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DOI	10.1016/j.quageo.2013.11.004
	Evaluating OSL-SAR protocols for dating quartz grains from the loess in Ili Basin, Central Asia
	Yang, Shengli; Forman, Steven L.; Song, Yougui; Pierson, James; Mazzocco, Jeaneth; Li, Xinxin; Shi, Zhengtao; Fang, Xiaomin
通讯作者	Yang, SL (通讯作者)
发表日期	2014
ISSN	1871-1014
EISSN	1878-0350
起始页码	78
结束页码	88
卷号	20
英文摘要	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. (C) 2013 Elsevier B.V. All rights reserved.
关键词	OPTICALLY STIMULATED LUMINESCENCE CHINESE LOESS PLEISTOCENE LOESS ACTIVATION-ANALYSIS TASHKENT REGION SINGLE DEPOSITS DUST SEDIMENTS RECORD
英文关键词	Luminescence dating; SAR; Loess; Desert; Ili Basin; Central Asia
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000331859500008
来源期刊	QUATERNARY GEOCHRONOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258385
推荐引用方式 GB/T 7714	Yang, Shengli,Forman, Steven L.,Song, Yougui,et al. Evaluating OSL-SAR protocols for dating quartz grains from the loess in Ili Basin, Central Asia[J]. 中国科学院青藏高原研究所,2014,20.
APA	Yang, Shengli.,Forman, Steven L..,Song, Yougui.,Pierson, James.,Mazzocco, Jeaneth.,...&Fang, Xiaomin.(2014).Evaluating OSL-SAR protocols for dating quartz grains from the loess in Ili Basin, Central Asia.QUATERNARY GEOCHRONOLOGY,20.
MLA	Yang, Shengli,et al."Evaluating OSL-SAR protocols for dating quartz grains from the loess in Ili Basin, Central Asia".QUATERNARY GEOCHRONOLOGY 20(2014).