Controversial issues of geomorphology and paleogeography of the Upper Yenisei valley
https://doi.org/10.31857/S0435428120030104
Abstract
Workshop on the development of a regional stratigraphic scheme of Quaternary deposits of the Altai-Sayan region passed in Novosibirsk on 22 and 23 November 2018. In its decisions it was noted that it is necessary to change previously adopted glacial and alluvial terrace stratigraphy of the Quaternary as not corresponding to the actual material. According to the new stratigraphic schemes, the Altai-Sayan mountain region experienced all glaciation in the Pleistocene, and each climate cycle corresponds to a single erosion-accumulative cycle. In accordance with the decisions of the workshop, the revision of Quaternary sections was held in Tuva and Khakassia on 18–31 May, 2019. It was established that the first and the second Late Pleistocene alluvial terraces are enclosed into polyfacial catafluvial unit, which individual facies were mistakenly interpreted as moraine in previous schemes. The name “Ulugbekskyˮ was proposed for this unit. Similar units in the Altai mountains and For-Altai Plains are catafluvial deposits dated to about 90 kyr BP. They were formed during the outburst of the Kurai-Chuya lake system. The formation of the Ulugbeksky deposits were associated with the outburst of the Darkhad Palaeolake that occurred 92–80 ka BP. This allows to correlate the Ulugbeksky unit in the Yenisei valley with the Saljarsky unit in the Altai mountains.
Keywords
Quaternary paleogeography,
glacial and alluvial stratigraphy,
catafluvial sediments,
Ulugbeksky and Saljarsky units
Supporting agencies: The authors express gratitude to the employees of the Siberian PGO N.N. Popova for their help in organizing the field meeting, V.M. Kolyamkin, T.A. Shatalina for their active participation in the field meeting. The work was carried out on the state mission of TuvIENR SB RAS (project No. АААА-А17- 117072710021-1), with the support of Russian Foundation of Basic Researches (project №. 20-05-00605 A).
About the Authors
A. V. Shpansky
Tomsk State University
Russian Federation
Tomsk
Russian Federation
Tomsk
M. V. Mikharevich
Siberian Research Institute of Geology, Geophysics and Mineral Resources
Russian Federation
Novosibirsk
Russian Federation
Novosibirsk
I. S. Novikov
Institute of Geology and Mineralogy SB RAS
Russian Federation
Novosibirsk
Russian Federation
Novosibirsk
I. D. Zolnikov
Institute of Geology and Mineralogy SB RAS; Novosibirsk State University
Russian Federation
Novosibirsk
Russian Federation
Novosibirsk
S. G. Prudnikov
Tyva Institute of Complex Exploration of Natural Resources SB RAS
Russian Federation
Kyzyl
Russian Federation
Kyzyl
O. I. Kalnaya
Tyva Institute of Complex Exploration of Natural Resources SB RAS
Russian Federation
Kyzyl
Russian Federation
Kyzyl
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Review
For citations:
Shpansky A.V., Mikharevich M.V., Novikov I.S., Zolnikov I.D., Prudnikov S.G., Kalnaya O.I. Controversial issues of geomorphology and paleogeography of the Upper Yenisei valley. Geomorfologiya. 2020;(3):98-105. (In Russ.) https://doi.org/10.31857/S0435428120030104
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