UDC 550.93
Stepanyuk L.M., Bondarenko S.M, Yvanov B.N., Dovbush T.Y., Kurylo S.Y., Semka V.O., Shestopalova E.E.
Language: Ukrainian
Geochemistry and ore formation 2014, 34: 18-25
https://doi.org/10.15407/gof.2014.34.018
The age of formation of uranium mineralization and host granitoids of beriozovo type have been determined by uranium-lead isotopic method on uraninite and monazite respectively. Berezovo type granites dated at 2038.7±0.7 million years show good correlation with the age of magmatic rocks of Novoukrainska massif. Uraniim mineralization of Vatutinka deposit was formed in several stages. The crystals of the most ancient uraninite have the age of 1752,4±0,6 million years, that is completely correlative with of Korsun-Novomirgorod pluton emplacement. The age values of 1740,2±5,9 million years were obtained for two crystals of uraninite. It is also established, that uranium-lead isotopic system is disturbed in uraninite crystals sampled from weakly oxidised zone. The processes which have led to the isotopic system disturbance of these uraninites, could be manifested not earlier than 1625 million years ago.
Key words: uraninite, monazite, Vatutinka uranium deposit, isotopic date, age, sodic-uranium formation.
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