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Mantle Transition Zone Structure Beneath Northeast Asia From 2-D Triplicated Waveform Modeling: Implication for a Segmented Stagnant Slab
Lai, Yujing1,2; Chen, Ling1,2,3; Wang, Tao4; Zhan, Zhongwen5
2019-02-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN2169-9313
Volume124Issue:2Pages:1871-1888
AbstractThe structure of the mantle transition zone (MTZ) in subduction zones is essential for understanding subduction dynamics in the deep mantle and its surface responses. We constructed the P (V-p) and SH velocity (V-s) structure images of the MTZ beneath Northeast Asia based on two-dimensional (2-D) triplicated waveform modeling. In the upper MTZ, a normal V-p but 2.5% low V-s layer compared with IASP91 are required by the triplication data. In the lower MTZ, our results show a relatively higher-velocity layer (+2% V-p and -0.5% V-s compared to IASP91) with a thickness of similar to 140km and length of similar to 1,200km atop the 660-km discontinuity. Taking this anomaly as the stagnant slab and considering the plate convergence rate of 7-10cm/year in the western Pacific region during the late Cenozoic, we deduced that the stagnant slab has a subduction age of less than 30Ma. This suggests that the observed stagnancy of the slab in the MTZ beneath Northeast Asia may have occurred no earlier than the Early Oligocene. From the constraints derived individually on V-p and V-s structures, high V-p/V-s ratios are obtained for the entire MTZ beneath Northeast Asia, which may imply a water-rich and/or carbonated environment. Within the overall higher-velocity stagnant slab, a low-velocity anomaly was further detected, with a width of similar to 150km, V-p and V-s reductions of 1% and 3% relative to IASP91. Such a gap may have provided a passage for hot deep mantle materials to penetrate through the thick slab and feed the Changbaishan volcano.
KeywordMTZ structure Northeast Asia two-dimensional triplicated waveform modeling
DOI10.1029/2018JB016642
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; National Science Foundation ; National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; National Science Foundation ; National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; National Science Foundation ; National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; National Science Foundation ; National Science Foundation
WOS Keyword660 KM DISCONTINUITY ; SPECTRAL-ELEMENT SIMULATIONS ; HIGH-VELOCITY ANOMALIES ; SOUND VELOCITIES ; INTRAPLATE VOLCANISM ; EAST-ASIA ; CHINA IMPLICATIONS ; SEISMIC STRUCTURE ; SUBDUCTION ZONES ; PLATE SUBDUCTION
Language英语
Funding ProjectNational Natural Science Foundation of China[41688103] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA20070302] ; International Partnership Program of the Chinese Academy of Sciences[GJHZ1776] ; National Science Foundation[1722879]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; National Science Foundation ; National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; National Science Foundation ; National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; National Science Foundation ; National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; International Partnership Program of the Chinese Academy of Sciences ; National Science Foundation ; National Science Foundation
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000462355800041
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/91091
Collection岩石圈演化国家重点实验室
Corresponding AuthorChen, Ling; Wang, Tao
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth Sci, Beijing, Peoples R China
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
4.Nanjing Univ, Inst Geophys & Geodynam, Sch Earth Sci & Engn, Nanjing, Jiangsu, Peoples R China
5.CALTECH, Seismol Lab, Pasadena, CA 91125 USA
Recommended Citation
GB/T 7714
Lai, Yujing,Chen, Ling,Wang, Tao,et al. Mantle Transition Zone Structure Beneath Northeast Asia From 2-D Triplicated Waveform Modeling: Implication for a Segmented Stagnant Slab[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2019,124(2):1871-1888.
APA Lai, Yujing,Chen, Ling,Wang, Tao,&Zhan, Zhongwen.(2019).Mantle Transition Zone Structure Beneath Northeast Asia From 2-D Triplicated Waveform Modeling: Implication for a Segmented Stagnant Slab.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,124(2),1871-1888.
MLA Lai, Yujing,et al."Mantle Transition Zone Structure Beneath Northeast Asia From 2-D Triplicated Waveform Modeling: Implication for a Segmented Stagnant Slab".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 124.2(2019):1871-1888.
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