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题名: A luminescence dating study of loess deposits from the Yili River basinin western China
作者: ChongYi, E. ;  赖忠平 ;  孙永娟 ;  Hou, GuangLiang ;  Yu, LuPeng ;  Wu, ChengYong
刊名: QUATERNARY GEOCHRONOLOGY
出版日期: 2012
卷号: 10, 期号:*, 页码:50-55
关键词: Quartz luminescence dating ;  Zeketai (ZKT) loess section ;  Yili River
英文摘要: 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.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.isl.ac.cn/handle/363002/2041
Appears in Collections:青海盐湖研究所知识仓储(2014年之前)_期刊论文

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Recommended Citation:
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.
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