Optically stimulated luminescence dating of sandy deposits from Gulang county at the southern margin of the Tengger Desert, China
文献类型：期刊论文
| 作者 | Peng Jun1; Dong Zhibao1; Han Fengqing2
|
| 刊名 | JOURNAL OF ARID LAND
 |
| 出版日期 | 2016-02-01 |
| 卷号 | 8期号:1页码:1-12 |
| 关键词 | Osl Dating Sandy Deposit Integration Interval Selection Aeolian Activity Tengger Desert |
| 文献子类 | Article |
| 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 similar to 2.3 ka might be related to an increased aridity during the Late Holocene. |
| WOS关键词 | QINGHAI-TIBETAN PLATEAU ; NORTHERN CHINA ; DUNE SANDS ; NORTHEASTERN CHINA ; AEOLIAN DEPOSITS ; FAST COMPONENT ; QUARTZ OSL ; TIME ; EVOLUTION ; SEDIMENTS |
| WOS研究方向 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:000365032100001 |
| 源URL | [http://ir.isl.ac.cn/handle/363002/6169]  |
| 专题 | 青海盐湖研究所_青海盐湖研究所知识仓储 青海盐湖研究所_盐湖地质与环境实验室 |
| 作者单位 | 1.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Key Lab Desert & Desertificat, Lanzhou 730000, Peoples R China 2.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R 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]. JOURNAL OF ARID LAND,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. |
入库方式： OAI收割
来源：青海盐湖研究所
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