U-Pb SHRIMP and Ar-40/Ar-39 ages constrain the deformation history of the Karakoram fault zone (KFZ), SW Tibet

doi:10.1016/j.tecto.2011.06.011

	U-Pb SHRIMP and Ar-40/Ar-39 ages constrain the deformation history of the Karakoram fault zone (KFZ), SW Tibet
	Wang, Shifeng 1; Wang, Erchie 2; Fang, Xiaomin 1; Lai, Qingzhou 1
刊名	TECTONOPHYSICS
	2011-08-15
卷号	509 期号:3-4 页码:208-217
关键词	Karakoram fault zone Gangdese magmatism belt Tibet U-Pb Ar-40/Ar-39
ISSN号	0040-1951
DOI	10.1016/j.tecto.2011.06.011
文献子类	Article
英文摘要	The similar to 800-km-long dextral Karakoram fault zone (KFZ) bounds SW Tibet and, despite a number of recent studies, its spatial and temporal evolution and consequent role in continental deformation remains under debate. In order to better constrain fault evolution we present U-Pb Sensitive High Resolution Ion MicroProbe (SHRIMP) and Ar-40/Ar-39 analyses of granitic samples from the southern portion of the Karakoram Fault. Zircons from the ductile shear zone in the Namru region of the Ayilari granite batholith record a crystallization age compatible with Gangdese magmatism belt (also known as the Trans-Himalayan magmatic Belt. THB) followed by a medium temperature cooling event between about 12.8-11.5 Ma. And zircons from the ductile shear zone in the Zhaxigang region of the Ayilari granite batholith record a crystallization age of 18.7 Ma. The Ayilari granite batholith near Namru appears to have experienced neither the 32 Ma nor 25-22 Ma magmatic events reported by previous studies. Biotite Ar-40/Ar-39 ages provide evidence that the 12.8-11.5 Ma cooling event coincides with the initiation of the KFZ cutting through the Ayilari granite, both at Namru and Zhaxigang. Consequently, we conclude that the previously reported 32 Ma, 25-22 Ma and 22-14 Ma events bear no relationship to the activity along the Karakoram fault, but resulted from either local metamorphic events caused by regional tectonics (such as activity on the south Kailas thrust fault), or from magmatism around Shiquanhe (also known as Gar). This study supports the conclusion that the KFZ, at least in the Zhaxigang-Namru region, propagated along strike to the Gar-Menshi area as a thin-skinned structure at around 13 Ma. (C) 2011 Published by Elsevier B.V.
WOS关键词	INDIA-ASIA COLLISION ; SOUTHERN TIBET ; TECTONIC EVOLUTION ; SOUTHWEST TIBET ; STRUCTURAL EVOLUTION ; WESTERN TIBET ; SUTURE ZONE ; SLIP RATES ; SYSTEM ; LADAKH
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000295148600006
资助机构	China National Key Project(2011CB403106) ; China National Key Project(2011CB403106) ; NSFC(41021001 ; NSFC(41021001 ; 40672142) ; 40672142) ; China National Key Project(2011CB403106) ; China National Key Project(2011CB403106) ; NSFC(41021001 ; NSFC(41021001 ; 40672142) ; 40672142) ; China National Key Project(2011CB403106) ; China National Key Project(2011CB403106) ; NSFC(41021001 ; NSFC(41021001 ; 40672142) ; 40672142) ; China National Key Project(2011CB403106) ; China National Key Project(2011CB403106) ; NSFC(41021001 ; NSFC(41021001 ; 40672142) ; 40672142)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/74744]
专题	中国科学院地质与地球物理研究所
通讯作者	Wang, Shifeng
作者单位	1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100085, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Wang, Shifeng,Wang, Erchie,Fang, Xiaomin,et al. U-Pb SHRIMP and Ar-40/Ar-39 ages constrain the deformation history of the Karakoram fault zone (KFZ), SW Tibet[J]. TECTONOPHYSICS,2011,509(3-4):208-217.
APA	Wang, Shifeng,Wang, Erchie,Fang, Xiaomin,&Lai, Qingzhou.(2011).U-Pb SHRIMP and Ar-40/Ar-39 ages constrain the deformation history of the Karakoram fault zone (KFZ), SW Tibet.TECTONOPHYSICS,509(3-4),208-217.
MLA	Wang, Shifeng,et al."U-Pb SHRIMP and Ar-40/Ar-39 ages constrain the deformation history of the Karakoram fault zone (KFZ), SW Tibet".TECTONOPHYSICS 509.3-4(2011):208-217.