TY - JOUR

T1 - Позднеледниковая и раннеголоценовая история озерного осадконакопления на севере Молого-Шекснинской низменности на примере озера Белого (Северо-Запад России)

AU - Садоков, Дмитрий Олегович

AU - Сапелко, Татьяна Валентиновна

AU - Бобров, Никита Юрьевич

AU - Melles, Martin

AU - Федоров, Григорий Борисович

N1 - Funding Information: 1 Darwin State Nature Biosphere Reserve, 44, d. Borok, 162723, Russian Federation 2 St Petersburg State University, 7–9, Universitetskaya nab., St Petersburg, 199034, Russian Federation 3 Institute of Limnology of the Russian Academy of Sciences, SPC RAS, 9, ul. Sevastyanova, St Petersburg, 196105, Russian Federation * The research was funded by the Russian Foundation for Basic Research, project number 19-35-90026. Laboratory work was funded by the joint academic grant program “Dmitrii Mendeleev” of St Petersburg University and DAAD (German Academic Exchange Service). Fieldwork was supported by the research topics of Darwin Nature Biosphere Reserve (“Palaeogeography of the Mologa-Sheksna Lowland”, 2018) and Institute of Limnology RAS (Topic No. 0154-2019-0001). Publisher Copyright: © 2022 St. Petersburg University Press. All rights reserved.

PY - 2022

Y1 - 2022

N2 - Few detailed case studies have been devoted so far to the Late Pleistocene palaeogeography of the northern Mologa-Sheksna Lowland (MSL), compared to adjacent regions covering the Valdai glaciation marginal zone. Lake Beloye (Russia, Vologda region, Babaevo district) bottom sediments were studied using ground penetrating radar (GPR) and subsequently were cored in order to build a palaeoclimatic reconstruction for the northern MSL, because lacustrine deposits are considered to be valuable and representative palaeoarchive of the area. Chronology of regional palaeoclimatic and palaeohydrological changes from the Bølling — Allerød warming to the Early Holocene was traced on the basis of inorganic and organic geochemistry, mineralogical proxies, grain-size, magnetic susceptibility, accelerator mass spectrometry radiocarbon dating and optical microanalysis. During the Late Glacial and the Pleistocene/Holocene transition in the northern MSL interstadial climatic conditions were determined at ~ 14.0 cal. ka BP (Bølling, stage GI-1e of the GICC05 timescale) and ~ 13.0 cal. ka BP (Allerød, stages GI-1c3 — GI-1a). A pronounced cold period associated with Younger Dryas (stage GS- 1) was registered in the multiproxy record at 12.8–11.7 cal. ka BP. High-resolution x-ray fluorescence (XRF) core scanning helped to reveal short-term “cold” events at ~ 13.7, ~ 13.1 and ~11.5 cal. ka BP, which were associated with Older Dryas (stage GI-1d), Gerzensee-Killarney oscillation (stage GI-1b) and Preboreal oscillation respectively, and “warm” episodes at ~ 13.2 and ~ 11.8 cal. ka BP, which presumably correspond to the end of the stage GI-1c1 and Greenlandian Stage/Age respectively. Ultimate interglacial (Holocene) climate onset within the MSL was attributed to ~ 11,7 cal. ka BP, which is marked by the sharp rise of total organic carbon content in the sediments and lithological changes to muddy fraction. Numerous water level oscillations occurred in the large proglacial lakeduring the last glacial termination, ending with Its final drainage in the northern MSL by ~ 10.9 cal. ka BP. The reconstructed palaeoclimatic dynamics is in overall agreements with the global reconstructions for the North Atlantic and Fennoscandia regions.

AB - Few detailed case studies have been devoted so far to the Late Pleistocene palaeogeography of the northern Mologa-Sheksna Lowland (MSL), compared to adjacent regions covering the Valdai glaciation marginal zone. Lake Beloye (Russia, Vologda region, Babaevo district) bottom sediments were studied using ground penetrating radar (GPR) and subsequently were cored in order to build a palaeoclimatic reconstruction for the northern MSL, because lacustrine deposits are considered to be valuable and representative palaeoarchive of the area. Chronology of regional palaeoclimatic and palaeohydrological changes from the Bølling — Allerød warming to the Early Holocene was traced on the basis of inorganic and organic geochemistry, mineralogical proxies, grain-size, magnetic susceptibility, accelerator mass spectrometry radiocarbon dating and optical microanalysis. During the Late Glacial and the Pleistocene/Holocene transition in the northern MSL interstadial climatic conditions were determined at ~ 14.0 cal. ka BP (Bølling, stage GI-1e of the GICC05 timescale) and ~ 13.0 cal. ka BP (Allerød, stages GI-1c3 — GI-1a). A pronounced cold period associated with Younger Dryas (stage GS- 1) was registered in the multiproxy record at 12.8–11.7 cal. ka BP. High-resolution x-ray fluorescence (XRF) core scanning helped to reveal short-term “cold” events at ~ 13.7, ~ 13.1 and ~11.5 cal. ka BP, which were associated with Older Dryas (stage GI-1d), Gerzensee-Killarney oscillation (stage GI-1b) and Preboreal oscillation respectively, and “warm” episodes at ~ 13.2 and ~ 11.8 cal. ka BP, which presumably correspond to the end of the stage GI-1c1 and Greenlandian Stage/Age respectively. Ultimate interglacial (Holocene) climate onset within the MSL was attributed to ~ 11,7 cal. ka BP, which is marked by the sharp rise of total organic carbon content in the sediments and lithological changes to muddy fraction. Numerous water level oscillations occurred in the large proglacial lakeduring the last glacial termination, ending with Its final drainage in the northern MSL by ~ 10.9 cal. ka BP. The reconstructed palaeoclimatic dynamics is in overall agreements with the global reconstructions for the North Atlantic and Fennoscandia regions.

KW - Holocene

KW - Late Glacial

KW - X-ray fluorescence

KW - climatostratigraphy

KW - lacustrine sedimentation

UR - https://www.mendeley.com/catalogue/106ecaf5-f820-3938-b2ec-5f5c644d03b7/

UR - http://www.scopus.com/inward/record.url?scp=85141825756&partnerID=8YFLogxK

U2 - 10.21638/spbu07.2022.204

DO - 10.21638/spbu07.2022.204

M3 - статья

VL - 67

SP - 266

EP - 298

JO - Вестник Санкт-Петербургского университета. Науки о Земле

JF - Вестник Санкт-Петербургского университета. Науки о Земле

SN - 1812-9323

IS - 2

ER -