气候变化领域集成服务门户(CCPortal): Displacement along the Karakoram fault, NW Himalaya, estimated from LA-ICP-MS U-Pb dating of offset geologic markers

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DOI	10.1016/j.epsl.2012.05.037
	Displacement along the Karakoram fault, NW Himalaya, estimated from LA-ICP-MS U-Pb dating of offset geologic markers
	Wang, Shifeng; Wang, Chao; Phillips, Richard J.; Murphy, Michael A.; Fang, Xiaomin; Yue, Yahui
通讯作者	Wang, SF (通讯作者)
发表日期	2012
ISSN	0012-821X
EISSN	1385-013X
起始页码	156
结束页码	163
卷号	337
英文摘要	The magnitude of fault offset, a key parameter of fault geometry and kinematics, provides critical information on the role of the Karakoram fault (KKF) in accommodating deformation of the Tibetan crust. Geologic markers used for estimating the magnitude of offset along the KKF include: (1) geomorphologic features, (2) correlative stratigraphic sequences, (3) ophiolite melange belts, (4) igneous bodies, and (5) regional fault systems. The debated offsets of the KKF range from 40 km to as much as 1000 km. Conflicting offsets may result from a lack of available offset correlations based on quantitative measurements. The Kunsha granite and the Ayilari granite provide another set of potential markers for estimating the offset along the KKF. U-Pb zircon ages and textural observations provide the basis for correlating these granites. Zircon U-Pb ages show that both the Kunsha granite and the South Ayilari granite crystallized around 50 Ma ago, whereas the North Ayilari granite formed mostly around 20 Ma ago. Reconstruction of batholiths on two sides of the Namru-Menshi basin, as well as the Yalung-Zangbo suture and the trace of the South Kailas thrust, show the offset along the KKF to be about 52 +/- 2 km. The chronologic data appear to preclude a 100 km offset, based on the correlation between the North Ayilari granite and the Kunsha granite. Our data further disproves the conjecture that the North Ayilari granite is synkinematic granite of the KKF, and thus contradicts a 280400 km ophiolite melange belt offset, since it is based on the an incorrect fault initiation time. We calculate a slip rate of 4.5 +/- 0.1 mm/yr since 12 Ma, which implies that the average long-term slip rate is low. This does not support the lateral extrusion model, which predicts a high slip rate. It does support the concept that the collision between India and Eurasia proceeded by distributed deformation rather than lateral extrusion along faults that bound a rigid Tibet. (C) 2012 Elsevier B.V. All rights reserved.
关键词	STRUCTURAL EVOLUTION METAMORPHIC COMPLEX TECTONIC EVOLUTION SOUTHWEST TIBET SOUTHERN TIBET WESTERN TIBET SLIP-RATE DEFORMATION ZONE LADAKH
英文关键词	U-Pb dating; fault offset; Karakoram fault; Ayilari granite; Kunsha granite; Yarlung-Zangbo suture
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000307431800017
来源期刊	EARTH AND PLANETARY SCIENCE LETTERS
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/258066
推荐引用方式 GB/T 7714	Wang, Shifeng,Wang, Chao,Phillips, Richard J.,et al. Displacement along the Karakoram fault, NW Himalaya, estimated from LA-ICP-MS U-Pb dating of offset geologic markers[J]. 中国科学院青藏高原研究所,2012,337.
APA	Wang, Shifeng,Wang, Chao,Phillips, Richard J.,Murphy, Michael A.,Fang, Xiaomin,&Yue, Yahui.(2012).Displacement along the Karakoram fault, NW Himalaya, estimated from LA-ICP-MS U-Pb dating of offset geologic markers.EARTH AND PLANETARY SCIENCE LETTERS,337.
MLA	Wang, Shifeng,et al."Displacement along the Karakoram fault, NW Himalaya, estimated from LA-ICP-MS U-Pb dating of offset geologic markers".EARTH AND PLANETARY SCIENCE LETTERS 337(2012).