Clay mineral anomalies in the Yingxiu-Beichuan fault zone from the WFSD-1 drilling core and its implication for the faulting mechanism during the 2008 Wenchuan earthquake (Mw 7.9)

doi:10.1016/j.tecto.2013.09.022

	Clay mineral anomalies in the Yingxiu-Beichuan fault zone from the WFSD-1 drilling core and its implication for the faulting mechanism during the 2008 Wenchuan earthquake (Mw 7.9)
	Si, Jialiang 1; Li, Haibing 1; Kuo, Liwei 2; Pei, Junling 3; Song, Shengrong 2; Wang, Huan 1
刊名	TECTONOPHYSICS
	2014
卷号	619 页码:171-178
关键词	Yingxiu Beichuan fault zone Wenchuan earthquake Clay minerals Principal slip zone (PSZ) WFSD-1
ISSN号	0040-1951
DOI	10.1016/j.tecto.2013.09.022
英文摘要	The first hole of the Wenchuan earthquake Fault Scientific Drilling (WFSD-1) was started on Nov. 6, 2008 as a rapid response to the May 12, 2008 Wenchuan earthquake (Mw 7.9), which slipped along the Longmen Shan fault on the eastern margin of the Tibetan Plateau. WFSD-1 was drilled to a depth of 1201.15 m and intersected the presumed active fault zone at a depth of 590 m (FZ590), which contains the maximum value of fracture density and fresh fault gouge. Here we characterized fault rocks of FZ590 by conducting XRD analyses with cohesive and non-cohesive rock samples collected from WFSD-1 borehole cores. The results indicate that a clay anomaly zone is located in the FZ590 fault zone. The slight enrichment of smectite distributed in fresh fault gouge implies that there is a fault-related authigenic clay formation. In addition, the location of the slight enrichment of smectite is consistent with the plausible active slip zone determined by previous results, adding confidence to the supposition that the principal slip zone (PSZ) of the 2008 Wenchuan earthquake is located at a depth of 589.2 m and situated at the lithological boundary of the Neoproterozoic Pengguan Complex and Triassic Xujiahe Formation. The tiny clay anomaly signal captured from borehole cores implies that low frictional heat was generated by coseismic slip, which drives only slight authigenesis processes. Thus, other dynamic weakening mechanisms, such as thermal pressurization may be involved in the fault zone of the Yingxiu Beichuan fault during 2008 Wenchuan earthquake. (C) 2013 Elsevier B.V. All rights reserved.
学科主题	构造地质学
WOS关键词	LOW FRICTIONAL STRENGTH ; SAN-ANDREAS FAULT ; SLIP ZONE ; CHELUNGPU-FAULT ; ROCKS ; LUBRICATION ; TEMPERATURE ; RATES ; PRESSURE ; RUPTURE
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000335284900018
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40525]
专题	中国地质科学院地质研究所
作者单位	1.State Key Lab Continental Tecton & Dynam, Beijing, Peoples R China 2.Chinese Acad Geol Sci, Inst Geol, Beijing, Peoples R China 3.Natl Taiwan Univ, Dept Geosci, Taipei 10764, Taiwan 4.Chinese Acad Geol Sci, Inst Geomech, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Si, Jialiang,Li, Haibing,Kuo, Liwei,et al. Clay mineral anomalies in the Yingxiu-Beichuan fault zone from the WFSD-1 drilling core and its implication for the faulting mechanism during the 2008 Wenchuan earthquake (Mw 7.9)[J]. TECTONOPHYSICS,2014,619:171-178.
APA	Si, Jialiang,Li, Haibing,Kuo, Liwei,Pei, Junling,Song, Shengrong,&Wang, Huan.(2014).Clay mineral anomalies in the Yingxiu-Beichuan fault zone from the WFSD-1 drilling core and its implication for the faulting mechanism during the 2008 Wenchuan earthquake (Mw 7.9).TECTONOPHYSICS,619,171-178.
MLA	Si, Jialiang,et al."Clay mineral anomalies in the Yingxiu-Beichuan fault zone from the WFSD-1 drilling core and its implication for the faulting mechanism during the 2008 Wenchuan earthquake (Mw 7.9)".TECTONOPHYSICS 619(2014):171-178.