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
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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. |
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