Taras NOVAK, Maria FEDOROVYCH

MORPHOLOGY AND GENESIS OF THE POSTCRIOGENIC POLYGONAL MICRORELIEF OF THE VOLYN UPLAND.

This study investigates the form, morphometric parameters, spatial arrangement and origin of postcriogenic polygonal landforms of the Volyn Upland. It was found that the average sizes of the polygons are 30–55 m, the amplitude of heights between polygons and interpolygon depressions usually less than 1 m. Polygonal microrelief usually well-defined on the high quality satellite images (< 1 m/pixel), which allowed the identification of areas of its distribution in the Volyn Upland. In order to verify the cryogenic hypothesis of the Volyn Upland polygonal landform genesis, we calculated the maximum allowable size of polygons depending on vertical size of late pleistocene paleosol pseudomorphoses. The obtained data (107 m) is well correlated with real polygon size. We also have analyzed the degree of influence of aeolian, erosion, karst and loess subsidence processes on the formation of polygonal microrelief. Results suggest a minor or secondary role of these processes in the development of polygonal micro-landforms. The existence of polygonal features in Volyn Upland is caused by activity of periglacial processes during the Krasyliv paleocryogenic stage. Permafrost degradation, accompanied by following fluvial erosion, contributed to partial aggradation and fossilization of paleocryogenic microrelief.

Key words: polygonal microrelief, periglacial patterned ground, Krasyliv paleocryogenic stage, Volyn Upland.

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