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.
通讯作者	Chevalier, ML (通讯作者)
发表日期	2020
ISSN	2169-9313
EISSN	2169-9356
卷号	125 期号:7
英文摘要	The presence of similar to NS-trending rifts within the Tibetan Plateau attests that it is undergoing similar to EW extension. In southern Tibet, the total extension rate, distributed across seven main rifts over a distance of similar to 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 Be-10 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 similar to 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 similar to 81 degrees E and 92 degrees 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.
关键词	FAULT PLANE SOLUTIONS CRUSTAL DEFORMATION ACTIVE TECTONICS KARAKORAM FAULT SLIP-RATE NYAINQENTANGLHA MOUNTAINS OBLIQUE CONVERGENCE EXPOSURE AGES KUNLUN FAULT FOCAL DEPTHS
英文关键词	South Tibet; active tectonics; Be-10 cosmogenic isotope dating; Yadong-Gulu rift; extension rate; throw rate; Nyainqentanghla
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000577118900011
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
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/260066
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]. 中国科学院青藏高原研究所,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).