干旱区生态环境知识资源中心(Arid): Optically stimulated luminescence dating of sandy deposits from Gulang county at the southern margin of the Tengger Desert, China

Arid

	Optically stimulated luminescence dating of sandy deposits from Gulang county at the southern margin of the Tengger Desert, China
	Peng Jun; Dong Zhibao; Han Fengqing
来源期刊	Journal of Arid Land
ISSN	1674-6767
出版年	2016
卷号	8 期号:1 页码:1-12
英文摘要	Aeolian deposits from the deserts in northern China have been used for palaeoenvironmental research to understand aeolian sedimentology and its dynamic connection to past climate conditions. The Tengger Desert in China is sensitive to the waxing and waning of the monsoonal system. In response to past climate change, the southern margin of the Tengger Desert has evolved significantly since the last glacial period. However, previous attempts to date aeolian deposits in this region were mainly based on radiocarbon dating, which has problems when applied to aeolian deposits. Moreover, sedimentary records are limited. Accordingly, past aeolian activity in this desert remains poorly understood. In the present study, we dated sand samples from Gulang county at the southern margin of the Tengger Desert using optically stimulated luminescence (OSL) to understand the history of aeolian activity in this region. Our samples represented well-sorted aeolian sands and sandy loess. Aeolian sands are evidence of dune field buildup and sparse vegetation cover whereas sandy loess is evidence of improved stabilization of sand dunes resulting from ameliorated vegetation cover. Certain samples showed a decline in the equivalent dose (D_e) values when successive integration intervals were applied, which resulted from unstable OSL signals from non-fast components in the initial part of the decay curve. In order to obtain reliable D_e estimates, we investigated component-resolved and different background subtraction approaches, and compared the resultant D_e estimates. We adopted the early background subtraction method to derive D_e values. Luminescence chronologies and sedimentary records indicated that sand dunes accumulation occurred before 10 ka, and sandy loess developed between 9.5 and 7.6 ka when sand dunes were stabilized as a result of increased effective moisture levels. The transition between sand dune mobilization and stabilization emphasizes the significance of an effective moisture threshold in controlling aeolian activity. Mobilization of sand dunes at ~2.3 ka might be related to an increased aridity during the Late Holocene.
英文关键词	OSL dating sandy deposit integration interval selection aeolian activity Tengger Desert
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Geology
CSCD记录号	CSCD:5614051
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335592
作者单位	Peng Jun, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Key Laboratory of Desert and Desertification, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.; Dong Zhibao, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Key Laboratory of Desert and Desertification, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.; Han Fengqing, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China.
推荐引用方式 GB/T 7714	Peng Jun,Dong Zhibao,Han Fengqing. Optically stimulated luminescence dating of sandy deposits from Gulang county at the southern margin of the Tengger Desert, China[J],2016,8(1):1-12.
APA	Peng Jun,Dong Zhibao,&Han Fengqing.(2016).Optically stimulated luminescence dating of sandy deposits from Gulang county at the southern margin of the Tengger Desert, China.Journal of Arid Land,8(1),1-12.
MLA	Peng Jun,et al."Optically stimulated luminescence dating of sandy deposits from Gulang county at the southern margin of the Tengger Desert, China".Journal of Arid Land 8.1(2016):1-12.