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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
Source PublicationQUATERNARY GEOCHRONOLOGY
ISSN1871-1014
Volume10Issue:*Pages:50-55
AbstractThe 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.
KeywordQuartz Luminescence Dating Zeketai (Zkt) Loess Section Yili River
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/2041
Collection青海盐湖研究所知识仓储
Recommended Citation
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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