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The late Pleistocene glaciation in the Bogchigir Valleys (Pamir, Tajikistan) based on 10Be surface exposure dating

Published online by Cambridge University Press:  25 September 2012

Ines Röhringer ,
Roland Zech ,
Uwe Abramowski ,
Pjotr Sosin ,
Ala Aldahan ,
Peter W. Kubik ,
Ludwig Zöller  and
Wolfgang Zech
Ines Röhringer
Affiliation:
University of Bayreuth, Bayreuth, Germany
Roland Zech*
Affiliation:
Geological Institute, ETH Zurich, Zurich, Switzerland
Uwe Abramowski
Affiliation:
University of Bayreuth, Bayreuth, Germany
Pjotr Sosin
Affiliation:
Tajik Academy of Agriculture, Dushanbe, Tajikistan
Ala Aldahan
Affiliation:
Department of Earth Sciences, Uppsala University, Uppsala, Sweden
Peter W. Kubik
Affiliation:
Laboratory of Ion Beam Physics, ETH Zurich, Zurich, Switzerland
Ludwig Zöller
Affiliation:
University of Bayreuth, Bayreuth, Germany
Wolfgang Zech
Affiliation:
University of Bayreuth, Bayreuth, Germany
*
⁎Corresponding author. Email Address:[email protected]
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Abstract

Glacial chronologies from the Pamir may not only provide insights into past changes in temperature, but also into past changes in precipitation related to the northern-hemispheric westerlies and the monsoonal circulation. We present 18 new exposure ages from the Bogchigir Valleys that complement and refine our previous studies in these valleys. The most extensive dated glaciation in the area occurred ~ 100 ka, during Marine Oxygen Isotope Stage (MIS) 5, and indicates increased precipitation likely from both the westerlies and the monsoonal circulation. A subsequent glacier advance, which deposited characteristic ‘chukur’ moraine lobes, occurred at ~ 80–75 ka. Circumstantial evidence points to glacial advances at ~ 65 and 40 ka, the latter likely also documenting increased monsoonal moisture supply during MIS 3. Less extensive glacial advances occurred during MIS 2 at ~ 28 and 24 ka and reflect the aridization trend during the course of the last glacial cycle. Deglaciation started ~ 21 ka, interrupted by minor stillstands or readvances at ~ 16 and 12 ka. Local calibration sites and glacier-climate modeling would be very helpful to reduce the systematic methodological uncertainties (still at least 10%) and to draw more detailed paleoclimatic conclusions.

Keywords

QuaternaryCosmogenic nuclidesPaleoclimateWesterliesMonsoon
Type
Articles
Information
Quaternary Research , Volume 78 , Issue 3 , November 2012 , pp. 590 - 597
Copyright
University of Washington

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