|Project ID:||MAD Ukrajina–Slovensko|
|Principal investigator:||Igor Broska|
|Investigators from institution:||Igor Petrík, Tomáš Mikuš, Stanislav Jeleň, Juraj Šurka|
Ponomarenko O.M., Bondarenko S., Grinchenko O., Skakun L., young scientists: Kurylo S. and Gavriliv L.
Ukrainian Shield as a unique Precambrian structures situated within European continent include two Proterozoic terraines (megablocks) – Volyn and Ingul megablocks. These megablocks mostly comprize granites formed in different geodynamic settings with wide range of ages and associated ore occurrence and deposits. Ingul megablock (IM) is treated to bee an orogenic region formed as the result of collision between Middle Dnieper granite-greenstone terrain situated on the West and Volyn microcontinent on the East. The merger of both plate and the formation of one-pies collision seam had occurred on the brink of AR3-PR1. The central part of Ingul megablock is treated as fragment of transregional shear zone (Kherson – Smolensk) all structures of which are formed during the the development of this zone. At about 2,1-2,0 billion years, granites of Kirovograd and Novoukrainka types were formed in collision setting. Kirovograd granites are distributed in Central-Wester part of Ingul megablock within regional scale structure known as Ingul sinclinorium. These granites are formed after supracrustal rocks of Ingul-Ingulets series and as a result of prograde ultra metamorphism, occurred in aweakened zone under the drop of pressure. Kirovograd granites are represented by porphyric, equigranular, aplito-pegmatoide, aplite and pegmatite varieties. Geochemical (trace ellement) patterns obtained for these granites indicate that these granites might be related to S-type. Uranium deposit associated with this type of granites can be classified into two genetic types: 1) deposits of potassic-uranium genetic type found in granitic pegmatites similar to that of Rössing type. Among economic ore occurences are Th-REE-U mineralization of Balka Korabelna deposit and three small Th-U deposits (Southern, Kalinovka, Lozovatka) which have been discovered in the south-western part of the Kirovograd continental block; 2) deposits of sodic-uranium genetic type (Novokonstantynivka, Michurinka, Central, Vatutinka, Severynka, Dokuchaevka, Aprelskoe) o are associated with sodic metasomatites (albitites) which are developed after different types of rocks – (gneisses and schists of the Ingul-Ingulets series and pegmatitic granites patially (and genetically?) associated with two-feldspar granites of the Novoukrainka and Kirovograd complexes. Deposits of Li and ore occurrences of Ta, Cs, Rb, Nb, Be, Sn (LCT-type pegmatites) (Polohivka deposit and Stankuvatka ore occurrence) are associated with Li-pegmatites and metasomatites that are considered to be formed at apical part of aplite-pegmatites and granite massifs of Kirovograd type. Volyn (terraine) megablock is the region of tectonic-magmatic activisation which is interpreted to be formedas result of collision between Fennoscandia and Sarmatian segment of West-Europian craton. Intrusive granitoids of Osnytsk types form rock series as a part of Osnytsk-Mikashevychi Vulcano-plutonic association. The Osnytsk-Mikashevychi belt (being the part of large scale Volyn belt) is extending to the North-East of the Central Russian volcanic belt up to the Timan region. This structure border Fennoscandia from Volga-Uralia and Sarmatia along which tectonic movement and magmatic activisation occurred in these crustal blocks. According to isotopic data availiable the granites are thought to be formed from primary melt of mantlle origin. The final stage of major orogenic events occurred within Volyn megablock were manifesyed by the intrusion of Korosten pluton in anorogenic setting. The intrusion was preceded by unstable subplatform regime in the peripheral part of the Osnytsk orogenic belt. It formation was finished at 1,8-1,74 billion years ago. Korosten pluton is complex polyphase intrusive of anorthosite-rapakivi-granite formation (ARGF). The intrusion of Korosten type is the oldest among widely known world occurrence of ARGF. In addition, it is the largest pluton ARGF of West-European craton as well as among all plutons found in Ukrainian Shield. About 75% of total area of Korosten pluton is comprized by rapakivi and rapakivi-like granites. Other 25 % is covered by the basic and hybrid type rocks. According to geochemical features these granites should be related to granites of A-type. This project is aimed at intensification of the scientific cooperation between scientists of the Geological institution of Slovakia Academy of Sciences and National academy of Sciences of Ukraine. Sharing the scientific experience can help to solve a scientific fundamental problem and to find general features of distribution mineralization and economic ore occurrences/deposits both within territories of Slovakia and Ukraine