PETROCHEMICAL TYPIZATION OF METAPSEFITES-METAPSAMMITES OF THE UKRAINIAN SHIELD AND ITS SIGNIFICANCE FOR LITHOGENETIC RECONSTRUCTIONS AND INTER-REGIONAL STRATIGRAPHIC CORRELATIONS

Abstract

Petrochemical comparison of highly metamorphosed conglomerate-like rocks of the Early Precambrian of the Ukrainian Shield of questionable age and genesis (problem objects) with reference weakly metamorphosed metapsephites-metapsammites of the Paleoproterozoic of the Kryvyi Rih basin provides important additional material for judging the initial nature of highly metamorphosed objects and their probable correlative stratigraphic position. Problem objects on a series of petrochemical diagrams are clearly divided into two separate groups. The first group includes psephitepsammite-like quartzites of the Dibrovsky and Mariupol areas of the Azov Region; petrochemically, they correspond to the Skelevatian reference trend – a highly mature petrochemical type of coarse terrigenous sediments of the lower part of the Paleoproterozoic. The second group unites conglomerate-like gneisses and crystalline schists of the Radomyshl area of the Teterivska Group, of the vicinity of Pervomaisk and the confluence of the Velyka Vys, Hirskyi Tikych, Hnylyi Tikych rivers, metapsefites-metapsammites of the Zvenigorod-Shpolyansk area, as well as Ingul metapsammitous-metaalevritous gneisses. This group is in good agreement with the Gleyevat reference trend, an immature sub-greywacke petrochemical type of sediments of the upper Paleoproterozoic.