Stepwise advance of the Mu Us Desert since late Pliocene: Evidence from a red clay-loess record |
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Authors: | Zhongli Ding Jimin Sun Dongsheng Liu |
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Institution: | (1) Institute of Geology, Chinese Academy of Sciences, 100029 Beijing, China |
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Abstract: | Analyses of paleomagnetic polanty reversals, magnetic susceptibility and grain size on the red clay-loess sequence, about
280 m thick, at Jingbian show that this sequence contains most of the stratigraphic units recorded in the standard red clay-loess
sections of the Loess Plateau over the past 3.5 Ma. Using sand particle percentage (> 63 μm%) of the eolian sequence as a
proxy indicator of desert extent and aridity in the dust source regions, it is found that during the past 3.5 Ma, there are
three important climatic events indicating the advance of the Mu Us Desert. The events occurred at about 2.6, 1.1 and 0.6
MaBP, respectively. The stepwise advance of the Mu Us Desert may be linked closely to increase in global ice volume and uplift
of the Tibetan Plateau in the late Cenozoic. |
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Keywords: | loess desert Quaternary |
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