气候变化领域集成服务门户(CCPortal): U-Pb SHRIMP and Ar-40/Ar-39 ages constrain the deformation history of the Karakoram fault zone (KFZ), SW Tibet

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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; Wang, Erchie; Fang, Xiaomin; Lai, Qingzhou
通讯作者	Wang, SF (通讯作者)
发表日期	2011
ISSN	0040-1951
EISSN	1879-3266
起始页码	208
结束页码	217
卷号	509 期号:3-4
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.
关键词	STRUCTURAL EVOLUTION TECTONIC EVOLUTION SOUTHWEST TIBET WESTERN TIBET SOUTHERN TIBET SUTURE ZONE SLIP RATES SYSTEM LADAKH INDIA
英文关键词	Karakoram fault zone; Gangdese magmatism belt; Tibet; U-Pb; Ar-40/Ar-39
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000295148600006
来源期刊	TECTONOPHYSICS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257850
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]. 中国科学院青藏高原研究所,2011,509(3-4).
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).
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).