气候变化领域集成服务门户(CCPortal): Tomographic structure of East Asia: II. Stagnant slab above 660 km discontinuity and its geodynamic implications

CCPortal

DOI	10.1007/s11589-010-0760-4
	Tomographic structure of East Asia: II. Stagnant slab above 660 km discontinuity and its geodynamic implications
	Chen, Yongshun; Pei, Shunping
通讯作者	Chen, YJ (通讯作者)
发表日期	2010
ISSN	1674-4519
EISSN	1867-8777
起始页码	613
结束页码	626
卷号	23 期号:6
英文摘要	P-wave arrival times of both regional and teleseismic earthquakes were inverted to obtain mantle structures of East Asia. No fast (slab) velocity anomalies was not find beneath the 660-km discontinuity through tomography besides a stagnant slab within the transition zone. Slow P-wave velocity anomalies are present at depths of 100-250 km below the active volcanic arc and East Asia. The western end of the flat stagnant slab is about 1 500 km west to active trench and may also be correlated with prominent surface topographic break in eastern China. We suggested that active mantle convection might be operating within this horizontally expanded mantle wedge above both the active subducting slabs and the stagnant flat slabs beneath much of the North China plain. Both the widespread Cenozoic volcanism and associated extensional basins in East Asia could be the manifestation of this vigorous upper mantle convection. Cold or thermal anomalies associated with the stagnant slabs above the 660-km discontinuity have not only caused a broad depression of the boundary due to its negative Clapeyron slope but also effectively shielded the asthenosphere and continental lithosphere above from any possible influence of mantle plumes in the lower mantle.
关键词	SINO-KOREAN CRATON TECTONIC EVOLUTION STRUCTURE BENEATH LOWER MANTLE SEISMIC EVIDENCE NORTHEAST CHINA TRANSITION ZONE DEEP-STRUCTURE SOUTH CHINA P-WAVE
英文关键词	tomography; stagnant slab; mantle wedge
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000210043900010
来源期刊	EARTHQUAKE SCIENCE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257750
推荐引用方式 GB/T 7714	Chen, Yongshun,Pei, Shunping. Tomographic structure of East Asia: II. Stagnant slab above 660 km discontinuity and its geodynamic implications[J]. 中国科学院青藏高原研究所,2010,23(6).
APA	Chen, Yongshun,&Pei, Shunping.(2010).Tomographic structure of East Asia: II. Stagnant slab above 660 km discontinuity and its geodynamic implications.EARTHQUAKE SCIENCE,23(6).
MLA	Chen, Yongshun,et al."Tomographic structure of East Asia: II. Stagnant slab above 660 km discontinuity and its geodynamic implications".EARTHQUAKE SCIENCE 23.6(2010).