Optical dating of sand wedges and ice-wedge casts from Qinghai Lake area on the northeastern Qinghai-Tibetan Plateau and its palaeoenvironmental implications
Liu, XJ (Liu, Xiang-Jun)[ 1,2,3 ]; Lai, ZP (Lai, Zhong-Ping)[ 1,4 ]
2013-04-30
发表期刊BOREAS
卷号42期号:2页码:333-341
文章类型期刊论文
摘要

Sand wedges and ice-wedge casts in the Qinghai Lake area on the northeastern Qinghai-Tibetan Plateau (QTP) occur within alluvial gravel or river terrace deposits. In this study, we report the results of quartz Optically Stimulated Luminescence (OSL) dating of the infill of five relict sand wedges and one ice-wedge cast. Combining our dating results with previously published luminescence ages of permafrost wedges in the Qinghai Lake area, we show that sand/ice wedges formed at c.62ka, c. 45ka and between 30 and 15ka, and that the mean annual air temperature (MAAT) was depressed by at least approximate to 3 degrees C relative to present during the sand/ice-wedge formation periods. This new work is partially corroborated by post-LGM proxy records from lakes and aeolian deposits reported from the northeastern QTP. It also significantly extends the palaeoenvironmental record in the region in the period before the LGM, when other proxy records are rare, allowing a better understanding of the palaeoenvironmental conditions on the northeastern QTP.

DOI10.1111/j.1502-3885.2012.00288.x
收录类别SCI
语种英语
引用统计
被引频次:12[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/9961
专题黄土与第四纪地质国家重点实验室(2010~)
通讯作者Liu, XJ (Liu, Xiang-Jun)[ 1,2,3 ]
作者单位1.State Key Laboratory of Cryosphere Sciences, Cold and Arid RegionsEnvironmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2.StateKey Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences,Xi’an 710075, China;
3.Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;
4.KeyLaboratory of Qinghai-Tibetan Plateau Environment and Resource (MOE), School of Life and Geographic Science,Qinghai Normal University, Xining 810008, China
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GB/T 7714
Liu, XJ ,Lai, ZP . Optical dating of sand wedges and ice-wedge casts from Qinghai Lake area on the northeastern Qinghai-Tibetan Plateau and its palaeoenvironmental implications[J]. BOREAS,2013,42(2):333-341.
APA Liu, XJ ,&Lai, ZP .(2013).Optical dating of sand wedges and ice-wedge casts from Qinghai Lake area on the northeastern Qinghai-Tibetan Plateau and its palaeoenvironmental implications.BOREAS,42(2),333-341.
MLA Liu, XJ ,et al."Optical dating of sand wedges and ice-wedge casts from Qinghai Lake area on the northeastern Qinghai-Tibetan Plateau and its palaeoenvironmental implications".BOREAS 42.2(2013):333-341.
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