The role of neotectonic activations in the formation of the Ukrainian sub-province of titanium and titanium-zirconium placer deposits (scientific and applied aspects)

Анотація

Summary Titanium and titanium-zirconium placer deposits of the USTTZPD were most actively formed in the middle Jurassic - early Cretaceous and the end of the Oligocene-middle Miocene, which is consistent with the initial stages of geomorphological and neotectonic stages. During the neotectonic stage, placers were most actively formed during tectonic activations at the end of the Oligocene - at the beginning of the Miocene, at the beginning of the middle Miocene. The placers were formed in the deposits of the Poltava series at all levels of the paleorelief. The titanium placers of the Irshansky ore field (relatively elevated denudation plain) and the titanium-zirconium Motrjna-Annyvske placer deposit (MAPD) of the Prydniprovske ore field (denudation-accumulative and coastal accumulative plains of the US) were studied. It was found that the dynamics of neotectonic movements during activations significantly influenced the processes of morpholitogenesis and oregenesis of placer deposits of USTTZPD. This is confirmed by quantitative indicators (coefficients) of the material composition of placers. They allowed us to study the vertical and horizontal structure of placers, to establish the rhythmic accumulation of productive strata. On different neotectonic blocks the number of rhythms was 1–6 (rhythms). In the sea basin where MAPD was formed, this caused permanent changes in the conditions of morpholitogenesis and placer oregenesis. The conducted research of USTTZPD allowed to receive important scientific results, allow to improve development of placer deposits taking into account prevention of activation of negative geological processes (erosion, suffusion, formation of depression funnels, etc.).

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