基于地球物理数据融合的大兴安岭中段东缘地壳结构研究  

Crustal structure of the eastern margin of the middle Great Kinghan Range based on geophysical data fusion

作　　者：赵维俊[1] 秦涛[1] 李建平 肖锋[3] 韩江涛[3] 荣幸[4] 郭宝东 葛欢 牛兴国 ZHAO Weijun;QIN Tao;LI Jianping;XIAO Feng;HAN Jiangtao;RONG Xing;GUO Baodong;GE Huan;NIU Xingguo(Shenyang Center,China Geological Survey,Shenyang,Liaoning 110034,China;Guangzhou Marine Geology Survey,China Geological Survey,Guangzhou,Guangdong 510075,China;College of GeoExploration Science and Technology,Jilin University,Changchun,Jilin 130026,China;Shanxi Geological Survey Ltd.,Taiyuan,Shanxi 030006,China;Geophysical Measuring Exploration Institute of Liaoning Province,Shenyang,Liaoning 110032,China;Shenyang Research Institute,China Coal Technology and Engineering Group,Shenfu Reform and Innovation Demonstration District,Liaoning 113122,China;Geophysical Exploration Ltd,Inner Mongolia Group of Nonferrous Metals Geological and Mining,Huhehaote,Inner Mongolia 010010,China)

机构地区：[1]中国地质调查局沈阳地质调查中心,辽宁沈阳110034 [2]中国地质调查局广州海洋地质调查局,广东广州510075 [3]吉林大学地球探测科学与技术学院,吉林长春130026 [4]山西省地质调查院有限公司,山西太原030006 [5]辽宁省物测勘查院有限责任公司,辽宁沈阳110032 [6]中煤科工集团沈阳研究院有限公司,辽宁沈抚示范区113122 [7]内蒙古有色地质矿业(集团)物探勘查有限责任公司,内蒙古呼和浩特010010

出　　处：《地质学报》2024年第7期2064-2083,共20页Acta Geologica Sinica

基　　金：中国地质调查局项目(编号DD20190039-07,DD20221632-06,DD20230704);国家留学基金项目(留金项[2019]56号)联合资助的成果。

摘　　要：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-八里罕断裂分开。在大兴安岭中段,这两构造带的位置及板块拼合时间尚不明确。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长60 km的重力、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。Located at the east segment of Central Asian orogenic belt,the Xing'an block and the 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 are hardly to be distinguished.To investigate the structures of the Great Kinghan Range,we have acquired a 60-km-length gravity,magnetic and magnetotelluric coincident profile in Zhalantun-Arongqi area,Inner Mongolia,China.The 1:20000 Buguer gravity data in Zhanlan-Arongqi area were reprocessed.Through multiple geophysical fusions,seven important faults were inferred.Among them,the Pangjiajie fault,the Hongxing fault,and the 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.By correlating with 1:25000 geological mapping data,the geophysical interpretation results were proven.The research outcomes are helpful to geological studies of crustal structures at the central-east Great Kinghan Range margin.

关 键 词：贺根山-黑河缝合带 嫩江断裂 兴安地块 松嫩地块 大地电磁 重力 磁法 数据融合 

分 类 号：P631[天文地球—地质矿产勘探] P542[天文地球—地质学]