Sedimentary record of a Pleistocene ice-sheet interlobate zone (NE Poland)
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Date
2012-09-12T07:51:05Z
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Wydawnictwo Naukowe UAM
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Abstract
Well developed NE-SW trending corridors of outwash in NE Poland are associated with a series of lakes with a similar
direction of elongation. The glaciofluvial corridor under study consists of parallel ridges with associated channels
and kames. The deposits are flanked by till and hummocky terrain. The gravel ridges are composed of sand and gravel
deposits that are cross-stratified, massive or graded, and that contain cut-and-fill structures and large intra-clasts of
sand and gravel. Locally the deposits show normal faults. The succession of one of the ridges is interpreted to reflect
the infilling of a braided channel in a crevasse. Sedimentation took place in some phases when the ice-sheet regime
changed from active to stagnant. Sandy-gravel ridges occur within this complex perpendicular to the Weichselian icesheet
margin.
The corridor is interpreted as an interlobate area in the zone between the Warmia and Mazury ice lobes. The braided-
channel deposits are not comparable to typical Polish sandurs. The lithofacies characteristics show higher energy
conditions, and the channels are deeper than those typical of Pleistocene lowland sandurs. The sand and gravel ridges
are interpreted as interlobate eskers.
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Keywords
Interlobate sedimentation, Outwash deposits, Esker, Weichselian