气候变化领域集成服务门户(CCPortal): Miocene initiation and acceleration of extension in the South Lunggar rift, western Tibet: Evolution of an active detachment system from structural mapping and (U-Th)/He thermochronology

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DOI	10.1002/tect.20053
	Miocene initiation and acceleration of extension in the South Lunggar rift, western Tibet: Evolution of an active detachment system from structural mapping and (U-Th)/He thermochronology
	Styron, Richard H.; Taylor, Michael H.; Sundell, Kurt E.; Stockli, Daniel F.; Oalmann, Jeffrey A. G.; Moeller, Andreas; McCallister, Andrew T.; Liu, Deliang; Ding, Lin
通讯作者	Styron, RH (通讯作者)
发表日期	2013
EISSN	1944-9194
起始页码	880
结束页码	907
卷号	32 期号:4
英文摘要	Ongoing extension in Tibet may have begun in the middle to late Miocene, but there are few robust estimates of the rates, timing, or magnitude of Neogene deformation within the Tibetan plateau. We present a comprehensive study of the seismically active South Lunggar rift in southwestern Tibet incorporating mapping, U-Pb geochronology and zircon (U-Th)/He thermochronology. The South Lunggar rift is the southern continuation of the North Lunggar rift and comprises a similar to 50kmN-S central horst bound by two major normal faults, the west-dipping South Lunggar detachment and the east-dipping Palung Co fault. The SLD dips at the rangefront similar to 20 degrees W and exhumes a well-developed mylonite zone in its footwall displaying fabrics indicative of normal-sense shear. The range is composed of felsic orthogneiss, mafic amphibolite, and leucogranite intrusions dated at similar to 16 and 63Ma. Zircon (U-Th)/He cooling ages are Oligocene through late Pliocene, with the youngest ages observed in the footwall of the SLD. We tested similar to 25,000 unique thermokinematic forward models in Pecube against the structural and (U-Th)/He data to fully bracket the allowable ranges in fault initiations, accelerations, and slip rates. We find that normal faulting in the SLR began in the middle Miocene with horizontal extension rates of similar to 1mm a(-1), and in the north accelerated at 8Ma to 2.5-3.0mm a(-1) as faulting commenced on the SLD. Cumulative horizontal extension across the SLR ranges from <10km in the south to 19-21km in the north.
关键词	INDIA-ASIA COLLISION ANGLE NORMAL-FAULT LOW-TEMPERATURE THERMOCHRONOMETRY METAMORPHIC CORE COMPLEXES TECTONIC EVOLUTION SUTURE ZONE HEAT-FLOW SHEAR-ZONE LITHOSPHERIC STRUCTURE PARALLEL EXTENSION
英文关键词	Tibet; low-angle normal faults; rifting; (U-Th); He
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000324949500006
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/258221
推荐引用方式 GB/T 7714	Styron, Richard H.,Taylor, Michael H.,Sundell, Kurt E.,et al. Miocene initiation and acceleration of extension in the South Lunggar rift, western Tibet: Evolution of an active detachment system from structural mapping and (U-Th)/He thermochronology[J]. 中国科学院青藏高原研究所,2013,32(4).
APA	Styron, Richard H..,Taylor, Michael H..,Sundell, Kurt E..,Stockli, Daniel F..,Oalmann, Jeffrey A. G..,...&Ding, Lin.(2013).Miocene initiation and acceleration of extension in the South Lunggar rift, western Tibet: Evolution of an active detachment system from structural mapping and (U-Th)/He thermochronology.TECTONICS,32(4).
MLA	Styron, Richard H.,et al."Miocene initiation and acceleration of extension in the South Lunggar rift, western Tibet: Evolution of an active detachment system from structural mapping and (U-Th)/He thermochronology".TECTONICS 32.4(2013).