Complicated 3D mantle flow beneath Northeast China from shear wave   splitting and its implication for the Cenozoic intraplate volcanism

doi:10.1016/j.tecto.2017.04.015

CORC > 北京大学 > 地球与空间科学学院

	Complicated 3D mantle flow beneath Northeast China from shear wave splitting and its implication for the Cenozoic intraplate volcanism
	Li, Shilin ; Guo, Zhen ; Chen, Y. John
刊名	TECTONOPHYSICS
	2017
关键词	Seismic anisotropy Big mantle wedge convection Small-scale convection lntraplate volcanism Songliao basin Changbaishan volcano 660 KM DISCONTINUITY SEISMIC ANISOTROPY NE CHINA TRANSITION ZONE EASTERN CHINA SUBDUCTION DEFORMATION CONSTRAINTS EVOLUTION ASIA
DOI	10.1016/j.tecto.2017.04.015
英文摘要	We obtained shear wave splitting measurements from XKS (SKS and SKKS) phases recorded by the NECESSArray project consisting of 127 seismic stations in Northeast China (NEC). The most salient feature of the anisotropy in NE China is the alignment of subduction-parallel fast direction, which can be explained by the background upper mantle flow in the big mantle wedge (BMW). However, the geographical variations of fast direction and delay time, which closely follow the geometry of subducting Pacific slab, suggests that the slab morphology controls the geometry of 3-D mantle flow in the BMW. The most significant finding of this study is the complex anisotropic pattern with most nulls observed in the Changbaishan mountain region (CBM) and southern Songliao basin. At the southern Songliao basin, the small delay times as well as null measurements of shear wave splitting are coincident with the high velocity in the upper mantle down to similar to 300 km from previous studies. The observed anisotropy likely arises from the combination of BMW convection and more localized upper mantle convection, that is, a plume-like mantle upwelling from the mantle transition zone beneath the Changbaishan region triggers the down-welling beneath the southern Songliao basin. (C) 2017 Elsevier B.V. All rights reserved.; NSFC grant [91128210]; Southern University of Science and Technology, China; SCI(E); ARTICLE; 1-8; 709
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/472212]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Li, Shilin,Guo, Zhen,Chen, Y. John. Complicated 3D mantle flow beneath Northeast China from shear wave splitting and its implication for the Cenozoic intraplate volcanism[J]. TECTONOPHYSICS,2017.
APA	Li, Shilin,Guo, Zhen,&Chen, Y. John.(2017).Complicated 3D mantle flow beneath Northeast China from shear wave splitting and its implication for the Cenozoic intraplate volcanism.TECTONOPHYSICS.
MLA	Li, Shilin,et al."Complicated 3D mantle flow beneath Northeast China from shear wave splitting and its implication for the Cenozoic intraplate volcanism".TECTONOPHYSICS (2017).