional revolution history of the two blocks.