Evolution of fluvial system during the Pleistocene warm stage (Marine Isotope Stage 7):a case study from the Błądzikowo Formation, N Poland

Robert Jan Sokołowski , Łukasz Jankowski , Anna Hryniewiecka , Anatoly Molodkov

Abstract

This paper discusses successive changes in the evolution of the fluvial system observed throughout the Błądzikowo Formation at the Mrzezino key site in northern Poland. The study focuses on the development of fluvial sedimentation during Marine Isotope Stage 7. The sedimentary record of the Pleistocene at the study site shows a well-developed sequence that is over 30 m thick. The Błądzikowo Formation shows a quick evolution of the fluvial system from a high-energy sandy braided river, to a meanderingsandy river and, finally, to a low-energy meandering/anastomosing river with significant suspensionsettling. This transition is explained as a decrease in flow energy, increase in aggradation ratio and expansion of accommodation space during deposition time. A change in the fluvial system has not been manifested in the variations of the plant cover. Palynological analysis indicates that climate conditions were generally stable, cool and humid (boreal). Sediment transport occurred towards the N-NW, througha valley with a NW-SE axis. Infrared optically stimulated luminescence (IR-OSL) dating shows the sequence formed from 225.6 ± 17.2 to 210.5 ± 16.6 ka. Well preserved fluvial cycles and 35 m of thickness suggest the intensive accumulation of the Bła˛dzikowo Formation with decreasing ratio of lateral erosion.It suggests an increasing influence of base level rise on evolution of fluvial system, mostly during MIS 7.
Publication typeIn press (online first, early view)
Author Robert Jan Sokołowski ZGM
Robert Jan Sokołowski,,
- Division of Marine Geology
, Łukasz Jankowski ZGM
Łukasz Jankowski,,
- Division of Marine Geology
, Anna Hryniewiecka
Anna Hryniewiecka,,
-
, Anatoly Molodkov
Anatoly Molodkov,,
-
Journal seriesQuaternary International: The Journal of the International Union for Quaternary Research, ISSN 1040-6182
Issue year2017
Noonline first
Pages1-11
Publication size in sheets0.5
Keywords in Englishmeandering river system, sea-level rise, Baltic Sea transgression, IR-OSL dating, penultimate interglacial
DOIDOI:10.1016/j.quaint.2017.09.042
URL https://doi.org/10.1016/j.quaint.2017.09.042
Languageen angielski
Score (nominal)30
ScoreMinisterial score = 30.0, 19-04-2018, ArticleFromJournal
Ministerial score (2013-2016) = 30.0, 19-04-2018, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 2.199 (2) - 2016=2.47 (5)
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