Vasylenko S. Geological structure, formation and mineralization conditions of Motrona-Annyvske titanium-zirconium placer deposit (Middle Dnieper River region)

This thesis is devoted to the questions of titanium base expansion in Ukraine. It is studied in detail the geological structure of the Motrona-Annyvske titanium-zirconium placer deposit, which is located at the junction zone of the north-eastern slope of the Ukrainian Shield with Dnieper-Donets Depression. The material compositions, structural, textural characteristics of the ore-hosting strata confined to sand deposits of Novo-Petrovskaja suite (Poltava series) were investigated. The granulometric, mineral composition of sand, also the shape and the surface features of mineral grains for heavy and floating fractions has been elucidated. Taking into account the important statistical parameters - sorting coefficient (So) and the average grain diameter (Md) have been identified four genetic types of sand and make conclusion concerning their marine origin. For the first time a series of digital structural-lithological model based on the method of the digital structural and lithologic modelling adapted for placers of heavy minerals for the perspective Motrona-Annyvske deposit were constructed. A series of derivatives (visualizations) of maps and profiles, reflecting the structural and lithological characteristics, morphology of the ore bodies and ore minerals distribution within the deposit were obtained. Two promising areas for industrial development within the deposit have been selected. The automatical ore reserve calculation by gradations of main ore minerals (ilmenite, rutile, zircon) concentrations have been obtained. The palaeogeomorphological conditions of deposit's formation have been reconstructed. Special scheme with definition of paleovalleys position and ancient coastline have been compiled. The shallow pool conditions of deposit's formation are concluded. It is proved that Motrona-Annyvske placer is an independent deposit, but not part of Samotkanske deposit.