River response to climate and sea level changes during the Late Saalian/Early Eemian in northern Poland – a case study of meandering river deposits in the Chłapowo cliff section
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Date
2016-04
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Publisher
Instytut Geologii UAM
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Abstract
Fluvial sediments in the Chłapowo cliff section were studied in order to reconstruct their palaeoflow conditions and
stratigraphical position. Lithofacies, textural and palaeohydraulic analyses as well as luminescence dating were performed
so as to achieve the aim of study. Sedimentary successions were identified as a record of point bar cycles. The
fluvial environment probably functioned during the latest Saalian, shortly after the retreat of the Scandinavian Ice
Sheet. Discharge outflow was directed to the northwest. The river used the older fluvioglacial valley and probably
was directly connected to the Eem Sea. Good preservation and strong aggradation of point-bar cycles were related to
a rapid relative base level rise. The meandering river sediments recognised showed responses to climate and sea level
changes as illustrated by stratigraphical, morphological and sedimentological features of the strata described. The
present study also revealed several insights into proper interpretation of meandering fluvial successions, in which the
most important were: specific lithofacies assemblage of GSt (St, Sp) → Sl → SFrc → Fm (SFr) and related architectural
elements: channel/sandy bedforms CH/SB → lateral accretion deposits LA → floodplain fines with crevasse splays FF
(CS); upward-fining grain size and decreasing content of denser heavy minerals; estimated low-energy flow regime
with a mean depth of 1.6–3.3 m, a Froude number of 0.2–0.4 and a sinuosity of 1.5.
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Keywords
point-bar succession, meandering fluvial system, Quaternary geology, fluvial sedimentology, Eemian Sea
Citation
Geologos, 2016, 22, 1, pp.1-14.
ISBN
ISBN 978-83-232187-4-6