MICROMORPHOLOGICAL AND MORPHOSCOPIC PARAMETERS OF SAND GRAINS AS INTERPRETATION INDICATION OF THE GENESIS OF KINBURNSKA ARENA

The Кіnburnska arena is one of the seven sand massifs of the Oleshkivsky Sands (Oleshia). In order to clarify the genesis of the relief forms of the Kinburngska аrena and in general the formation of the territory of the Oleshkivsky Sands, a map-scheme of the types of relief forms of the Kinburnska arena is presented for the first time. Another goal of this research was to find out the priority of fluvial or аeolian processes in the formation of arena landforms. In this regard, for the first time, micromorphological and morphoscopic studies of sand grains from deposits of hilly landforms were conducted here. The typology of landforms showed the geomorphological diversity of the arena and evidenced the manifestation of specific, here and there unique landforms. Unique for the territory of Europe here are discrete parallel ridges of the south of the arena, which are a manifestation of giant ripples (diluvial dunes). The author examines their formation in the context of the diluvial paradigm, in particular in relation to fluvioglacial processes at the end of the Pleistocene and flood-overflow processes in the Holocene. The specific formations of the arena here include ridges and depressions formed as a result of the flow of water masses from the water area of the Dniprovsko-Buzkyi liman to the Black Sea (western part of the arena), as well as its Yagorlytskyi Bay (eastern part of the arena). The analysis of the parameters of sand grains from the deposits of various geocomplexes of the Kinburnska arena showed the predominance of weakly rolled grains, as well as the dominance of bugor and bugor-stepped texture of the surface sand grains with almost universal development of micro- and nanoforms on their surface. The typology of the relief forms of the arena and the interpretation of the parameters of the analyzed sand grains proved the dominant role of fluvial processes in the formation of the relief of sandy deposits of the Kinburnska arena and the subordinate importance of aeolian processes.