Abstract
Reconstruction of former Central Asian glaciers extents can provide valuable information about past atmospheric circulation variations. These extents, often marked by terminal moraines, need to be ...
Highlights
Accurate chronological dating of glacial landforms is essential to constrain the timing of Pleistocene glaciations
Glacial chronologies derived from moraines and glacio-fluvial deposits are largely based on cosmogenic nuclide exposure (CNE) and optically stimulated luminescence (OSL) dating methods
Based on two paleoglacial reconstructions conducted in the Altai Mountains in Central Asia, uncertainties related to CNE and OSL dating techniques and their effects on the reliability of glacial chronologies were investigated
Summary
Accurate chronological dating of glacial landforms is essential to constrain the timing of Pleistocene glaciations. Dating of moraines associated with the most extensive mountain style glaciations, in the Tien Shan, Pamir and Kunlun, indicate a formation time during the early Last Glacial or before. These chronologies refute the existence of LGM ice sheets (Xu et al, 2011; Owen and Dortch, 2014). Geomorphological evidence in several valleys indicates larger glacial extents pre-dating the MIS 2 advance At this stage, determining a clear regional glaciation chronology associated with these earlier events remains challenging.
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