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Evaluating OSL-SAR protocols for dating quartz grains from the loess in Ili Basin, Central Asia
Yang, SL (Yang, Shengli)[ 1,2 ]; Forman, SL (Forman, Steven L.)[ 3 ]; Song, YG (Song, Yougui)[ 4 ]; Pierson, J (Pierson, James)[ 3 ]; Mazzocco, J (Mazzocco, Jeaneth)[ 3 ]; Li, XX (Li, Xinxin)[ 4 ]; Shi, ZT (Shi, Zhengtao)[ 5 ]; Fang, XM (Fang, Xiaomin)[ 6 ]
2014-02-15
Source PublicationQUATERNARY GEOCHRONOLOGY
Volume20Pages:78-88
Subtype期刊论文
Abstract

Late Pleistocene records of loess deposition are a critical archive for understanding terrestrial paleo-environment changes in Central Asia. The age of loess is not well known for the deserts regions and surrounding high plateaus in Central Asia. Previous studies have shown that there remains a disparity between ages for loess deposition by luminescence and C-14 dating. This study evaluates the potential of optically stimulated luminescence (OSL) to date a loess sequence resting on fluvial sands in the east Ili Basin, Central Asia. The single-aliquot regenerative-dose (SAR) protocol on coarse grain quartz was employed for equivalent dose determinations. The basal fluvial sand returned a secure OSL age, with low overdispersion value in equivalent doses (19 +/- 2%) of ca. 36 ka and provides a close, but maximum age estimate (within 5 ka) on the initiation of loess deposition. However, the loess yielded high overdispersion values for equivalent doses and age reversals, coincident with diffuse paleosols; indicating that pedoturbation with loess deposition may be a dominant process. OSL ages between ca. 45 and 14 ka calculated using a maximum age model and OSL ages from other sites in the Basin suggests that the latest major period of loess deposition was between 70 and 10 ka ago. A future hypothesis to test based on these analyses is that there may be three periods of heightened loess deposition at ca. 45, 35 to 19 and 14 ka, when desert source areas to the west were particularly dry.

KeywordLuminescence Dating Sar Loess Desert Ili Basin Central Asia
DOI10.1016/j.quageo.2013.11.004
Indexed BySCI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9831
Collection古环境研究室
Corresponding AuthorYang, SL (Yang, Shengli)[ 1,2 ]
Affiliation1.College of Geographical Sciences & Jiangsu Key Laboratory of Environmental Change and Ecological Construction, Nanjing Normal University, Nanjing,210023, China;
2.Luminescence Dating Research Laboratory, Department of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago 60607, USA;
3.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, 10 Fenghui Nan Road, Xi’an 710075,China;
4.School of Tourism and Geography, Yunnan Normal University, Kunming 650092, China;
5.Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
Recommended Citation
GB/T 7714
Yang, SL ,Forman, SL ,Song, YG ,et al. Evaluating OSL-SAR protocols for dating quartz grains from the loess in Ili Basin, Central Asia[J]. QUATERNARY GEOCHRONOLOGY,2014,20:78-88.
APA Yang, SL .,Forman, SL .,Song, YG .,Pierson, J .,Mazzocco, J .,...&Fang, XM .(2014).Evaluating OSL-SAR protocols for dating quartz grains from the loess in Ili Basin, Central Asia.QUATERNARY GEOCHRONOLOGY,20,78-88.
MLA Yang, SL ,et al."Evaluating OSL-SAR protocols for dating quartz grains from the loess in Ili Basin, Central Asia".QUATERNARY GEOCHRONOLOGY 20(2014):78-88.
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