A luminescence dating study of loess deposits from the Yili River basinin western China

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	A luminescence dating study of loess deposits from the Yili River basinin western China
	ChongYi, E.; Lai, ZhongPing; Sun, YongJuan; Hou, GuangLiang; Yu, LuPeng; Wu, ChengYong
	2012
发表期刊	QUATERNARY GEOCHRONOLOGY
ISSN	1871-1014
卷号	10 期号:*页码:50-55
关键词	Quartz Luminescence Dating Zeketai (Zkt) Loess Section Yili River
摘要	The loess deposits surrounding the high mountainous regions of Central Asia play an important role in understanding environmental changes in Eurasia on orbital and sub-orbital timescales. However, problems with dating Central Asian loess have limited the interpretation of climatic and environmental data, especially on sub-orbital timescales. We selected a controversial loess section, Zeketai (ZKT, with a thickness of 23 m), in the Yili basin in Xinjiang Province in western China, to establish a detailed and systematic Optically Stimulated Luminescence (OSL) chronology. Quartz grains of 38-63 mu m were isolated from 15 samples and the single-aliquot regenerative-dose (SAR) protocol was employed for D-e determination. OSL ages are in stratigraphic order and range from 13.8 +/- 1 to 72 +/- 6 ka, suggesting continuous loess accumulation during the last glaciation. We compared these dating results with that of the previously published fine-grain sized quartz (4-11 mu m) using simplified multiple aliquot regenerative-dose (SMAR) protocol, and with the previous published radiocarbon dating (C-14) ages on snail shells. With the exception of three young samples from the upper 6 m of the section, the SMAR dating results are basically consistent with the results using the SAR protocol. Both the SMAR and SAR OSL ages are consistently older than the C-14 ages, and the radiocarbon date results should be used with caution since they appear to have been underestimated. (C) 2012 Elsevier B.V. All rights reserved. The loess deposits surrounding the high mountainous regions of Central Asia play an important role in understanding environmental changes in Eurasia on orbital and sub-orbital timescales. However, problems with dating Central Asian loess have limited the interpretation of climatic and environmental data, especially on sub-orbital timescales. We selected a controversial loess section, Zeketai (ZKT, with a thickness of 23 m), in the Yili basin in Xinjiang Province in western China, to establish a detailed and systematic Optically Stimulated Luminescence (OSL) chronology. Quartz grains of 38-63 mu m were isolated from 15 samples and the single-aliquot regenerative-dose (SAR) protocol was employed for D-e determination. OSL ages are in stratigraphic order and range from 13.8 +/- 1 to 72 +/- 6 ka, suggesting continuous loess accumulation during the last glaciation. We compared these dating results with that of the previously published fine-grain sized quartz (4-11 mu m) using simplified multiple aliquot regenerative-dose (SMAR) protocol, and with the previous published radiocarbon dating (C-14) ages on snail shells. With the exception of three young samples from the upper 6 m of the section, the SMAR dating results are basically consistent with the results using the SAR protocol. Both the SMAR and SAR OSL ages are consistently older than the C-14 ages, and the radiocarbon date results should be used with caution since they appear to have been underestimated. (C) 2012 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/363002/2041
专题	青海盐湖研究所知识仓储
推荐引用方式 GB/T 7714	ChongYi, E.,Lai, ZhongPing,Sun, YongJuan,et al. A luminescence dating study of loess deposits from the Yili River basinin western China[J]. QUATERNARY GEOCHRONOLOGY,2012,10(*):50-55.
APA	ChongYi, E.,Lai, ZhongPing,Sun, YongJuan,Hou, GuangLiang,Yu, LuPeng,&Wu, ChengYong.(2012).A luminescence dating study of loess deposits from the Yili River basinin western China.QUATERNARY GEOCHRONOLOGY,10(*),50-55.
MLA	ChongYi, E.,et al."A luminescence dating study of loess deposits from the Yili River basinin western China".QUATERNARY GEOCHRONOLOGY 10.*(2012):50-55.

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