Depositional environment of a fan delta in a Vistulian proglacial lake (Skaliska Basin, north-eastern Poland)
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Department of Geomorphology, Faculty of Geography and Regional Studies, University of Warsaw, Krakowskie Przedmieście 30, 00-927 Warszawa, Poland
Polish Geological Institute – National Research Institute, Rakowiecka 4, 00-975 Warszawa, Poland
Online publication date: 2013-06-26
Publication date: 2013-06-26
Acta Palaeobotanica 2013; 53(1): 9–21
The study reconstructed the environment of a fan delta fi lling the vast end depression of the Skaliska Basin, and its overlying aeolian deposits. The formation of the large fan delta is associated with the presence of an ice-dammed lake functioning during the retreat of the Vistulian Glaciation (MIS 2). The examined material was collected from fi ve boreholes. Sediments were analysed for their granulometric composition and subjected to analyses of frosting and rounding of quartz grains. Grain size analysis showed that the fan delta deposits are built of sand sediments of very low lateral and vertical variability. The fan delta was supplied with fl uvioglacial sediments. Accumulation of sediments occurred in shallow water with a very low-gradient slope. The exposed fan delta became a site conducive to aeolian processes after the lake waters fell and the Skaliska Basin depression dried. Dune deposits overlying the fan were affected by short-distance transport so they did not acquire features typical for aeolian deposits.