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Late Glacial Lake-Level Changes in the Lake Karakul Basin (a Closed Glacierized-Basin), eastern Pamirs, Tajikistan

Published online by Cambridge University Press:  20 January 2017

Tetsuya Komatsu  and
Sumiko Tsukamoto
Tetsuya Komatsu*
Affiliation:
Faculty of Environmental Earth Science, Hokkaido University, W-5, N-10, Sapporo 060-0810, Japan
Sumiko Tsukamoto
Affiliation:
Leibniz Institute for Applied Geophysics, Stilleweg 2, Hannover 30655, Germany
*
*Corresponding author. E-mail address:[email protected] (T. Komatsu).
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Abstract

The lake-level variations during the Late Glacial in the Lake Karakul basin (a closed glacierized-basin), in the northernmost part of the eastern Pamirs, were reconstructed using geomorphological and sedimentological evidence, with a chronology developed using luminescence ages from sand-sized quartz and K-feldspar in the lake sediments. Lake transgression started before ~ 19 ka, with the peak water level of ~ 35 m above the present elevation occurring at ~ 15 ka. This was synchronous with a significant advance of the glacier in the catchment. Stepwise lake regression, including a rapid lowering of the lake level (~ 13 m at ~ 12 ka), persisted until at least ~ 10 ka. Lake transgression and localized glacier expansion from ~ 19 to ~ 15 ka likely correlate with the more regional Late Glacial glacier advances across the semi-arid western Himalayan–Tibetan orogen and the eastern Pamirs. The longer-term trend of this lake transgression was probably caused by colder and/or wetter climatic conditions, forcing a notable glacier advance.

Keywords

Lake KarakulPamirsPaleolakeGlaciationPaleoshorelineLuminescence dating
Type
Research Article
Information
Quaternary Research , Volume 83 , Issue 1 , January 2015 , pp. 137 - 149
Copyright
University of Washington

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