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Article Dans Une Revue Quaternary Science Reviews Année : 2012

History of late Pleistocene glaciations in the central Sayan-Tuva Upland (southern Siberia)

Résumé

This work describes the history of late Pleistocene glaciations in the central Sayan-Tuva Upland (southern Siberia). Geological and geomorphological analysis as well as 10Be surface-exposure dating revealed the glacier fluctuations in this continental area. The available published data show that the glaciers were formed in the MIS 6 and probably survived in the MIS 5. Data are also available concerning glacial advances in different periods of MIS 4, MIS 3 and MIS 2. ELAs were 2030-2230 m. Two distinct 10Be exposure ages groups are highlighted reflecting the time of formation of glacial deposits in the MIS 2 associated to the Big Sayan Ridge outlet glaciers. The Sentsa - Sailag group (terminal moraine) has a mean exposure age of 16.44 ± 0.38 ka. The Jombolok (terminal moraine) - Jombolok (outwash plain) group has a mean exposure age of 22.80 ± 0.56 ka. The last glaciation that occurred at MIS 2 is characterized by the absence of ice cap on the Azas volcanic Plateau and of ice field in the Todza Basin. The thickness of the valley glacier was 300-400 m. At MIS 2, the terminal moraines were ∼1300-1400 m a.s.l. in the Tissa, Sentsa, Jombolok and Sailag river valleys.
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hal-00758082 , version 1 (08-05-2022)

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Paternité - Pas d'utilisation commerciale

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Sergei G Arzhannikov, Regis Braucher, Marc Jolivet, Anastasia V. Arzhannikova, Riccardo Vassallo, et al.. History of late Pleistocene glaciations in the central Sayan-Tuva Upland (southern Siberia). Quaternary Science Reviews, 2012, 49, pp.16-32. ⟨10.1016/j.quascirev.2012.06.005⟩. ⟨hal-00758082⟩
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