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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (2): 453-462    DOI: 10.7522/j.issn.1000-694X.2013.00062
    
OSL Chronology of Paleodunes in the Middle and Southwestern Qaidam Basin, China
YU Lu-peng1,2,3, LAI Zhong-ping2,3, AN Ping1
1.Qinghai Geological Survey Institute, Xining 810012, China;
2.State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
3.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xian 710075, China
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Abstract  

Aeolian sediments are widely distributed in the Qaidam Basin, northeastern Qinghai-Tibetan Plateau (QTP). The paleodunes are mainly located at the southeastern, middle and southwestern Qaidam Basin. Chronology of the paleodunes in the southeastern Qaidam Basin have been well studied recently, however, ages of paleodunes in the middle and southwestern Qaidam Basin have not been reported, though they are close to and might connected to the evolution of the salt lakes in the central basin. In this study, we use single aliquot regeneration (SAR) protocol of Optically Stimulated Luminescence (OSL) to date the dune sand in the two regions. Results showed that: (1) Sand accumulation in these regions started at 4-3 ka and lasted to  0.5 ka when they were stabilized, according to the arid climate in the late Holocene. (2) The underlying fluvial sand was formed during the deglaciation at 12.6±0.8 ka. (3) The stabilization periods of the paleodunes were corresponding to the advance stages of the glacier in the northeastern QTP, during which the lower temperature caused the decrease of the evaporation and increase of the effective moisture indirectly, and this caused the increase of the vegetation and stabilization of the dunes.

Key words:  Qaidam Basin      aeolian sediments      paleodunes      Luminescence dating      Holocene     
Published:  20 March 2013
ZTFLH:  P53  
Articles by authors
YU Lu-peng1
2
3
LAI Zhong-ping2
3
AN Ping1

Cite this article: 

YU Lu-peng1,2,3, LAI Zhong-ping2,3, AN Ping1. OSL Chronology of Paleodunes in the Middle and Southwestern Qaidam Basin, China. JOURNAL OF DESERT RESEARCH, 2013, 33(2): 453-462.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00062     OR     http://www.desert.ac.cn/EN/Y2013/V33/I2/453

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