FORMATION OF THE HOLLOW-RIDGE topography on THE PUR-TAZ INTERFLUVE IN THE LATE PLEISTOCENE and HOLOCENE
O.L. Opokina1,2, E.A. Slagoda1,2, V.I. Ivanov1, A.V. Khomutov1, A.O. Kuznetsova1, M.M. Danko1, E.S. Koroleva3, G.V. Simonova4
1Tyumen Research Centre, Siberian branch of the Russian Academy of Sciences, Earth Cryosphere Institute, Tyumen, Russia
2Tyumen Industrial University, Tyumen, Russia
3Arctic Research Centre of the Yamal-Nenets Autonomous District, Salekhard, Russia
4Institute of Monitoring of Climatic and Ecological Systems, Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
Keywords: cryogenic structure, genesis of sediment, peatlands, radiocarbon dating, relief, neotectonics
Abstract
The structure of the upper part of permafrost and the topographic features in the northeast of Western Siberia were shaped by changes in the natural environment in the Late Pleistocene and Holocene. In 2016-2021, sections of different landforms - ridges and thermokarst-erosional hollows - were studied within the third lacustrine-alluvial plain of the Pur-Taz interfluve. The upper part of the plain includes the Kargin-Sartan alluvial, lacustrine, and slope sediments and Holocene peatlands. Based on the stratigraphy and new geochronological data on the Pur-Taz interfluve, the consequences of the activation of neotectonic processes in the Sartan period and the influence of climatic factors on the differentiation of accumulative and denudation processes in the Holocene were identified.
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