Three-dimensional crustal velocity structure of P-wave in East China from wide-angle reflection and refraction surveys

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	Three-dimensional crustal velocity structure of P-wave in East China from wide-angle reflection and refraction surveys
	Zhao, ZX (Zhao ZhiXin); Xu, JR (Xu JiRen)
刊名	CHINESE SCIENCE BULLETIN
	2009
卷号	54 期号:8 页码:1389-1397
关键词	Crustal velocity structure Dabie-Sulu orogen Moho discontinuity left lateral strike-slip motion wide-angle reflection and refraction survey
ISSN号	1001-6538
英文摘要	The 3-D crustal structure of P-wave velocity in East China is studied based on the data obtained by wide-angle seismic reflection and refraction surveys. The results suggest that a deep Moho discontinuity exists in the western zone of the study region, being 35-48 thick. High-velocity structure zones exist in the upper crust shallower than 20 km beneath the Sulu and Dabie regions. The cause of high-velocity zones is attributable to high-pressure metamorphic (HPM) and ultra-high-pressure metamorphic (UHPM) terranes with high velocity and density exhuming up to the upper crust in the Sulu and Dabie orogenies. Anomalous zones of low velocity are in the lower crust, about 30 km beneath the Sulu and Dabie regions. The Moho discontinuity is as deep as 38 km beneath the Dabie region, deeper than those in the surrounding areas. The Moho discontinuity beneath the Sulu orogenic region is also a little deeper than those in its vicinity, being about 32 km. The deep Moho discontinuity zone implies that the low crustal velocity structure zone is in that region. The low-velocity characteristics in the lower crust are probably related to the remnant crustal root of the old mountains due to the orogeny in the Sulu and Dabie regions. The high-velocity anomalous zones in the upper crust and low-velocity anomalous zones in the lower crust beneath the Sulu region are all located northeast of the northern segment of the Tan-Lu fault. However, the high- and low-velocity anomalous zones beneath the Dabie region are located southwest of the southern segment of the Tan-Lu fault. Such a distribution of the velocity-anomalous zones looks to be attributable a left lateral slip motion along the Tan-Lu fault. The distribution pattern of the velocity-anomalous zones may show some evidence for the left strike-slip motion regime of the Tan-Lu fault.
学科主题	地球物理勘探
WOS关键词	OROGENIC BELT ; STRESS-FIELD ; TOMOGRAPHY ; EXHUMATION ; INVERSION ; BENEATH
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000265019200017
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38952]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Zhao, ZX ,Xu, JR . Three-dimensional crustal velocity structure of P-wave in East China from wide-angle reflection and refraction surveys[J]. CHINESE SCIENCE BULLETIN,2009,54(8):1389-1397.
APA	Zhao, ZX ,&Xu, JR .(2009).Three-dimensional crustal velocity structure of P-wave in East China from wide-angle reflection and refraction surveys.CHINESE SCIENCE BULLETIN,54(8),1389-1397.
MLA	Zhao, ZX ,et al."Three-dimensional crustal velocity structure of P-wave in East China from wide-angle reflection and refraction surveys".CHINESE SCIENCE BULLETIN 54.8(2009):1389-1397.