globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2020.228580
论文题名:
High resolution crustal model of SE Tibet from joint inversion of seismic P-wave travel-times and Bouguer gravity anomalies and its implication for the crustal channel flow
作者: Zhao Y.; Guo L.; Guo Z.; Chen Y.J.; Shi L.; Li Y.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 792
语种: 英语
中文关键词: Crustal channel flow ; Crustal model ; Emeishan Large Igneous Province ; Joint inversion ; SE Tibet ; Tengchong volcano
英文关键词: Channel flow ; Gravitation ; Velocity ; Bouguer gravity anomalies ; Emeishan large igneous provinces ; High resolution ; Joint inversion ; Low velocity zones ; Magmatic systems ; Tibetan Plateau ; Uppermost mantle ; Seismic waves ; Bouguer anomaly ; channel flow ; inverse problem ; large igneous province ; P-wave ; three-dimensional modeling ; travel time ; upper crust ; China ; Emeishan ; Qinghai-Xizang Plateau ; Sichuan ; Tengchong Volcanic Field ; Yunnan
英文摘要: We present a high-resolution 3-D crustal model of southeastern Tibetan Plateau (SE Tibet) by joint inversion of local earthquake P-wave travel-times and Bouguer gravity anomalies. The joint inversion improves the resolution compared with travel-time-only tomography and more clearly depicts the spatial distribution of low velocity zones in the crust. Our joint inversion model finds no evidence for crustal channel flow in this part of SE Tibet. However, our velocity model shows three distinct low velocity zones in the mid-crust which are generally associated with the major fault systems that control the deformation of SE Tibet in the Cenozoic. The thick, mafic/ultramafic underplating beneath the Emeishan Large Igneous Province effectively blocks the crustal flow from Tibetan Plateau and the crustal low velocity zone beneath the Luzhijiang Fault and Xiaojiang Fault is more likely due to localized asthenospheric upwelling. At the southern end of Nujiang Fault, the joint inversion model reveals the magmatic system beneath the Tengchong volcano that facilitates melt migration from uppermost mantle to the magma chambers in the upper-to-mid crust. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170750
Appears in Collections:气候变化与战略

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作者单位: Harbin Institute of Technology, Harbin, 150000, China; Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China; School of Geophysics and Information Technology, China University of Geosciences (Beijing), Beijing, 100083, China; Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China

Recommended Citation:
Zhao Y.,Guo L.,Guo Z.,et al. High resolution crustal model of SE Tibet from joint inversion of seismic P-wave travel-times and Bouguer gravity anomalies and its implication for the crustal channel flow[J]. Tectonophysics,2020-01-01,792
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