Konoval N. Petrology of granitoids of the Kirovohrad and Novoukrainka complexes (Central part of the Ukrainian shield)

In the thesis the results of investigations of granitoids of Kirovograd and Novoukrainka complexes located in Ingulsk megablock in the central part of the Ukrainian shield are given. These granites are different of their depth of formation and complex belonging. Kirovograd granites belong to apopelitic rocks (the criteria of I. B. Scherbakov) and Novoukrainka represent intrusive charnokitoids that associate with gabbroids and monzonites. Such massifs as Mytrofanivska, Kirovograd, Chygyryn are heterogeneous and consist of granites of Kirovograd complex (amphibolitic and high amphibolitic facies) and of granites of Novoukrainka complex (granulitic facies). It is revealed that essential part of the Kirovograd granites are allochthonous. In large grains of plagioclase antyperthitic orthoclase inclusions occur. Essential part of biotites are characteresed by high titanium content (до 3,9% TiO2). According to the results of our investigations, it was first shown, that in Novoukrainka granites the evolution trend of enrichment in iron is cleary displayed. It is similar to ones in many differentiated intrusions as well as in anorthosite-rapakivi granite plutons. According to the reaction principle in the rich in iron field of Fe2SiO4-Mg2SiO4-SiO2 system orthopyroxene does not crystallises and instead it fayalite formes. It is seen in natural gabbro-monzonite-granite association (Korosten and Korsun-Novomyrgorod plutons). Thus in granitic systems extremelly enriched in iron fayalite but not orthopyroxene crystallizes (or magnesity of the last is not higher than 10-15%). It means this orthopyroxene can be only of eulisite composition as it is observed in some charnockites of Novoukrainka or Khlibodarivka (Azov area) massifs. It is revealed that Kirovohrad and Novoukrainka granites have a clear metallogenic specialization primarily on lithium. Micas of these granites and properly these granites are characterized by inereased lithium content. And they can be parent rocks from which deposits of lithium pegmatites (Nadiya, Polohivka, Stankuvate) had been formed.