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Constraints on upper mantle V-p/V-s ratio variations beneath eastern North China from receiver function tomography

文献类型：期刊论文

作者Si, Shaokun1; Tian, Xiaobo2,3; Gao, Rui1
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2017-05-01
卷号138页码:341-356
关键词North China Craton Pacific Plate Subduction Receiver Function Dehydration Of The Retained Slab Cenozoic Basalt Eruption
ISSN号1367-9120
DOI10.1016/j.jseaes.2017.02.025
文献子类Article
英文摘要To detect the thinning, modification, and replacement of the basement of the lithosphere is a key step in understanding the destruction mechanism of the North China lithosphere. The difference of the basement of the lithosphere is mainly displayed by the variation of the peridotite composition and its physical state. V-p/V-s ratio (hereafter referred to as velocity ratio) is more sensitive to this change than V-p or V-s alone. By means of the strong dependence of the travel-time of the wave converted at the 410-km discontinuity (P410s) observed in the receiver function (RF) on the velocity ratio in the upper mantle, we developed a new mapping method to constrain the velocity ratio between the Moho and 410-km discontinuity. Using the RFs extracted from 246 broadband stations beneath the North China Craton (NCC), we obtained a high-resolution velocity ratio image of the upper mantle. The abnormal velocity ratio indicates a strong lateral variation of the mineral composition in the upper mantle beneath North China. Two low-velocity ratio patches are imaged at the top of the upper mantle and the 410 km depth, respectively. The former may be related to the orthopyroxene enrichment in the lithospheric mantle, and the latter may reflect the stagnant Pacific slab in the mantle transition zone (MTZ). A prominent high-velocity-ratio anomaly is also imaged in the upper mantle beneath the Shaanxi-Shanxi rift system in the central NCC, with the highest anomaly reaching 10%. We speculate that the high velocity ratio of upper mantle is related to convective flow due to slab dehydration in the MTZ. The dehydration of the retained slab in the MTZ results in partial melting and upwelling of upper mantle materials. Such convective flow and their melting are closely related to the Cenozoic basalt eruption in the northern section of the Shaanxi-Shanxi rift system. (C) 2017 Elsevier Ltd. All rights reserved.
WOS关键词INDO-ASIAN COLLISION ; SINO-KOREAN CRATON ; LITHOSPHERIC THICKNESS ; SEISMIC ANISOTROPY ; TRANSITION ZONE ; WAVE ; DESTRUCTION ; EVOLUTION ; BASALTS ; WESTERN
WOS研究方向Geology
语种英语
WOS记录号WOS:000401376300025
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Natural Science Foundations of China(41504045 ; National Natural Science Foundations of China(41504045 ; China Postdoctoral Science Foundation(2015M582050) ; China Postdoctoral Science Foundation(2015M582050) ; 41574048) ; 41574048) ; National Natural Science Foundations of China(41504045 ; National Natural Science Foundations of China(41504045 ; China Postdoctoral Science Foundation(2015M582050) ; China Postdoctoral Science Foundation(2015M582050) ; 41574048) ; 41574048) ; National Natural Science Foundations of China(41504045 ; National Natural Science Foundations of China(41504045 ; China Postdoctoral Science Foundation(2015M582050) ; China Postdoctoral Science Foundation(2015M582050) ; 41574048) ; 41574048) ; National Natural Science Foundations of China(41504045 ; National Natural Science Foundations of China(41504045 ; China Postdoctoral Science Foundation(2015M582050) ; China Postdoctoral Science Foundation(2015M582050) ; 41574048) ; 41574048)
源URL[http://ir.iggcas.ac.cn/handle/132A11/52919]  
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Tian, Xiaobo
作者单位1.Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangzhou 510275, Guangdong, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
推荐引用方式
GB/T 7714		 Si, Shaokun,Tian, Xiaobo,Gao, Rui. Constraints on upper mantle V-p/V-s ratio variations beneath eastern North China from receiver function tomography[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017,138:341-356.
APA Si, Shaokun,Tian, Xiaobo,&Gao, Rui.(2017).Constraints on upper mantle V-p/V-s ratio variations beneath eastern North China from receiver function tomography.JOURNAL OF ASIAN EARTH SCIENCES,138,341-356.
MLA Si, Shaokun,et al."Constraints on upper mantle V-p/V-s ratio variations beneath eastern North China from receiver function tomography".JOURNAL OF ASIAN EARTH SCIENCES 138(2017):341-356.

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来源：地质与地球物理研究所

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