Late Pleistocene genesis of the middle Yarlung Zhangbo Valley, southernTibet (China), as deduced by sedimentological and luminescence data

ISL OpenIR > 青海盐湖研究所知识仓储

	Late Pleistocene genesis of the middle Yarlung Zhangbo Valley, southernTibet (China), as deduced by sedimentological and luminescence data
	Kaiser, Knut; Lai, Zhongping; Schneider, Birgit; Junge, Frank W.
	2010
发表期刊	QUATERNARY GEOCHRONOLOGY
ISSN	1871-1014
卷号	5 期号:2-3 页码:200-204
摘要	Knowledge on valley formation and palaeohydrology of the Yarlung Zhangbo (named Brahmaputra south of the Himalayas) is still in an early stage. Research was conducted in the middle valley reach around Gonggar in order to investigate the sediment properties, age and palaeoenvironmental implication of a widespread aggradational valley terrace. This heavily dissected terrace, lying c. 25 m above the present floodplain, consists of topping aeolian and colluvial deposits, intermediate lacustrine fines and basal fluvial sands. Sedimentological properties of the lacustrine layers suggest a cold-climate depositional environment. Geochemical data refer to a common provenance of all sediments investigated from a regional catchment area, implying a local provenance of topping loesses and sands by aeolian sorting of nearby fluvial deposits. OSL dates, representing the first luminescence dating effort partly applied to non-aeolian sediments in this valley, cluster closely in the interval 11.7 +/- 0.8-17.4 +/- 1.4 ka. During the Late Pleistocene (until c. 16 ka) the investigated middle valley reach around Gonggar was occupied by a lake attaining an extension of at least 100 km. (C) 2009 Elsevier B.V. All rights reserved. Knowledge on valley formation and palaeohydrology of the Yarlung Zhangbo (named Brahmaputra south of the Himalayas) is still in an early stage. Research was conducted in the middle valley reach around Gonggar in order to investigate the sediment properties, age and palaeoenvironmental implication of a widespread aggradational valley terrace. This heavily dissected terrace, lying c. 25 m above the present floodplain, consists of topping aeolian and colluvial deposits, intermediate lacustrine fines and basal fluvial sands. Sedimentological properties of the lacustrine layers suggest a cold-climate depositional environment. Geochemical data refer to a common provenance of all sediments investigated from a regional catchment area, implying a local provenance of topping loesses and sands by aeolian sorting of nearby fluvial deposits. OSL dates, representing the first luminescence dating effort partly applied to non-aeolian sediments in this valley, cluster closely in the interval 11.7 +/- 0.8-17.4 +/- 1.4 ka. During the Late Pleistocene (until c. 16 ka) the investigated middle valley reach around Gonggar was occupied by a lake attaining an extension of at least 100 km. (C) 2009 Elsevier B.V. All rights reserved.
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/1923
专题	青海盐湖研究所知识仓储
推荐引用方式 GB/T 7714	Kaiser, Knut,Lai, Zhongping,Schneider, Birgit,et al. Late Pleistocene genesis of the middle Yarlung Zhangbo Valley, southernTibet (China), as deduced by sedimentological and luminescence data[J]. QUATERNARY GEOCHRONOLOGY,2010,5(2-3):200-204.
APA	Kaiser, Knut,Lai, Zhongping,Schneider, Birgit,&Junge, Frank W..(2010).Late Pleistocene genesis of the middle Yarlung Zhangbo Valley, southernTibet (China), as deduced by sedimentological and luminescence data.QUATERNARY GEOCHRONOLOGY,5(2-3),200-204.
MLA	Kaiser, Knut,et al."Late Pleistocene genesis of the middle Yarlung Zhangbo Valley, southernTibet (China), as deduced by sedimentological and luminescence data".QUATERNARY GEOCHRONOLOGY 5.2-3(2010):200-204.