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P-wave velocity imaging and lithosphere structure of the Tibetan plateau

文献类型：期刊论文

作者Qu Chen1; Xu Yi3,4; Yang WenCai3; Wang Sheng2; Liu XiaoYu4
刊名CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
出版日期2020-03-01
卷号63期号:3页码:847-859
关键词Tibetan Plateau P-wave velocity Lithosphere structure Seismic tomography
ISSN号0001-5733
DOI10.6038/cjg2020N0107
英文摘要Using 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.
WOS关键词LOWER CRUSTAL FLOW ; UPPER-MANTLE ; STRUCTURE BENEATH ; SURROUNDING REGIONS ; EASTERN MARGIN ; TOMOGRAPHY ; TIME ; SUBDUCTION ; DEFORMATION ; CONSTRAINTS
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000519847700006
出版者SCIENCE PRESS
源URL[http://ir.iggcas.ac.cn/handle/132A11/95482]  
专题地质与地球物理研究所_其他部门
通讯作者Xu Yi
作者单位1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
2.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 1026, Australia
3.Zhejiang Univ, Sch Earth Sci, Hangzhou 310027, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
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.

入库方式： OAI收割

来源：地质与地球物理研究所

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