Mechanism for enhanced eolian dust flux recorded in North Pacific Ocean sediments since 4.0 Ma: Aridity or humidity at dust source areas in the Asian interior?

DOI PDF 被引用文献1件
  • Qiang Zhang
    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029 Beijing, China
  • Qingsong Liu
    Centre for Marine Magnetism (CM2), Department of Ocean Science and Engineering, Southern University of Science and Technology, 518055 Shenzhen, China
  • Andrew P. Roberts
    Research School of Earth Sciences, Australian National University, Canberra, ACT 2601, Australia
  • Juan C. Larrasoaña
    Instituto Geológico y Minero de España (IGME), Unidad del IGME en Zaragoza, C/ Manuel Lasala 44 9°B, 50006 Zaragoza, Spain
  • Xuefa Shi
    Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources (MNR), 266061 Qingdao, China
  • Chunsheng Jin
    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029 Beijing, China

書誌事項

公開日
2019-11-19
DOI
  • 10.1130/g46862.1
公開者
Geological Society of America

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<jats:title>Abstract</jats:title> <jats:p>Eolian material within pelagic North Pacific Ocean (NPO) sediments contains considerable information about paleoclimate evolution in Asian dust source areas. Eolian signals preserved in NPO sediments have been used as indices for enhanced Asian interior aridity. We here report a detailed eolian dust record, with chemical index of alteration (CIA) and Rb/Sr variations, for NPO sediments from Ocean Drilling Program Hole 885A over the past 4.0 m.y. CIA and Rb/Sr co-vary with the dust signal carried by combined eolian hematite and goethite concentrations. Changes in CIA around the intensification of Northern Hemisphere glaciation (iNHG) event at ca. 2.75 Ma indicate that dust production in source areas was associated mostly with physical and chemical weathering before and after the iNHG event, respectively. We here attribute the eolian flux increase into the NPO across the iNHG event mainly to increased availability of wind-erodible sediment in dust source areas derived from snow and glacial meltwater runoff, which resulted from glacial expansion and enhanced snowfall in the mountains surrounding the Tarim region in response to global cooling. Our results provide a deeper understanding of Asian interior environmental changes in response to global paleoclimate changes, where dust source areas became intermittently moister rather than more arid in response to global cooling.</jats:p>

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  • Geology

    Geology 48 (1), 77-81, 2019-11-19

    Geological Society of America

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