Age of glacial and fluviogla- cial deposits of the Chibitsky glaciocomplex and its dammed lake (Gorny Altai)

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The areal stratotype of the Chibit glaciation is characterized in the stratigraphic scheme of the Quaternary deposits of the Altai-Sayan mountainous region, corresponding to the last glacial maximum, i.e. the fourth stage of the Upper Neopleistocene of the Russian stratigraphic chart. The reference geological sections of the diamictons of the Chibit horizon are described. A Paleogeographic map showing the area of the Chibitsky and Maasheysky glaciers during the LGM is presented. The map was compiled on the basis of remote sensing materials, field geomorphological observations and field geological data. The boundaries of the glacialdammed Baratal Lake are shown based on flooding level of 1700 m. This level corresponds to the upper terraces on the northeastern edge of the Kurai depression. The boulder-gravel deposites formed as a result of the Baratal lake breakthrough were identified in the old valley of the Chuya River. They compose the 5–7 m high terrace, that is cut into the Chibit moraine. It has been established that the Chibit moraine is embedded into the Saldzhar superflood sequence. Therefore, the Saldzhar and Baratal outbursts are of different ages and scales.

作者简介

I. Zolnikov

Sobolev Institute of Geology and Mineralogy SB RAS; Novosibirsk State University; Institute of Geography RAS

编辑信件的主要联系方式.
Email: novikov@igm.nsc.ru
俄罗斯联邦, Novosibirsk; Novosibirsk; Moscow

E. Deev

Novosibirsk State University; Trofimuk Institute of Petroleum Geology and Geophysics SB RAS; Institute of Geography RAS

Email: novikov@igm.nsc.ru
俄罗斯联邦, Novosibirsk; Novosibirsk; Moscow

R. Kurbanov

Institute of Geography RAS; Lomonosov Moscow State University, Faculty of Geography

Email: novikov@igm.nsc.ru
俄罗斯联邦, Moscow; Moscow

A. Panin

Institute of Geography RAS

Email: novikov@igm.nsc.ru
俄罗斯联邦, Moscow

I. Novikov

Sobolev Institute of Geology and Mineralogy SB RAS

Email: novikov@igm.nsc.ru
俄罗斯联邦, Novosibirsk

A. Vasiliev

Sobolev Institute of Geology and Mineralogy SB RAS; Novosibirsk State University

Email: novikov@igm.nsc.ru
俄罗斯联邦, Novosibirsk; Novosibirsk

参考

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2. Fig. 1 . A Paleogegeographic map of the basin of the middle Chuya and the proposed scheme for the distribution of the Chibit glaciation. 1 – observation points (numbers in rectangles – numbers of points); 2 – settlements; 3 – channel of the outburst of the Baratal lake in the old Chuya valley; 4 – main rivers; 5 – Baratal ice-dammed lake; 6 – areas of distribution of glaciers of the LGM time according to remote sensing and field observations.

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3. Fig. 2 . Columns of reference Quaternary sections. 1 – aleuropelite; 2 – aleurite; 3 – sand; 4 – gravel; 5 – pebbles; 6 – boulders; 7 – gruss; 8 – diamicton; 9 – blocks; 10 – paleosoil; 11 – bedding; 12 – luminescence and radiocarbon dates (Panin and Baryshnikov, 2015a,b; Agatova et al., 2020; Zolnikov et al., 2021).

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4. Fig. 3 . A series of terraces of the Baratal Lake in the northeast of the Kurai basin.

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