Loess‐Like Dust Appearance at 40 Ma in Central China,Paleoceanography and Paleoclimatology

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Loess‐Like Dust Appearance at 40 Ma in Central China
Paleoceanography and Paleoclimatology ( IF 3.5 ) Pub Date : 2021-02-02 , DOI: 10.1029/2020pa003993
Niels Meijer ₁ , Guillaume Dupont‐Nivet _{1,

2,

3} , Natasha Barbolini _{4,

5} , Amber Woutersen ₅ , Alexander Rohrmann ₆ , Yang Zhang ₃ , Xiang‐Jun Liu ₇ , Alexis Licht ₈ , Hemmo A. Abels ₉ , Carina Hoorn ₅ , Rik Tjallingii ₁₀ , Christoff Andermann ₁₀ , Michael Dietze ₁₀ , Norbert Nowaczyk ₁₀

Affiliation

Institute for Geosciences Universität Potsdam 14476 Potsdam Germany
Univ Rennes CNRS Géosciences Rennes ‐ UMR CNRS 6118 F‐35000 Rennes France
Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education School of Earth and Space Sciences Peking University Beijing100871 China
Department of Ecology Environment and Plant Sciences and Bolin Centre for Climate Research Stockholm University SE‐106 91 Sweden
Department of Ecosystem and Landscape Dynamics (ELD) Institute for Biodiversity and Ecosystem Dynamics (IBED) University of Amsterdam Amsterdam1090 GE the Netherlands
Institute of Geological Sciences Freie Universität Berlin Berlin Germany
College of Geography and Environmental Science Northwest Normal University Lanzhou730070 China
Department of Earth and Space Sciences University of Washington Seattle Washington98195 USA
Department of Geosciences and Engineering Delft University of Technology 2628CN Delft The Netherlands
GFZ German Research Centre for Geosciences Telegrafenberg14473 Potsdam Germany

Asian mineral dust has been studied extensively for its role in affecting regional‐to global‐scale climate and for its deposits, which enable reconstructing Asian atmospheric circulation in the past. However, the timing and origin of the dust deposits remain debated. Numerous loess records have been reported across the Asian continent with ages varying from the Miocene to the Eocene and linked to various mechanisms including global cooling, Tibetan Plateau uplift and retreat of the inland proto‐Paratethys Sea. Here, we study the Eocene terrestrial mudrocks of the Xining Basin in central China and use nonparametric end‐member analysis of grain‐size distributions to identify a loess‐like dust component appearing in the record at 40 Ma. This is coeval with the onset of high‐latitude orbital cycles and a shift to predominant steppe‐desert vegetation as recognized by previous studies in the same record. Furthermore, we derive wind directions from eolian dune deposits which suggest northwesterly winds, similar to the modern‐day winter monsoon which is driven by a high pressure system developing over Siberia. We propose that the observed shifts at 40 Ma reflect the onset of the Siberian High interacting with westerly derived moisture at obliquity timescales and promoting dust storms and aridification in central China. The timing suggests that the onset may have been triggered by increased continentality due to the retreating proto‐Paratethys Sea.

更新日期：2021-03-02

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