ISL OpenIR  > 青海盐湖研究所知识仓储
Optically stimulated luminescence dating of sandy deposits from Gulang county at the southern margin of the Tengger Desert, China
Peng Jun1; Dong Zhibao1; Han Fengqing2
2016-02-01
Source PublicationJOURNAL OF ARID LAND
Volume8Issue:1Pages:1-12
SubtypeArticle
AbstractAeolian 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.
KeywordOsl Dating Sandy Deposit Integration Interval Selection Aeolian Activity Tengger Desert
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
WOS KeywordQINGHAI-TIBETAN PLATEAU ; NORTHERN CHINA ; DUNE SANDS ; NORTHEASTERN CHINA ; AEOLIAN DEPOSITS ; FAST COMPONENT ; QUARTZ OSL ; TIME ; EVOLUTION ; SEDIMENTS
Indexed BySCI
Language英语
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000365032100001
Citation statistics
Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/6169
Collection青海盐湖研究所知识仓储
盐湖地质与环境实验室
Affiliation1.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
Recommended Citation
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.
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