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Ice Complex formation on Bol'shoy Lyakhovsky Island (New Siberian Archipelago, East Siberian Arctic) since about 200 ka

Published online by Cambridge University Press:  17 April 2019

Sebastian Wetterich*
Affiliation:
Research Unit Potsdam, Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, 14473 Potsdam, Germany
Natalia Rudaya
Affiliation:
Research Unit Potsdam, Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, 14473 Potsdam, Germany Institute of Geology and Petroleum Technologies, Kazan State University, 420008 Kazan, Russia Centre of Cenozoic Geochronology, Institute of Archaeology and Ethnography, Russian Academy of Sciences, Siberian Branch, 630090 Novosibirsk, Russia
Vladislav Kuznetsov
Affiliation:
Department of Geomorphology, St. Petersburg State University, 199034 St. Petersburg, Russia
Fedor Maksimov
Affiliation:
Department of Geomorphology, St. Petersburg State University, 199034 St. Petersburg, Russia
Thomas Opel
Affiliation:
Research Unit Potsdam, Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, 14473 Potsdam, Germany Permafrost Laboratory, Department of Geography, University of Sussex, Brighton BN1 9QJ, United Kingdom
Hanno Meyer
Affiliation:
Research Unit Potsdam, Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, 14473 Potsdam, Germany
Frank Günther
Affiliation:
Research Unit Potsdam, Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, 14473 Potsdam, Germany Institute of Geosciences, University of Potsdam, 14476 Potsdam, Germany Laboratory Geoecology of the North, Faculty of Geography, Lomonosov Moscow State University, 119991 Moscow, Russia
Anatoly Bobrov
Affiliation:
Department of Soil Geography, Faculty of Soil Science, Moscow State University, 119991 Moscow, Russia
Elena Raschke
Affiliation:
Research Unit Potsdam, Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, 14473 Potsdam, Germany
Heike H. Zimmermann
Affiliation:
Research Unit Potsdam, Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, 14473 Potsdam, Germany
Jens Strauss
Affiliation:
Research Unit Potsdam, Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, 14473 Potsdam, Germany
Anna Starikova
Affiliation:
Department of Geomorphology, St. Petersburg State University, 199034 St. Petersburg, Russia
Margret Fuchs
Affiliation:
Helmholtz Institute Freiberg for Ressource Technology, Helmholtz-Zentrum Dresden-Rossendorf, 09599 Freiberg, Germany
Lutz Schirrmeister
Affiliation:
Research Unit Potsdam, Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, 14473 Potsdam, Germany
*
*Corresponding author e-mail address: [email protected] (S. Wetterich).

Abstract

Late Quaternary landscapes of unglaciated Beringia were largely shaped by ice-wedge polygon tundra. Ice Complex (IC) strata preserve such ancient polygon formations. Here we report on the Yukagir IC from Bol'shoy Lyakhovsky Island in northeastern Siberia and suggest that new radioisotope disequilibria (230Th/U) dates of the Yukagir IC peat confirm its formation during the Marine Oxygen Isotope Stage (MIS) 7a–c interglacial period. The preservation of the ice-rich Yukagir IC proves its resilience to last interglacial and late glacial–Holocene warming. This study compares the Yukagir IC to IC strata of MIS 5, MIS 3, and MIS 2 ages exposed on Bol'shoy Lyakhovsky Island. Besides high intrasedimental ice content and syngenetic ice wedges intersecting silts, sandy silts, the Yukagir IC is characterized by high organic matter (OM) accumulation and low OM decomposition of a distinctive Drepanocladus moss-peat. The Yukagir IC pollen data reveal grass-shrub-moss tundra indicating rather wet summer conditions similar to modern ones. The stable isotope composition of Yukagir IC wedge ice is similar to those of the MIS 5 and MIS 3 ICs pointing to similar atmospheric moisture generation and transport patterns in winter. IC data from glacial and interglacial periods provide insights into permafrost and climate dynamics since about 200 ka.

Type
Research Article
Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2019 

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Footnotes

The data from this study are available at https://www.pangaea.de.

References

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