华北大地电磁测深阵列观测实验与岩石圈导电性快速成像模型  

Experiments of magnetotelluric observation network on North China and lithospheric conductivity structure from fast imaging method

作　　者：OURO-DJOBO SEDIKOU B. 魏文博[1,2,3] 叶高峰[2,3] 金胜[1,2,3] 景建恩[2,3] 姬磊喆 董浩[2,3] 张乐天[2,3] 尹曜田[2,3] 谢成良[2,3] OURO-DJOBO SEDIKOU B.;WEI WenBo;YE GaoFeng;JIN Sheng;JING JianEn;JI LeiZhe;DONG Hao;ZHANG LeTian;YIN YaoTian;XIE ChengLiang(Sta Key Laboratory of Geological Processes and Mineral Resources, Beijing 100083, China;School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China;Geo-detection Laboratory, Ministry of Education of China, Beijing 100083, China)

机构地区：[1]地质过程与矿产资源国家重点实验室,北京100083 [2]中国地质大学(北京)地球物理与信息技术学院,北京100083 [3]地下信息探测技术与仪器教育部重点实验室,北京100083

出　　处：《地球物理学报》2018年第6期2508-2524,共17页Chinese Journal of Geophysics

基　　金：国家深部探测技术与实验研究(SinoProbe)专项下属大陆电磁参数标准网实验研究(SinoProbe-01)项目资助

摘　　要：关于中国大陆岩石圈导电性结构研究越来越引起人们的重视,而目前研究大陆岩石圈导电性结构的主要方法是大地电磁测深(Magnetotelluric sounding).为此,在国家项目"深部探测技术与实验研究(SinoProbe)"专项里开展了"大陆电磁参数标准网实验(SinoProbe-01)"研究,完成了华北1°×1°地理坐标网度的大地电磁测深"标准点"阵列(Array)观测.本文详细论述了华北SinoProbe-01项目1°×1°MT"标准点"阵列观测实验的概况,以及通过精细的MT数据处理和一维Niblett-Bostick变换快速成像,所获取的华北地区岩石圈导电性三维成像模型.在分析华北岩石圈导电性结构特征的基础上,从电性结构角度把华北与邻区岩石圈划分为胶辽、燕山、鲁西、太行—吕梁等低导电性(高电阻率)块体,内蒙古、阿拉善和祁连中等导电性块体和黄淮、鄂尔多斯、秦岭良导电性(低电阻率)块体,进一步从导电性的角度证实了华北克拉通是由多个块体集合而成的观点.The electrical resistivity structure beneath the continent of the Chinese Mainland has triggered worldwide concerns during recent several decades.The main geophysical method ofsurveying electrical structure of continental lithosphere is Magnetotelluric sounding（MT）.Therefore,in the project SinoProbe-01（i.e.,Experimental Study of the Continental Standard Grid of Electromagnetic Parameters）belonging to the national research program SinoProbe（Deep Exploration Tecnology and Experimental Research of China）,we have deployed 1°（Latitude）×1°（Longitude）standard MT array covering the entire North China.In this paper,we introduce the general situation of SinoProbe-01.In addition,we achieved the electrical resistivity structure of lithosphere beneath North China through fine data processing and rapid imaging by 1-D NiblettBostick transform.Based on the analysis of the lithospheric resistivity structure,the lithosphere beneath North China and its adjacent regions can be divided into several high-resistivity blocks（e.g.,Jiaoliao,Yanshan,Luxi and Taihang-Lüliang）,mid-conductivity blocks（e.g.,Inner Mongolia,Alxa and Qilian）and low-resistivity blocks（e.g.,Huanghuai,Ordos,Qinling）.This observation further confirm the previous inference that the North China craton was formed though amalgamation of multiple micro-continental blocks.

关 键 词：华北岩石圈 大地电磁测深“标准点”阵列 Niblett-Bostick变换 导电性结构 构造格局 

分 类 号：P317[天文地球—固体地球物理学] P318[天文地球—地球物理学]