Loess sedimentation in Tibet: provenance, processes, and link with Quaternary glaciations

doi:10.1016/j.quascirev.2007.05.003

	Loess sedimentation in Tibet: provenance, processes, and link with Quaternary glaciations
	Sun, Jimin ; Li, Sheng-Hua ; Muhs, Daniel R.; Li, Bo
刊名	QUATERNARY SCIENCE REVIEWS
	2007-09-01
卷号	26 期号:17-18 页码:2265-2280
ISSN号	0277-3791
DOI	10.1016/j.quascirev.2007.05.003
文献子类	Article
英文摘要	Well-preserved loess deposits are found on the foothills of mountains along the middle reaches of the Yarlung Zangbo River in southern Tibet. Optically stimulated luminescence (OSL) dating is used to determine loess ages by applying the single-aliquot regeneration technique. Geochemical, mineralogical, and granulometric measurements were carried out to allow a comparison between loess from Tibet and the Chinese Loess Plateau. Our results demonstrate that (i) the loess deposits have a basal age of 13-11 ka, suggesting they accumulated after the last deglaciation, (ii) loess in southern Tibet has a "glacial" origin, resulting from eolian sorting of glaciofluvial outwash deposits from braided river channels or alluvial fans by local near-surface winds, and (iii) the present loess in the interior of Tibet has accumulated since the last deglaciation when increased monsoonal circulation provided an increased vegetation cover that was sufficient for trapping eolian silt. The lack of full-glacial loess is either due to minimal vegetation cover or possibly due to the erosion of loess as glaciofluvial outwash during the beginning of each interglacial. Such processes would have been repeated during each glacial-interglacial cycle of the Quaternary. (c) 2007 Elsevier Ltd. All rights reserved.
WOS关键词	BASIN WESTERN TIBET ; SOUTHERN TIBET ; ICE CORE ; PALEOCLIMATIC SIGNIFICANCE ; GEOCHEMICAL EVIDENCE ; PALEOSOL SEQUENCE ; SUMMER MONSOON ; CENTRAL ALASKA ; EASTERN TIBET ; CENTRAL CHINA
WOS研究方向	Physical Geography ; Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000251378800015
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/68602]
专题	中国科学院地质与地球物理研究所
通讯作者	Sun, Jimin
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China 3.US Geol Survey, Denver Fed Ctr, Denver, CO 80225 USA
推荐引用方式 GB/T 7714	Sun, Jimin,Li, Sheng-Hua,Muhs, Daniel R.,et al. Loess sedimentation in Tibet: provenance, processes, and link with Quaternary glaciations[J]. QUATERNARY SCIENCE REVIEWS,2007,26(17-18):2265-2280.
APA	Sun, Jimin,Li, Sheng-Hua,Muhs, Daniel R.,&Li, Bo.(2007).Loess sedimentation in Tibet: provenance, processes, and link with Quaternary glaciations.QUATERNARY SCIENCE REVIEWS,26(17-18),2265-2280.
MLA	Sun, Jimin,et al."Loess sedimentation in Tibet: provenance, processes, and link with Quaternary glaciations".QUATERNARY SCIENCE REVIEWS 26.17-18(2007):2265-2280.