Holocene moist period recorded by the chronostratigraphy of a lakesedimentary sequence from Lake Tangra Yumco on the south Tibetan Plateau

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	Holocene moist period recorded by the chronostratigraphy of a lakesedimentary sequence from Lake Tangra Yumco on the south Tibetan Plateau
	Long, Hao; Lai, ZhongPing; Frenzel, Peter; Fuchs, Markus; Haberzettl, Torsten
	2012
发表期刊	QUATERNARY GEOCHRONOLOGY
ISSN	1871-1014
卷号	10 页码:136-142
关键词	Osl Dating Radiocarbon Dating Lake Sediments Tibetan Plateau
摘要	Palaeolimnological studies together with geomorphological investigations of exposed lacustrine sections on the Tibetan Plateau provided valuable palaeoclimate records. Radiocarbon dating is the most commonly used method for establishing chronologies of lake sediments. However, C-14 dating of such sediments could be problematic due to the lack of organic matter or a reservoir effect, which commonly appears in radiocarbon ages of lacustrine sediments from the Tibetan Plateau. OSL dating is an alternative for dating the lake sediments and also provides the opportunity to independently test radiocarbon chronologies. The current study tries to compare OSL and C-14 dating results in order to evaluate the reservoir effect of C-14 dating, and then based on quartz OSL dating and stratigraphic analysis, to construct the chronostratigraphy of a lacustrine sedimentary sequence (TYC section), an offshore profile from Tangra Yumco lake on the southern Tibetan Plateau. Results suggest that: (1) it is possible to obtain robust OSL age estimates for these lake sediments and the OSL ages of the three samples range from ca. 7.6 ka to ca. 2.3 ka; (2) The discrepancy between the OSL and C-14 ages is ca. 4-5 ka, which possibly results from the age overestimate of C-14 dating due to a reservoir effect in the studied lake; (3) the chronostratigraphy of TYC section and sedimentological environmental analysis show a large lake with a lake level distinctively above the present during ca. 7.6-2.7 ka indicating a wet mid-Holocene in the study area. (C) 2011 Elsevier B.V. All rights reserved. Palaeolimnological studies together with geomorphological investigations of exposed lacustrine sections on the Tibetan Plateau provided valuable palaeoclimate records. Radiocarbon dating is the most commonly used method for establishing chronologies of lake sediments. However, C-14 dating of such sediments could be problematic due to the lack of organic matter or a reservoir effect, which commonly appears in radiocarbon ages of lacustrine sediments from the Tibetan Plateau. OSL dating is an alternative for dating the lake sediments and also provides the opportunity to independently test radiocarbon chronologies. The current study tries to compare OSL and C-14 dating results in order to evaluate the reservoir effect of C-14 dating, and then based on quartz OSL dating and stratigraphic analysis, to construct the chronostratigraphy of a lacustrine sedimentary sequence (TYC section), an offshore profile from Tangra Yumco lake on the southern Tibetan Plateau. Results suggest that: (1) it is possible to obtain robust OSL age estimates for these lake sediments and the OSL ages of the three samples range from ca. 7.6 ka to ca. 2.3 ka; (2) The discrepancy between the OSL and C-14 ages is ca. 4-5 ka, which possibly results from the age overestimate of C-14 dating due to a reservoir effect in the studied lake; (3) the chronostratigraphy of TYC section and sedimentological environmental analysis show a large lake with a lake level distinctively above the present during ca. 7.6-2.7 ka indicating a wet mid-Holocene in the study area. (C) 2011 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/363002/2043
专题	青海盐湖研究所知识仓储
推荐引用方式 GB/T 7714	Long, Hao,Lai, ZhongPing,Frenzel, Peter,et al. Holocene moist period recorded by the chronostratigraphy of a lakesedimentary sequence from Lake Tangra Yumco on the south Tibetan Plateau[J]. QUATERNARY GEOCHRONOLOGY,2012,10:136-142.
APA	Long, Hao,Lai, ZhongPing,Frenzel, Peter,Fuchs, Markus,&Haberzettl, Torsten.(2012).Holocene moist period recorded by the chronostratigraphy of a lakesedimentary sequence from Lake Tangra Yumco on the south Tibetan Plateau.QUATERNARY GEOCHRONOLOGY,10,136-142.
MLA	Long, Hao,et al."Holocene moist period recorded by the chronostratigraphy of a lakesedimentary sequence from Lake Tangra Yumco on the south Tibetan Plateau".QUATERNARY GEOCHRONOLOGY 10(2012):136-142.