Timing and extent of glaciation since the Last Glacial Maximum in the upper Kalguty basin, Russian Altai Mountains - Université Savoie Mont Blanc Access content directly
Journal Articles Journal of Quaternary Science Year : 2023

Timing and extent of glaciation since the Last Glacial Maximum in the upper Kalguty basin, Russian Altai Mountains

Abstract

ABSTRACT The mountains systems of Central Asia are primary targets to study late Pleistocene climate evolution given their location at the crossroads of several atmospheric circulation systems. The timing of glacier extent during this period remains understudied, especially in the Altai Mountains. Here, we have reconstructed glacier extent during three main Late Pleistocene stadials in the upper Kalguty basin (south‐eastern Russian Altai) based on field‐based geomorphic analysis. Additionally, surface exposure dating with 10 Be and 26 Al at a key site was used to infer a minimum‐limiting age for the outermost well‐preserved Pleistocene frontal moraine system and to date the inception of glacier withdrawal. According to our data, around 20.6 ± 1.8 ka Kalguty Glacier was still 200 m thick at the key site, 10 km upstream of the outermost moraine, and the site was totally deglaciated shortly after 20.4 ± 0.4 ka. These results point to a rapid retreat of this low‐gradient valley glacier after its probably MIS 2 maximum which was prior to 21 ka and probably prior to 22.5 ka. Two other glacier stages have been identified upvalley, characterized by a depression of the equilibrium‐line altitude of 420 and 314 m with respect to the Little Ice Age, thus corresponding to Lateglacial advances. Our glacier reconstruction further provides a geomorphological and geochronological background to put into context archaeological findings in this area.
Embargoed file
Embargoed file
0 9 2
Year Month Jours
Avant la publication
Thursday, November 28, 2024
Embargoed file
Thursday, November 28, 2024
Please log in to request access to the document

Dates and versions

hal-04287315 , version 1 (28-11-2023)

Identifiers

Cite

Philip Deline, Ludovic Ravanel, Jean‐jacques Delannoy, Melaine Le Roy, Team Aster, et al.. Timing and extent of glaciation since the Last Glacial Maximum in the upper Kalguty basin, Russian Altai Mountains. Journal of Quaternary Science, 2023, 38 (7), pp.1082-1102. ⟨10.1002/jqs.3535⟩. ⟨hal-04287315⟩
23 View
1 Download

Altmetric

Share

Gmail Facebook X LinkedIn More