RADIOCARBON DATING OF PERMAFROST IN BELY ISLAND, THE KARA SEA
E.A. Slagoda1–3, G.V. Simonova4, Ya.V. Tikhonravova1, A.O. Kuznetsova1, K.A. Popov1, P.T. Orekhov1
1Earth Cryosphere Institute, Tyumen Scientific Center SB RAS, 86, Malygina str., Tyumen, 625026, Russia; eslagoda@ikz.ru2Tyumen State University, 6, Volodarskogo str., Tyumen, 625003, Russia
3Industrial University of Tyumen, 38, Volodarskogo str., Tyumen, 625000, Russia
4Institute of Monitoring of Climatic and Ecological Systems, SB RAS, 10/3, Akademichesky ave., Tomsk, 634055, Russia
Twenty radiocarbon ages have been obtained for permafrost sections on Bely Island (Kara Sea) sampled in 2015–2016. The results make basis for sketch maps of Late Pleistocene (Karginian and Sartanian) and Holocene deposits of marine terraces I and II, the laida, and the floodplain of the Rogozin tidal channel. The Karginian shelf sediments make up terrace II and the uneven base of terrace I, and lie below the sea level under the laida; the Sartan shelf and subaerial deposits are widespread on terrace I. The new radiocarbon ages place the first time constraints on the Sartan sediments and record the northward sea retreat within the island at the Karga/Sartan boundary. The laida and the Rogozin Channel floodplain formed during the Atlantic, Subboreal, and Little Ice Age deposition in the Holocene simultaneously with peat deposition in drained lakes (hasyreys) on terraces.
Radiocarbon dating, Karga, Sartan, Holocene, terrace, laida, lithology, flora composition, Bely Island