气候变化领域集成服务门户(CCPortal): Evidence for constriction and Pliocene acceleration of east-west extension in the North Lunggar rift region of west central Tibet

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DOI	10.1002/tect.20086
	Evidence for constriction and Pliocene acceleration of east-west extension in the North Lunggar rift region of west central Tibet
	Sundell, Kurt E.; Taylor, Michael H.; Styron, Richard H.; Stockli, Daniel F.; Kapp, Paul; Hager, Christian; Liu, Deliang; Ding, Lin
通讯作者	Sundell, KE (通讯作者)
发表日期	2013
ISSN	0278-7407
EISSN	1944-9194
起始页码	1454
结束页码	1479
卷号	32 期号:5
英文摘要	The active north trending North Lunggar rift in west central southern Tibet exposes an extensional metamorphic core complex bounded by an east dipping low-angle normal fault. Apatite and zircon (U-Th)/He thermochronology and thermal modeling of the North Lunggar rift document a minimum timing for rift inception at >10Ma and rapid footwall exhumation between 5 and 2Ma. Miocene footwall cooling and exhumation rates were initially slow to moderate at <50 degrees CMa(-1) and <1mma(-1), followed by increased Pliocene rates as high as >400 degrees CMa(-1) and 4-10mma(-1). Footwall isotherms were significantly compressed during rapid exhumation resulting in an elevated transient geothermal gradient between 50 and 90 degrees Ckm(-1). The minimum magnitude of horizontal extension for the North Lunggar rift is 8.1-12.8km; maximum is 15-20km, less in the south at similar to 10km. Mean Pliocene extension rate is 1.2-2.4mma(-1) in the similar to 120 degrees direction. Results for the North Lunggar rift are similar in magnitude, rate, and orientation of slip to the kinematically linked Lamu Co dextral strike-slip fault to the north. This suggests a state of constrictional strain during Pliocene time along this stretch of the Bangong-Nujiang suture from which the Lamu Co fault emanates. The onset of extension in this region may be explained by crustal thickening and gravitational orogenic collapse, followed by accelerated rifting resulting from localized crustal stretching and increased magmatic activity, potentially driven by the position and northward extent of underthrusting Indian lithosphere.
关键词	LOW-TEMPERATURE THERMOCHRONOMETRY METAMORPHIC CORE COMPLEXES APATITE (U-TH)/HE THERMOCHRONOMETRY INDIA-ASIA COLLISION NUJIANG SUTURE ZONE SOUTHERN TIBET TECTONIC EVOLUTION LOWER CRUST QUATERNARY EXTENSION DIFFUSION KINETICS
英文关键词	Tibet; North Lunggar; rift acceleration; low-angle normal faulting; (U-Th); He thermochronology; transient geothermal gradient
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000327305800023
来源期刊	TECTONICS
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/258213
推荐引用方式 GB/T 7714	Sundell, Kurt E.,Taylor, Michael H.,Styron, Richard H.,et al. Evidence for constriction and Pliocene acceleration of east-west extension in the North Lunggar rift region of west central Tibet[J]. 中国科学院青藏高原研究所,2013,32(5).
APA	Sundell, Kurt E..,Taylor, Michael H..,Styron, Richard H..,Stockli, Daniel F..,Kapp, Paul.,...&Ding, Lin.(2013).Evidence for constriction and Pliocene acceleration of east-west extension in the North Lunggar rift region of west central Tibet.TECTONICS,32(5).
MLA	Sundell, Kurt E.,et al."Evidence for constriction and Pliocene acceleration of east-west extension in the North Lunggar rift region of west central Tibet".TECTONICS 32.5(2013).