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Tectonic transition revealed by upper mantle heterogeneities and anisotropy of the SE margin of the Tibetan Plateau: Insights into the Cenozoic intraplate volcanisms

文献类型：期刊论文

作者Xiao, Zhuo1,7,8; Sun, Xinlei5; Wang, Jun6,8; Deng, Yangfan6,8; Yang, Jianfeng2; Xu, Min1,3; Gao, Yuan4
刊名TECTONOPHYSICS
出版日期2023-10-20
卷号865页码:10
ISSN号0040-1951
关键词SE Tibetan Plateau Cenozoic volcanism Mantle heterogeneity Radial anisotropy
DOI10.1016/j.tecto.2023.230046
英文摘要The SE margin of the Tibetan Plateau is a key channel for understanding the plateau's evolution. However, the links between mantle dynamics, surface deformation, and associated intraplate volcanism remain elusive. Here, 3D radially anisotropic seismic structures of the upper mantle beneath the SE margin of the Tibetan Plateau are presented based on adjoint waveform tomography using dense arrays. The seismic image shows a prominent tectonic transition along 26 degrees N, characterized by strong heterogeneities. In the north of 26 degrees N, lithospheric delamination is revealed by high-velocity anomalies between the Tibetan Plateau and the Yangtze Craton at the 150-250 km depth, which may drive the early Cenozoic potassic volcanism. In the south of 26 degrees N, asthenospheric flow is suggested by significantly low velocity and positive radial anisotropy at the uppermost mantle, which probably accounts for the late Cenozoic sodic volcanism. We propose that such upper mantle dynamics shape the surface expression of plateau uplift and intraplate volcanism.Plain language summary: The mechanism controlling the growth and volcanism of the Tibetan Plateau remains ambiguous. We present clues from subsurface structures using earthquake seismology. We observe strong heterogeneities of velocity and anisotropy in the upper mantle of the SE margin of the Tibetan Plateau. The results suggest that lithospheric delamination and asthenospheric flow control the generation of the early Cenozoic K -rich volcanism and late Cenozoic Na-rich volcanism, respectively. Our study indicates that tectonic transition might exist in the subsurface of the SE margin of the Tibetan Plateau.
WOS关键词SPECTRAL-ELEMENT SIMULATIONS ; SEISMIC-WAVE PROPAGATION ; BENEATH SOUTHEAST TIBET ; WESTERN YANGTZE CRATON ; LITHOSPHERE ; EASTERN ; CRUSTAL ; TOMOGRAPHY ; SIGNATURES ; COLLISION
资助项目National Natural Science Foundation of China[42104103] ; National Natural Science Foundation of China[41730212]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者ELSEVIER
WOS记录号WOS:001097215100001
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
源URL[http://ir.iggcas.ac.cn/handle/132A11/110686]  
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Sun, Xinlei; Gao, Yuan
作者单位1.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Southern Marine Sci & Engn Guangdong Lab Guangzhou, Guangzhou 511458, Peoples R China
4.China Earthquake Adm, Inst Earthquake Forecasting, Key Lab Earthquake Predict, Beijing 100036, Peoples R China
5.Chengdu Univ Technol, Coll Geosci, Int Ctr Planetary Sci, Chengdu 610059, Peoples R China
6.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China
7.Guangxi Univ Nationalities, Coll Artificial Intelligence, Nanning 530006, Peoples R China
8.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
推荐引用方式
GB/T 7714		 Xiao, Zhuo,Sun, Xinlei,Wang, Jun,et al. Tectonic transition revealed by upper mantle heterogeneities and anisotropy of the SE margin of the Tibetan Plateau: Insights into the Cenozoic intraplate volcanisms[J]. TECTONOPHYSICS,2023,865:10.
APA Xiao, Zhuo.,Sun, Xinlei.,Wang, Jun.,Deng, Yangfan.,Yang, Jianfeng.,...&Gao, Yuan.(2023).Tectonic transition revealed by upper mantle heterogeneities and anisotropy of the SE margin of the Tibetan Plateau: Insights into the Cenozoic intraplate volcanisms.TECTONOPHYSICS,865,10.
MLA Xiao, Zhuo,et al."Tectonic transition revealed by upper mantle heterogeneities and anisotropy of the SE margin of the Tibetan Plateau: Insights into the Cenozoic intraplate volcanisms".TECTONOPHYSICS 865(2023):10.

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来源：地质与地球物理研究所

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