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History and variability of Asian interior aridity recorded by eolian flux in the Chinese Loess Plateau during the past 7 Ma

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Abstract

Eolian flux in the Chinese Loess Plateau was reconstructed by measuring the dry bulk density and CaCO3 content of the late Cenozoic loess-paleosol-red clay sequences in the Lingtai profile. Comparison of eolian flux variation between the Lingtai profile and the ODP sites 885/886 in the North Pacific shows a significant wet-dry variability in addition to a gradual drying trend in the dust source regions in interior Asia. Especially, the increase of eolian fluxes from both continental and pelagic eolian sediments indicates a sharp drying of the dust source regions between 3.6 and 2.6 MaBP, which might be attributed to the tectonic uplift of the Tibetan Plateau, which cut down the moisture input to the interior Asia. The average value and variability of eolian flux are higher after 2.6 MaBP than before, which may be related to the Quaternary climatic fluctuations on the glacial-interglacial timescale after the commencement of major Northern Hemisphere Glaciations. The eolian fluxes of the Lingtai profile and Core V21-146 in northwest Pacific show a synchronous variation on the 103-105 a timescale, indicating that the flux variations from both continental and marine records are closely correlated to the Quaternary climatic fluctuation forced by the ice volume changes on a global scale.

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Authors and Affiliations

  1. Institute of Earth Environment, State Key Laboratory of Loess and Quaternary Geology, Chinese Academy of Sciences, 710075, Xi’an, China

    Youbin Sun & Zhisheng An

  2. Institute of Oceanology, Chinese Academy of Sciences, 266071, Qingdao, China

    Youbin Sun

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  1. Youbin Sun
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  2. Zhisheng An
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Correspondence to Youbin Sun.

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Sun, Y., An, Z. History and variability of Asian interior aridity recorded by eolian flux in the Chinese Loess Plateau during the past 7 Ma. Sci. China Ser. D-Earth Sci. 45, 420–429 (2002). https://doi.org/10.1360/02yd9044

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  • DOI: https://doi.org/10.1360/02yd9044

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