Morphology of pingo-like features on the shelf of the Pechora and Kara seas as an indicator of their age and dynamics

¹Kokhan A.V., ¹Moroz E.A., ^1,2Eremenko E.A., ^1,2Denisova A.P., ³Ananiev R.A., ¹Sukhikh E.A., ³Nikiforov S.L., ¹Sokolov S.Yu.

MORPHOLOGY OF PINGO-LIKE FEATURES ON THE SHELF OF THE PECHORA AND KARA SEAS AS AN INDICATOR OF THEIR AGE AND DYNAMICS

Relief and Quaternary deposits of the Arctic, Subarctic and North-West Russia. Issue 9.

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doi: 10.24412/2687-1092-2022-9-143-148

1 Geological Institute of RAS, Moscow, Russia

2 Lomonosov Moscow State University, Moscow, Russia

3 Shirshov Institute of Oceanology of RAS, Moscow, Russia

Abstract. Using to the results of multi-beam echo sounding and high-frequency seismic profiling performed during expeditions of RV «Akademik Nikolai Strakhov» and «Akademik Boris Petrov» in 2018-2022, regularities of changes in morphometric parameters and the internal structure of pingо-like features on the shelves of the Pechora and Kara seas were established. A morphometric analysis of pingo-like features was carried out, which made it possible to draw conclusions about their relative age, as well as the degree of participation of the activity of near-bottom currents and slope processes in their modern dynamics. It was revealed that the density and morphological diversity of pingo-like features depend on the geomorphological and geological position within the bottom area, the presence, thickness and type of permafrost, the intensity of degassing, and the time of shelf flooding during the Holocene transgression.

Keywords: Arctic, degassing, fluidogenic landforms, acoustic anomalies, Holocene transgression, permafrost

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Cite this article:

Kokhan A.V., Moroz E.A., Eremenko E.A., Denisova A.P., Ananiev R.A., Sukhikh E.A., Nikiforov S.L., Sokolov S.Yu. 2022. Morphology of pingo-like features on the shelf of the Pechora and Kara seas as an indicator of their age and dynamics // Relief and Quaternary deposits of the Arctic, Subarctic and North-West Russia. Issue 9. P. 143-148. doi: 10.24412/2687-1092-2022-9-143-148