气候变化领域集成服务门户(CCPortal): Late Quaternary Extension Rates Across the Northern Half of the Yadong-Gulu Rift: Implication for East-West Extension in Southern Tibet

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DOI	10.1029/2019JB019106
	Late Quaternary Extension Rates Across the Northern Half of the Yadong-Gulu Rift: Implication for East-West Extension in Southern Tibet
	Chevalier M.-L.; Tapponnier P.; van der Woerd J.; Leloup P.H.; Wang S.; Pan J.; Bai M.; Kali E.; Liu X.; Li H.
发表日期	2020
ISSN	21699313
卷号	125 期号:7
英文摘要	The presence of ~NS-trending rifts within the Tibetan Plateau attests that it is undergoing ~EW extension. In southern Tibet, the total extension rate, distributed across seven main rifts over a distance of ~1,000 km, has been inferred to amount to about half of the shortening rate across the Himalayas. Quantifying the late Quaternary extension rates across the largest rift (Yadong-Gulu rift [YGR]) is important to understand Tibetan deformation and to discuss the high plateau evolution during the later stages of continental collision. We performed 10Be surface-exposure cosmogenic nuclide dating of 57 samples from three fluvial surfaces and two moraines that are vertically offset by the normal faults bounding the northern YGR. After carefully assessing individual ages at each site, to elucidate scatter in the age distributions, we obtained ~EW extension rates of up to 3–6 mm/yr near the northern end of the rift (Gulu) and of only 1.3 ± 0.3 mm/yr in the south (Yangbajing). The fast rates in the north may be influenced by dextral slip along the Beng Co fault, whose rate ought to be at least 6.0 ± 1.8 mm/yr. The total late Quaternary extension rate of 9 ± 2 mm/yr we infer across southern Tibet between ~81°E and 92°E, assuming similar rates across each rift, is similar to earlier, qualitative inferences and consistent with recent geodetic results. Distinct deformation rates north and south of the Bangong-Nujiang suture may reflect significant differences between the extensional kinematics and mechanisms across the Qiangtang and Lhasa blocks. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	10Be cosmogenic isotope dating; active tectonics; extension rate; Nyainqentanghla; South Tibet; throw rate; Yadong-Gulu rift
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187794
作者单位	Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, China; Institute of Crustal Dynamics, China Earthquake Administration, Beijing, China; Institut de Physique du Globe de Strasbourg, UMR 7516 CNRS, Université de Strasbourg, Strasbourg, France; Laboratoire de géologie de Lyon, CNRS UMR 5570, Université de Lyon, Villeurbanne, France; Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Chevalier M.-L.,Tapponnier P.,van der Woerd J.,et al. Late Quaternary Extension Rates Across the Northern Half of the Yadong-Gulu Rift: Implication for East-West Extension in Southern Tibet[J],2020,125(7).
APA	Chevalier M.-L..,Tapponnier P..,van der Woerd J..,Leloup P.H..,Wang S..,...&Li H..(2020).Late Quaternary Extension Rates Across the Northern Half of the Yadong-Gulu Rift: Implication for East-West Extension in Southern Tibet.Journal of Geophysical Research: Solid Earth,125(7).
MLA	Chevalier M.-L.,et al."Late Quaternary Extension Rates Across the Northern Half of the Yadong-Gulu Rift: Implication for East-West Extension in Southern Tibet".Journal of Geophysical Research: Solid Earth 125.7(2020).