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1 Przegląd Geologiczny

1 2024

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Późnoplejstoceńskie osady niwalne w zachodniej części Polesia (pogranicze polsko-białorusko-ukraińskie)

Marks Leszek, Pochocka-Szwarc Katarzyna, Żarski Marcin, Hrynowiecka Anna, Orłowska Anna

Przegląd Geologiczny

2024

Vol. 72, nr 10

490--500

Geological mapping and examination of several sites in the Polish-Belarusian-Ukrainian border area (including West Polesie in Poland, Brest Polesye in Belarus and Volhyn Polesye in Ukraine) enabled to revise the origin and age of the covering deposits in this area. During the Vistulian Glaciation (Weichselian), the study area was located within a periglacial zone in which intense frost weathering, denudation, dynamics of the permafrost active layer, thawing of snow, and aeolian activity occurred. The periglacial transformation of the landscape was provided by low-energy waterflow and its stagnation, followed by deposition of fines in low-lying areas. Dependent on the prevailing processes, accumulation of nival (niveofluvial, niveolimnic and niveoaeolian) sediments occurred, particularly outside the river valleys. Such deposits were typical especially for the Upper Pleniglacial and Late Glacial of the Vistulian Glaciation. They are common in the study area and are underlain mostly by glaciofluvial deposits of the Odranian (Saalian) and Sanian 2 (Elsterian) glaciations. Strong seasonal winds, scarce vegetation, thin snow cover in winter, and dry climate in the periglacial zone favoured development of aeolian processes, but small contents of fines in nival deposits and weak aeolian treatment of quartz grains reflect a very short-distance transport.