ZONATION OF GLACIOMARGINAL ENVIRONMENT INFERRED FROM PLEISTOCENE DEPOSITS OF MYSLIBORZ LAKELAND, NW POLAND
The study area in Mysliborz Lakeland (Western Pomerania), NW Poland, is located in the glaciomarginal zone of the Pomeranian Phase (Weichselian glaciation). Three subenvironments of deposits are exposed in the six analysed pits: glacial ice-contact subenvironment, transitional subenvironment and glaciofluvial subenvironment. The glacial ice-contact subenvironment is dominated by coarse-grained, massive and thick beds derived from debris flows and also horizontally laminated sand and gravel deposited by sheet flows. The transitional subenvironment represents deposits between end moraine and proximal outwash plain (sandur). The transitional subenvironment is dominated by coarse-grained diamicton derived from debris flows, horizontally laminated beds deposited by sheet flows, and additionally cross-stratified sediments from channel flows and massive sand from hyper-concentrated flows. The glaciofluvial subenvironment corresponds with the distal part of the glaciomarginal zone. The processes of sediment deposition in the glaciofluvial subenvironment are derived from shallow sheet flows and channelized flows. Architectural element analysis highlights the change in lithofacies associations from glacial ice-contact, through transitional to glaciofluvial subenvironments. This sedimentological zonation of the glaciomarginal zone may have been developed in other glaciomarginal belts and remains to be recognized.
Document Type: Research Article
Affiliations: Department of Geography, University of Kazimierz Wielki, Bydgoszcz, Poland
Publication date: 2008-09-01