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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
发表期刊QUATERNARY GEOCHRONOLOGY
卷号20页码:78-88
文章类型期刊论文
摘要

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.

关键词Luminescence Dating Sar Loess Desert Ili Basin Central Asia
DOI10.1016/j.quageo.2013.11.004
收录类别SCI
语种英语
引用统计
被引频次:25[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/9831
专题古环境研究室
通讯作者Yang, SL (Yang, Shengli)[ 1,2 ]
作者单位1.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
推荐引用方式
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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