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Late Plio-Pleistocene humidity fluctuations in the western Qaidam Basin (NE Tibetan Plateau) revealed by an integrated magnetic–palynological record from lacustrine sediments

Published online by Cambridge University Press:  20 January 2017

Christian Herb ,
Andreas Koutsodendris ,
Weilin Zhang ,
Erwin Appel ,
Xiaomin Fang ,
Silke Voigt  and
Jörg Pross
Christian Herb
Affiliation:
Department of Geosciences, University of Tübingen, Hölderlinstr. 12, 72074 Tübingen, Germany
Andreas Koutsodendris
Affiliation:
Paleoenvironmental Dynamics Group, Institute of Earth Sciences, University of Heidelberg, Im Neuenheimer Feld 234, 69120 Heidelberg, Germany
Weilin Zhang
Affiliation:
Department of Geosciences, University of Tübingen, Hölderlinstr. 12, 72074 Tübingen, Germany Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Building 3, Courtyard 16, Lin Cui Road, Beijing 100101, China
Erwin Appel*
Affiliation:
Department of Geosciences, University of Tübingen, Hölderlinstr. 12, 72074 Tübingen, Germany
Xiaomin Fang
Affiliation:
Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Building 3, Courtyard 16, Lin Cui Road, Beijing 100101, China
Silke Voigt
Affiliation:
Institute of Geosciences, University of Frankfurt, Altenhöferallee 1, 60438 Frankfurt, Germany
Jörg Pross
Affiliation:
Paleoenvironmental Dynamics Group, Institute of Earth Sciences, University of Heidelberg, Im Neuenheimer Feld 234, 69120 Heidelberg, Germany
*
*Corresponding author.Email Address:[email protected]
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Abstract

Deciphering the climatic evolution of the Tibetan Plateau region during the Plio-Pleistocene is hampered by the lack of continuous archives and proxy datasets indicative of moisture availability. Here we assess the suitability of magnetic susceptibility (χ) measured on lacustrine sediments as a paleohydrological proxy based on material from drill core SG-1 (2.69–0.08 Ma) from the western Qaidam Basin. Our assessment is based on directly comparing χ with the Artemisia/Chenopodiaceae (A/C) pollen ratio, which represents a sensitive, well-established proxy for moisture changes in arid environments. We find that higher and lower χ values represent drier and less dry conditions, respectively, for the Late Plio-Pleistocene. Less dry phases were likely caused by transiently increased influence of the westerlies and/or decreased influence of the Asian winter monsoon on glacial–interglacial time scales. An exception from this relationship is the interval between ~ 1.9 and 1.3 Ma, when the SG-1 χ record exhibits a 54 ka cyclicity, which may indicate summer monsoon influence on the Qaidam Basin during that time. After ~ 1.3 Ma, the summer monsoon influence may have ceased due to global cooling, with the consequence that the Asian winter monsoon and the westerlies exerted a stronger control on the hydrology of the Qaidam Basin.

Keywords

Magnetic proxiesPollenLacustrine sedimentsPaleoclimateMonsoonWesterliesQaidam BasinTibetan Plateau
Type
Articles
Information
Quaternary Research , Volume 84 , Issue 3 , November 2015 , pp. 457 - 466
Copyright
University of Washington

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