气候变化领域集成服务门户(CCPortal): Electrical structure of the middle Qilian Shan revealed by 3-D inversion of magnetotelluric data: New insights into the growth and deformation in the Northeastern Tibetan Plateau

CCPortal

DOI	10.1016/j.tecto.2020.228523
	Electrical structure of the middle Qilian Shan revealed by 3-D inversion of magnetotelluric data: New insights into the growth and deformation in the Northeastern Tibetan Plateau
	Liang H.; Gao R.; Xue S.; Han J.
发表日期	2020
ISSN	00401951
卷号	789
英文摘要	The Qilian Shan is located along the northeastern margin of the Tibetan Plateau, which is a key area for studying the growth and expansion of the Tibetan Plateau. There have been several geodynamic models developed to explain the deformation pattern of the Tibetan Plateau extending to the northeast, but they remain controversial. The magnetotelluric (MT) method can study subsurface electrical conductivity and rheological properties. A dense broadband and long period magnetotelluric (MT) profile across the middle Qilian Shan has been completed. The MT profile starts from the northeastern margin of the Qaidam Basin, crosses the Qilian Shan and Hexi Corridor, and finally reaches the southwestern margin of the Alashan Block. Based on data analysis results, a three-dimensional (3-D) resistivity model of the crust and upper mantle has finally been obtained. The MT results show that a relatively low resistivity zone exists at the bottom of the upper crust of the Qilian Shan, features as an intracrustal decollement, which indicates the decoupling deformation between the upper and lower crust. The isolated conductive bodies in the middle-lower crust of the Qilian Shan may have formed during the primary stage of plateau growth, suggesting that there may be no existence of the middle-lower crustal flow beneath the Qilian Shan. The Alashan Block lithospheric mantle may have partly underthrust southward the Northeastern Tibetan Plateau. The Tibetan Plateau may have grown and expanded northeastward across the Hexi Corridor to the Heli Shan Fault. © 2020 Elsevier B.V.
关键词	Lithospheric electrical structure Magnetotelluric Northeastern Tibetan Plateau Qilian Shan Three-dimensional inversion
英文关键词	Deformation; Magnetotellurics; Electrical conductivity; Electrical structures; Lower crustal flows; Magnetotelluric data; Northeastern tibetan plateaux; Resistivity modeling; Rheological property; Threedimensional (3-d); Geodynamics; data inversion; deformation; electrical conductivity; electrical property; geodynamics; magnetotelluric method; upper crust; China; Qaidam Basin; Qilian Mountains; Qinghai; Qinghai-Xizang Plateau
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207809
作者单位	School of Earth Science and Geological Engineering, Sun Yat-sen University, Guangzhou, Guangdong 510275, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuahai, Guangdong 519000, China; Institute of Geology, Chinese Academy of Geological Science, Beijing, 100037, China; College of Geoexploration Science and Technology, Jilin University, Changchun, 130026, China
推荐引用方式 GB/T 7714	Liang H.,Gao R.,Xue S.,et al. Electrical structure of the middle Qilian Shan revealed by 3-D inversion of magnetotelluric data: New insights into the growth and deformation in the Northeastern Tibetan Plateau[J],2020,789.
APA	Liang H.,Gao R.,Xue S.,&Han J..(2020).Electrical structure of the middle Qilian Shan revealed by 3-D inversion of magnetotelluric data: New insights into the growth and deformation in the Northeastern Tibetan Plateau.Tectonophysics,789.
MLA	Liang H.,et al."Electrical structure of the middle Qilian Shan revealed by 3-D inversion of magnetotelluric data: New insights into the growth and deformation in the Northeastern Tibetan Plateau".Tectonophysics 789(2020).