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P-wave velocity imaging and lithosphere structure of the Tibetan plateau
Qu Chen1; Xu Yi2,3; Yang WenCai3; Wang Sheng4; Liu XiaoYu2
2020-03-01
Source PublicationCHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN0001-5733
Volume63Issue:3Pages:847-859
AbstractUsing arrival data from seismic networks in western China, we inverted three-dimensional P-wave velocity structures of the Tibetan plateau and surrounding areas by the body-wave tomography technique. Based on the velocity variation and tectonic features in the crust and lithospheric mantle, our analysis focuses on the lower crust flow, mantle upwelling and lithospheric thinning, and their relations with Cenozoic volcanic activity and the rift system in southern Tibet. The results indicate that the Tibetan plateau is underlain by the low-velocity zones in middle and lower crust, which are distributed in the Lasa and Qiangtang blocks, enlarged to the Songpan-Garze block at the lower crust depth. These low-velocity zones are not interconnected, instead separated by high-velocity zones. This implies that ductile deformation in the mid-lower crust is restricted in tectonically special regions and a large-scale crusal flow could not happen throughout the plateau. Likewise, the mantle upwelling seems not to occur widespread in the Tibetan plateau, only confined to the Qiangtang, Songpan-Garze and eastern Himalayas, which had lead to the thinning of the lithospheric thickness and strong volcanic and magma activities there. Due to the mantle upwelling, which is caused by the subduction of the Indian continental lithosphere, heat flows probably intruded up into the crust. This effect has a significant impact on the formation of Cenozoic volcanic rocks in northern Tibet, the rift system in southern Tibet and the ductile deformation of the middle and lower crust.
KeywordTibetan Plateau P-wave velocity Lithosphere structure Seismic tomography
DOI10.6038/cjg2020N0107
WOS KeywordLOWER CRUSTAL FLOW ; UPPER-MANTLE ; STRUCTURE BENEATH ; SURROUNDING REGIONS ; EASTERN MARGIN ; TOMOGRAPHY ; TIME ; SUBDUCTION ; DEFORMATION ; CONSTRAINTS
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000519847700006
PublisherSCIENCE PRESS
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95482
Collection其他部门
Corresponding AuthorXu Yi
Affiliation1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
3.Zhejiang Univ, Sch Earth Sci, Hangzhou 310027, Peoples R China
4.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 1026, Australia
Corresponding Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Qu Chen,Xu Yi,Yang WenCai,et al. P-wave velocity imaging and lithosphere structure of the Tibetan plateau[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2020,63(3):847-859.
APA Qu Chen,Xu Yi,Yang WenCai,Wang Sheng,&Liu XiaoYu.(2020).P-wave velocity imaging and lithosphere structure of the Tibetan plateau.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,63(3),847-859.
MLA Qu Chen,et al."P-wave velocity imaging and lithosphere structure of the Tibetan plateau".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 63.3(2020):847-859.
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