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Deep electrical resistivity structure across the Gyaring Co Fault in Central Tibet revealed by magnetotelluric data and its implication

文献类型：期刊论文

作者Xue, Shuai1,2,4; Chen, Yun1,2; Liang, Hongda3; Li, Xin1,2; Liang, Xiaofeng1,2; Ma, Xiaobing1,2; Lu, Zhanwu4; Bai, Denghai1,2; Yan, Yongli1,2
刊名TECTONOPHYSICS
出版日期2021-06-20
卷号809页码:10
关键词Conjugate strike-slip fault Rift E-W extension Magnetotellurics (MT) Tibet
ISSN号0040-1951
DOI10.1016/j.tecto.2021.228835
英文摘要As one of the most prominent deformation features on Tibetan plateau, a series of N-S systematic rifts and V-shaped conjugate strike-slip faults are well developed in central-southern Tibet. However the mechanism for the formation of the rifts and conjugate strike-slip faults is still controversial. An east-west trending magnetotelluric (MT) array has been operated across the Gyaring Co Fault (GCF) at the northern end of the Xainza-Dingjye Rift (XDR) in Lhasa block. Three-dimensional (3-D) inversions are employed to image lithospheric resistivity structure. Combined with the previous north-south MT 3-D inversion result, electrical resistivity models reveal obvious conductive layer in the mid-to-lower crust beneath the XDR and apparent resistivity change in the vicinity of the GCF. The calculated depth-integrated conductivity shows that the weak mid-to-lower crust (similar to 30 km- similar to 60 km) characterized by high conductance (>= similar to 10,000 S) and melt fraction of similar to 5-13%, is mainly distributed between the Indus-Yarlung suture (IYS) and the GCF, whereas the relatively rigid crust characterized by low conductance (<= similar to 2000 5) and melt fraction of similar to 2-4% appears to the northeast of the GCF. The weak mid-to-lower crust in southern Tibet and the abrupt difference in the resistivity characteristics of the mid-to-lower crust in the vicinity of the GCF, suggest the formation of the rifts in Lhasa block is closely associated with the weak mid-to-lower crust. Taken together with the upper mantle seismic features, the weak mid-to-lower crust is believed to be attributed to the underplated Indian plate. An alternative geodynamic model is presented to respond to the eastward extrusion during the ongoing N-S convergence between the Indian and Eurasian plates, that the rigid crust in central Tibet is sandwiched by the weak mid-to-lower crust in southern and northern Tibet, and the rifts form above the weak mid-to-lower crust, whereas the conjugate strike-slip faults develop on the rigid crust in central Tibet.
WOS关键词INDIAN LITHOSPHERIC SLAB ; SOUTHERN TIBET ; BENEATH SOUTHERN ; COLLISION ZONE ; PLATEAU ; EXTENSION ; CRUST ; CONSTRAINTS ; DEFORMATION ; SUBDUCTION
资助项目National Natural Science Foundation of China[41804090] ; National Natural Science Foundation of China[41574091] ; National Natural Science Foundation of China[41704099] ; National Natural Science Foundation of China[91962109] ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0701]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000674650000001
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)
源URL[http://ir.iggcas.ac.cn/handle/132A11/101952]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Xue, Shuai
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.Sun Yat Sen Univ, Sch Earth Sci & Geol Engn, Guangzhou 510275, Guangdong, Peoples R China
4.Chinese Acad Geol Sci, Inst Geol, Key Lab Deep Earth Dynam, Minist Nat Resources, Beijing 100037, Peoples R China
推荐引用方式
GB/T 7714		 Xue, Shuai,Chen, Yun,Liang, Hongda,et al. Deep electrical resistivity structure across the Gyaring Co Fault in Central Tibet revealed by magnetotelluric data and its implication[J]. TECTONOPHYSICS,2021,809:10.
APA Xue, Shuai.,Chen, Yun.,Liang, Hongda.,Li, Xin.,Liang, Xiaofeng.,...&Yan, Yongli.(2021).Deep electrical resistivity structure across the Gyaring Co Fault in Central Tibet revealed by magnetotelluric data and its implication.TECTONOPHYSICS,809,10.
MLA Xue, Shuai,et al."Deep electrical resistivity structure across the Gyaring Co Fault in Central Tibet revealed by magnetotelluric data and its implication".TECTONOPHYSICS 809(2021):10.

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来源：地质与地球物理研究所

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