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Weak Crust in Southeast Tibetan Plateau Revealed by Lg-Wave Attenuation Tomography: Implications for Crustal Material Escape

文献类型：期刊论文

作者He, Xi2,3; Zhao, Lian-Feng2,3; Xie, Xiao-Bi1; Tian, Xiaobo4,5; Yao, Zhen-Xing2,3
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
出版日期2021-03-01
卷号126期号:3页码:17
关键词crustal material flow dynamic mechanism Indochina Peninsula Lg wave attenuation Q tomography southeastern margin of the Tibetan Plateau
ISSN号2169-9313
DOI10.1029/2020JB020748
英文摘要The continuous convergence between the Indian and Eurasian plates caused massive lithospheric deformation in the Tibetan Plateau and led to excessive crustal material escaping through its southeastern margin. However, the mechanisms that accommodate the escaping materials and whether they intrude into the Indochina Peninsula are continually under debate. Seismic Lg waves mostly propagate within the crust waveguide with an amplitude decay that is sensitive to crustal material properties, such as temperature, partial melting, and fracture. Therefore, Lg attenuation can be a useful indicator of potential crustal material escape. In this study, we developed a high-resolution broadband Lg attenuation model in this region between 0.05 and 10.0 Hz, with the resolution reaching 1 degrees in regions with dense raypath coverage. Prominent low-Q anomalies beneath the southeastern margin of the Tibetan Plateau, correlating with previously observed low velocity, high conductivity and high Poisson's ratio, may indicate possible high temperature and/or partial melting within a relatively weak crust, and suggest a north-south interconnected corridor for gravity-driven material flow. Through our results and other geological and geophysical observations, a dynamic model is suggested here by combining shallow rigid block extrusion and deep viscous crustal flow to explain crustal material escape in the southeastern margin of the Tibetan Plateau. Additionally, neither shallow extrusion nor deep material flow enter the Indochina Peninsula based on the relatively high Q values, which indicate a stronger crust there.
资助项目Special Fund of China Seismic Experimental Site[2016CESE0203] ; Special Fund of China Seismic Experimental Site[2019CSES0103] ; National Natural Science Foundation of China[41630210] ; National Natural Science Foundation of China[41674060] ; National Natural Science Foundation of China[41974054] ; National Natural Science Foundation of China[41974061]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000638091600058
出版者AMER GEOPHYSICAL UNION
资助机构Special Fund of China Seismic Experimental Site ; Special Fund of China Seismic Experimental Site ; Special Fund of China Seismic Experimental Site ; Special Fund of China Seismic Experimental Site ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special Fund of China Seismic Experimental Site ; Special Fund of China Seismic Experimental Site ; Special Fund of China Seismic Experimental Site ; Special Fund of China Seismic Experimental Site ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special Fund of China Seismic Experimental Site ; Special Fund of China Seismic Experimental Site ; Special Fund of China Seismic Experimental Site ; Special Fund of China Seismic Experimental Site ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Special Fund of China Seismic Experimental Site ; Special Fund of China Seismic Experimental Site ; Special Fund of China Seismic Experimental Site ; Special Fund of China Seismic Experimental Site ; 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/132A11/101115]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
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Zhao, Lian-Feng
作者单位1.Univ Calif Santa Cruz, Inst Geophys & Planetary Phys, Santa Cruz, CA 95064 USA
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Evolut, Beijing, Peoples R China
5.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 He, Xi,Zhao, Lian-Feng,Xie, Xiao-Bi,et al. Weak Crust in Southeast Tibetan Plateau Revealed by Lg-Wave Attenuation Tomography: Implications for Crustal Material Escape[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2021,126(3):17.
APA He, Xi,Zhao, Lian-Feng,Xie, Xiao-Bi,Tian, Xiaobo,&Yao, Zhen-Xing.(2021).Weak Crust in Southeast Tibetan Plateau Revealed by Lg-Wave Attenuation Tomography: Implications for Crustal Material Escape.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,126(3),17.
MLA He, Xi,et al."Weak Crust in Southeast Tibetan Plateau Revealed by Lg-Wave Attenuation Tomography: Implications for Crustal Material Escape".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 126.3(2021):17.

入库方式： OAI收割

来源：地质与地球物理研究所

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