The relationship between the internal structure of the Wenchuan;earthquake fault zone and the uplift of the Longmenshan.

	The relationship between the internal structure of the Wenchuan;earthquake fault zone and the uplift of the Longmenshan.
	Wang Huan 3; Li HaiBing ; Si JiaLiang ; Huang Yao 1
刊名	ACTA PETROLOGICA SINICA
	2013
卷号	29 期号:6 页码:2048-2060
关键词	Wenchuan earthquake Yingxiu-Beichuan fault zone Internal structure Uplift Longmenshan
ISSN号	1000-0569
英文摘要	The 2008 Wenchuan earthquake (M-w 7. 9) occurred at the eastern margin of the Tibetan Plateau, producing 270km and 80km-long co-seismic surface ruptures with different kinematics features, along the Yingxiu-Beichuan and Guanxian-Anxian faults, respectively. Fault rocks are the products of fault activities. The characteristics of fault rocks provide information on fault activities and their evolution history. Here, we focus on the outcrop of the Yingxiu-Beichuan fault in Bajiaomiao village, Hongkou town and results from WFSD-1 drill cores. Based on field survey, X-ray diffraction analysis, microstructure and drill cores analysis, a similar to 240m-wide fault zone was confirmed as the Yingxiu-Beichuan fault zone from the outcrop, corresponding to the similar to 105m-wide fault zone at depth, as determined from the WFSD-1 drill cores, which presents the characteristics of a multiple cores model. Fault rocks, including fault breccia, fault gouge and cataclasite were identified in both the outcrop and drill cores, while pseudotachylyte was only visible at the outcrop. The location of the Principal Slip Zone of the Wenchuan earthquake, which does not entirely follow the ancient fault zone, obliquely crossing the Yingxiu-Beichuan fault zone, might indicate that the Wenchuan earthquake fault and Yingxiu-Beichuan fault do not belong to the same fault system. Based on fault rocks studies, there are four kinds of fault mechanisms along the Yingxiu-Beichuan fault zone, such as frictional melting, thermal pressurization, mechanical lubrication and elasto-hydrodynamic lubrication. Thermochronometry research indicates that the Yingxiu-Beichuan fault activity has controlled the rapid uplift of the Longmenshan since it formed at 15 similar to 10Ma ago. The fact that the internal structure shows five different fault rock units in the fault zone may be related to the different episodes of the Longmenshan uplift.
学科主题	构造地质学
WOS关键词	STRIKE-SLIP FAULTS ; TECTONIC IMPLICATIONS ; MECHANICAL-PROPERTIES ; SURFACE RUPTURE ; PUNCHBOWL FAULT ; EASTERN MARGIN ; SHEAR ZONE ; CHINA ; GOUGE ; TIBET
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000322427000014
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40116]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China. 2.6 Brigade Jiangsu Geol & Mineral Resources Bur, Lianyungang 222300, Peoples R China. 3.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Wang Huan,Li HaiBing,Si JiaLiang,et al. The relationship between the internal structure of the Wenchuan;earthquake fault zone and the uplift of the Longmenshan.[J]. ACTA PETROLOGICA SINICA,2013,29(6):2048-2060.
APA	Wang Huan,Li HaiBing,Si JiaLiang,&Huang Yao.(2013).The relationship between the internal structure of the Wenchuan;earthquake fault zone and the uplift of the Longmenshan..ACTA PETROLOGICA SINICA,29(6),2048-2060.
MLA	Wang Huan,et al."The relationship between the internal structure of the Wenchuan;earthquake fault zone and the uplift of the Longmenshan.".ACTA PETROLOGICA SINICA 29.6(2013):2048-2060.