气候变化领域集成服务门户(CCPortal): New constraints on the late Quaternary landscape evolution of the eastern Tibetan Plateau from 10Be and 26Al in-situ cosmogenic nuclides

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DOI	10.1016/j.quascirev.2019.07.020
	New constraints on the late Quaternary landscape evolution of the eastern Tibetan Plateau from 10Be and 26Al in-situ cosmogenic nuclides
	Yang Y.; Liu C.-Q.; Van der Woerd J.; Xu S.; Cui L.-F.; Zhao Z.-Q.; Wang Q.-L.; Jia G.-D.; Chabaux F.
发表日期	2019
ISSN	0277-3791
起始页码	244
结束页码	262
卷号	220
英文摘要	Based on Terrestrial Cosmogenic Nuclide (TCN) constraints from depth profiles of one granitic regolith from Wumingshan and five fluvial terraces from Xianshuihe and Zagunao rivers, we discuss the timing of the last deglaciation, the landscape-scale denudation and fluvial incision rates across the eastern Tibetan Plateau, in relation to previous work. We present a three-dimensional-graph visualization approach and corresponding constraints to better assess the feasibility and applicability of cosmogenic nuclides depth-profile dating. The exposure age (older than 19.4 ka) of the Wumingshan regolith corresponds to the retreat of the palaeo-Daocheng ice cap, which covered the Yidun terrane during the Last Glacial Maximum (LGM). Most basin-wide denudation rate data in the eastern Tibetan Plateau are lower than 130 mm/ka (47%, n = 90), which is consistent with the Wumingshan regolith denudation rate (lower than 52.8 mm/ka), and thus indicate that the landscape-scale denudation has been stabilized after the last deglaciation. Considering the reduction of integrated bulk density due to the accumulation of lower-density loess, we estimate mean exposure ages of Xianshuihe and Zagunao river terraces of 4.0 ± 0.7 ka, 5.9 ± 0.3 ka, 13.4 ± 2.0 ka, and 16.6 ± 1.4 ka. The observed increase in incision rate from 0.39 mm/yr over long timescale (∼600 ka) to 5.88 mm/yr over the last 15 ka at the Xianshuihe river site is probably due to the transition from glacial to interglacial climatic conditions. The fewer abandoned terraces along the Zagunao river after the Heinrich event 1 (H1) indicates that the climate change during the latest glacial-interglacial transition impacted less the landscape evolution in a relatively lower elevation area. Comparison with previously reported fluvial incision rates elsewhere across the eastern margin of the Tibetan Plateau indicates that incision rates are mainly influenced by abrupt climate change or intensified summer monsoon since the early Holocene, but probably controlled by regional tectonic uplift or fluvial headward retreat as the timescale increases. Overall, we propose a synthetic pattern of landscape evolution mainly dominated by long-term tectonic uplift together with fluvial headward erosion, episodically influenced by climatic change throughout the late Quaternary. © 2019 Elsevier Ltd
英文关键词	Climate change; Cosmogenic nuclides; Denudation rate; Eastern Tibetan plateau; Fluvial incision; Late Quaternary; Regolith
语种	英语
scopus关键词	Erosion; Glacial geology; Isotopes; Rivers; Tectonics; Three dimensional computer graphics; Cosmogenic nuclides; Denudation rates; Eastern Tibetan plateau; Fluvial incision; Late quaternary; Regolith; Climate change; aluminum; beryllium isotope; climate change; climate conditions; cosmogenic radionuclide; dating method; denudation; glacial-interglacial cycle; ice cap; incised valley; landscape evolution; last deglaciation; paleoclimate; paleoenvironment; Quaternary; regolith; terrace; visualization; China; Qinghai-Xizang Plateau; Sichuan; Xianshui River; Zagunao River
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151799
作者单位	Institute of Surface-Earth System Science, Tianjin University, Tianjin, 300072, China; State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China; Laboratoire d'Hydrologie et de Géochimie de Strasbourg (LHyGeS), CNRS UMR 7517, University of Strasbourg, 1 rue Blessig, Strasbourg cedex, 67084, France; Institut de Physique du Globe de Strasbourg (IPGS), CNRS UMR 7516, University of Strasbourg, 5 rue René Descartes, Strasbourg cedex, 67084, France; School of Earth Sciences and Recourses, Chang'an University, Xi'an, 710054, China
推荐引用方式 GB/T 7714	Yang Y.,Liu C.-Q.,Van der Woerd J.,et al. New constraints on the late Quaternary landscape evolution of the eastern Tibetan Plateau from 10Be and 26Al in-situ cosmogenic nuclides[J],2019,220.
APA	Yang Y..,Liu C.-Q..,Van der Woerd J..,Xu S..,Cui L.-F..,...&Chabaux F..(2019).New constraints on the late Quaternary landscape evolution of the eastern Tibetan Plateau from 10Be and 26Al in-situ cosmogenic nuclides.Quaternary Science Reviews,220.
MLA	Yang Y.,et al."New constraints on the late Quaternary landscape evolution of the eastern Tibetan Plateau from 10Be and 26Al in-situ cosmogenic nuclides".Quaternary Science Reviews 220(2019).