中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
A plume-modified lithospheric barrier to the southeastward flow of partially molten Tibetan crust inferred from magnetotelluric data

文献类型:期刊论文

作者Li, Xin2,3; Ma, Xiaobing3; Chen, Yun2,3; Xue, Shuai1; Varentsov, Ivan M.4; Bai, Denghai2,3
刊名EARTH AND PLANETARY SCIENCE LETTERS
出版日期2020-10-15
卷号548页码:9
ISSN号0012-821X
关键词southeastern Tibetan Plateau margin Emeishan mantle plume crustal flow magmatic underplating magnetotellurics electrical conductivity
DOI10.1016/j.epsl.2020.116493
英文摘要Broadband and long-period magnetotelluric (MT) data were used to obtain a continuous image of the lithospheric electrical conductivity structure across the southeastern Tibetan Plateau margin, where long-wavelength crustal thickening and surface uplift have been attributed to the influx of weak crustal material from Tibet into the adjacent Yangtze Block. The resulting resistivity model reveals two major conductive features in the middle-lower crust beneath southeastern Tibet and the Chuxiong basin, both of which are consistent with the presence of fluids and likely enhanced by shear deformation along large faults. The horizontally extensive conductor beneath southeastern Tibet could be interpreted as a partially molten layer that represents topography-driven crustal flow from central Tibet, whereas the anomalously high conductivities observed beneath the Chuxiong basin require the addition of substantial amounts of saline aqueous fluids. These two conductors are separated by a lithospheric-scale, high-resistivity body that situated beneath the geologically inferred core of the Emeishan large igneous province (ELIP). Together with other geophysical and geological evidence, we interpret this anomaly as remnants of a plume-modified lithosphere that originally formed during the Permian Emeishan volcanism, and speculate it acts as an obstruction to the southeastward crustal flow from Tibet since Late Cenozoic. These results indicate that topography-driven crustal flow may contribute to crustal thickening and uplift in southeastern Tibet, but not in the adjacent foreland. Instead, magmatic underplating associated with the Permian plume activity could account for both the elevated topography and thickened crust of the adjacent Yangtze Block without the need for crustal flow. (C) 2020 Elsevier B.V. All rights reserved.
WOS关键词LARGE IGNEOUS PROVINCE ; SOUTHERN TIBET ; EASTWARD EXPANSION ; SE TIBET ; DEFORMATION ; PLATEAU ; BENEATH ; CHINA ; SURFACE ; FLUID
资助项目National Natural Science Foundation of China[41474056] ; National Natural Science Foundation of China[41330212] ; National Natural Science Foundation of China[41274102] ; National Natural Science Foundation of China[41874087]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者ELSEVIER
WOS记录号WOS:000561357200011
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 ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/97661]  
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Bai, Denghai
作者单位1.Chinese Acad Geol Sci, Inst Geol, Key Lab Deep Earth Dynam, Minist Nat Resources, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
4.Russian Acad Sci, Geoelectromagnet Res Ctr, Schmidt Inst Phys Earth, Moscow, Russia
推荐引用方式
GB/T 7714
Li, Xin,Ma, Xiaobing,Chen, Yun,et al. A plume-modified lithospheric barrier to the southeastward flow of partially molten Tibetan crust inferred from magnetotelluric data[J]. EARTH AND PLANETARY SCIENCE LETTERS,2020,548:9.
APA Li, Xin,Ma, Xiaobing,Chen, Yun,Xue, Shuai,Varentsov, Ivan M.,&Bai, Denghai.(2020).A plume-modified lithospheric barrier to the southeastward flow of partially molten Tibetan crust inferred from magnetotelluric data.EARTH AND PLANETARY SCIENCE LETTERS,548,9.
MLA Li, Xin,et al."A plume-modified lithospheric barrier to the southeastward flow of partially molten Tibetan crust inferred from magnetotelluric data".EARTH AND PLANETARY SCIENCE LETTERS 548(2020):9.

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来源:地质与地球物理研究所

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