A thinned lithospheric image of the Tanlu Fault Zone, eastern China: Constructed from wave equation based receiver function migration

doi:10.1029/2005JB003974

	A thinned lithospheric image of the Tanlu Fault Zone, eastern China: Constructed from wave equation based receiver function migration
	Chen, Ling; Zheng, Tianyu; Xu, Weiwei
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	2006-09-22
卷号	111 期号:B9
ISSN号	2169-9313
DOI	10.1029/2005JB003974
文献子类	Article
英文摘要	[ 1] We apply the newly proposed wave equation-based receiver function poststack migration method to the Northern China Interior Structure Project broadband data to image the lithospheric structure of the Tanlu Fault Zone area in eastern China. Our migration result reveals a 60- to 80-km-thick present-day lithosphere beneath the study region, significantly thinned from the Paleozoic lithosphere of > 180 km. The lithosphere-asthenosphere boundary (LAB) is coherently imaged along the similar to 300-km east-west profile, displaying an arc-like shape with its apex roughly coincident with the transverse location of the Tanlu Fault Zone on the surface. An obvious uplift from similar to 36 km to similar to 32 km of the Moho is also clearly detected right below this fault zone. The coincidence of the imaged Moho uplift and the LAB apex with the surface location of the Tanlu Fault Zone provides seismological evidence for the steep geometry and deep penetration of the fault system, and indicates that the Tanlu Fault Zone might have acted as a major channel for anthenosphere upwelling during the Mesozoic-Cenozoic continental extension and lithospheric thinning in eastern China. Frequency analysis and synthetic modeling suggest that both the Moho and the LAB are sharp and strong. The latter, in particular, is constrained to have a 3 - 7% drop in S wave velocity over a depth range of 10 km or less. Such a rapid velocity change at the base of the lithosphere in the study region cannot be solely explained by thermal variation, but likely reflects the presence of volatiles or melt in the asthenosphere, or is partially attributed to the compositional contrast between the preserved depleted and dehydrated cratonic lithospheric veneer and the uplifted hydrated and fertile asthenospheric materials.
WOS关键词	SINO-KOREAN CRATON ; LOWER CONTINENTAL-CRUST ; WESTERN UNITED-STATES ; EARTHS UPPER-MANTLE ; S CONVERTED PHASES ; HEAT-FLOW ; P-SV ; BENEATH ; TOMOGRAPHY ; EVOLUTION
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000240829100002
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/66880]
专题	中国科学院地质与地球物理研究所
通讯作者	Chen, Ling
作者单位	Chinese Acad Sci, Inst Geol & Geophys, Seismol Lab, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Chen, Ling,Zheng, Tianyu,Xu, Weiwei. A thinned lithospheric image of the Tanlu Fault Zone, eastern China: Constructed from wave equation based receiver function migration[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2006,111(B9).
APA	Chen, Ling,Zheng, Tianyu,&Xu, Weiwei.(2006).A thinned lithospheric image of the Tanlu Fault Zone, eastern China: Constructed from wave equation based receiver function migration.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,111(B9).
MLA	Chen, Ling,et al."A thinned lithospheric image of the Tanlu Fault Zone, eastern China: Constructed from wave equation based receiver function migration".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 111.B9(2006).