Earth’s Cryosphere, 2024, Vol. XXVIII, No. 1, p. 20-30.
CRYOLITHOGENESIS
SEDIMENTOLOGICAL ANALYSIS OF BOTTOM SEDIMENTS OF THE IVASHKINA LAGOON (BYKOVSKY PENINSULA)
O.V. Levochkina1,*, V.E. Tumskoy2,3, O.V. Dudarev3,4
1 Earth Cryosphere Institute, Tyumen Scientific Center, Siberian Branch of the Russian Academy of Sciences, Malygina St. 86, Tyumen, 625026 Russia
2 Melnikov Permafrost Institute, Siberian Branch of the Russian Academy of Sciences, Merzlotnaya St. 36, Yakutsk, 677010 Russia
3 Tomsk State University, pr. Lenina 36, Tomsk, 634050 Russia
4 Il’ichev Pacific Oceanological Institute, Far Eastern Branch of the Russian Academy of Sciences, Baltiiskaya St. 43, Vladivostok, 690041 Russia
*Corresponding author; e-mail: levochckina@yandex.ru
The results of sedimentological analysis of bottom sediments of the Ivashkina Lagoon on the southern coast of Bykovsky Peninsula (southeast of the Laptev Sea) are presented. Core samples from boreholes drilled in the ancient thermokarst depression now occupied by the lagoon have been analyzed. The use of grain-size distribution data and Passega C–Md diagrams makes it possible to refine the genetic interpretation of the sediments obtained from field descriptions. The Holocene lacustrine–lagoon and taberal sediments and the underlying Middle and Late Pleistocene alluvial sediments have been identified, and their grain-size characteristics have been determined. We have further reconstructed the sequence of sedimentation events in the course of transformation of a thermokarst lake into a marine lagoon.
Keywords: thermokarst lagoons, Laptev Sea, lake sediments, lagoon sediments, sedimentological analysis, Passega diagram.
Recommended citation: Levochkina O.V., Tumskoy V.E., Dudarev O.V., 2024. Sedimentological analysis of bottom sediments of the Ivashkina Lagoon (Bykovsky Peninsula). Earth’s Cryosphere XXVIII (1), 20–30.