High-resolution body wave tomography models of the upper mantle beneath eastern China and the adjacent areas

doi:10.1029/2012GC004119

	High-resolution body wave tomography models of the upper mantle beneath eastern China and the adjacent areas
	Zhao, Liang 1; Allen, Richard M.2; Zheng, Tianyu 1; Zhu, Rixiang 1
刊名	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
	2012-06-09
卷号	13
关键词	body-wave tomography eastern China upper mantle structures
ISSN号	1525-2027
DOI	10.1029/2012GC004119
文献子类	Article
英文摘要	We present new 3-D tomographic models of V-P, V-S and V-P/V-S ratio anomalies in the upper mantle beneath EC and adjacent areas. This data was collected and interpreted with the goal of clarifying geodynamic processes that caused spatially variable event histories throughout Eastern China (EC) during Mesozoic to Cenozoic time. The tomographic images were constructed by inverting body wave travel-times recorded at similar to 1300 stations within the upgraded China National Seismic Network, and 9 temporary arrays. Resolution tests for different depths and the featured velocity anomalies verify that the tomographic images capture the velocity heterogeneities in the upper mantle to depths of 700 km. The salient features of V-P, V-S and V-P/V-S ratio anomalies can be clearly identified. These include strong multiscale heterogeneities occupying the upper mantle beneath EC and differences in the spatial scale of anomalies found beneath northern and southern areas of EC. These features demonstrate a degree of spatial variability in the geodynamic evolution of EC. We propose two mechanisms to explain these patterns. First, the western front of the subducted slab may have imparted greater horizontal compressional stress in areas where it impinged further eastward into EC. These areas would experience stronger convection and an altered stress regime in the upper mantle, creating significant thermal anomalies beneath the South China Block (SCB) relative to the eastern North China Craton (NCC). Second, differing thermal states and viscosities for the eastern NCC and the Cathaysia Block (CaB) resulted in differing responses to regional deformation. The Archean hinterland of the eastern NCC specifically has a colder thermal state and higher viscosity, and therefore exhibits only small-scale heterogeneities due to the effect of shear localization. The Neoproterozoic CaB has a relatively warm thermal state with lower viscosity, and thus deformed more continuously.
WOS关键词	VELOCITY STRUCTURE BENEATH ; FREQUENCY TRAVEL-TIMES ; SINO-KOREAN CRATON ; SOUTH CHINA ; SEISMIC TOMOGRAPHY ; LITHOSPHERIC THICKNESS ; SURROUNDING REGIONS ; NORTHEASTERN CHINA ; TECTONIC EVOLUTION ; SOUTHEASTERN CHINA
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000305144600002
资助机构	Chinese Academy of Sciences(KZCX2-YW-QN102) ; Chinese Academy of Sciences(KZCX2-YW-QN102) ; Chinese Academy of Sciences(KZCX2-YW-QN102) ; Chinese Academy of Sciences(KZCX2-YW-QN102) ; NSFC(90914011 ; NSFC(90914011 ; NSFC(90914011 ; NSFC(90914011 ; 40974030) ; 40974030) ; 40974030) ; 40974030) ; Chinese Academy of Sciences(KZCX2-YW-QN102) ; Chinese Academy of Sciences(KZCX2-YW-QN102) ; Chinese Academy of Sciences(KZCX2-YW-QN102) ; Chinese Academy of Sciences(KZCX2-YW-QN102) ; NSFC(90914011 ; NSFC(90914011 ; NSFC(90914011 ; NSFC(90914011 ; 40974030) ; 40974030) ; 40974030) ; 40974030) ; Chinese Academy of Sciences(KZCX2-YW-QN102) ; Chinese Academy of Sciences(KZCX2-YW-QN102) ; Chinese Academy of Sciences(KZCX2-YW-QN102) ; Chinese Academy of Sciences(KZCX2-YW-QN102) ; NSFC(90914011 ; NSFC(90914011 ; NSFC(90914011 ; NSFC(90914011 ; 40974030) ; 40974030) ; 40974030) ; 40974030) ; Chinese Academy of Sciences(KZCX2-YW-QN102) ; Chinese Academy of Sciences(KZCX2-YW-QN102) ; Chinese Academy of Sciences(KZCX2-YW-QN102) ; Chinese Academy of Sciences(KZCX2-YW-QN102) ; NSFC(90914011 ; NSFC(90914011 ; NSFC(90914011 ; NSFC(90914011 ; 40974030) ; 40974030) ; 40974030) ; 40974030)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/84602]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhao, Liang
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Calif Berkeley, Seismol Lab, Berkeley, CA 94720 USA
推荐引用方式 GB/T 7714	Zhao, Liang,Allen, Richard M.,Zheng, Tianyu,et al. High-resolution body wave tomography models of the upper mantle beneath eastern China and the adjacent areas[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2012,13.
APA	Zhao, Liang,Allen, Richard M.,Zheng, Tianyu,&Zhu, Rixiang.(2012).High-resolution body wave tomography models of the upper mantle beneath eastern China and the adjacent areas.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,13.
MLA	Zhao, Liang,et al."High-resolution body wave tomography models of the upper mantle beneath eastern China and the adjacent areas".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 13(2012).