Geochemistry and ore formation
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Geochronology of Granitoids of the Eastern Part of the Inhul Region (the Ukrainian Shield)
Stepanyuk L.M., Kurylo S.І., Dovbush T.І., Grinchenko O.V., Syomka V.O., Bondarenko S.M., Shumlyanskyy L.V.
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the National Academy of Sciences of Ukraine
Several massifs of biotite uneven-grained, porphyric, pegmatite and aplite-pegmatite granites of the Kirovohrad Complex, and of hypesthene-bearing (charnockites) granites, monzonites and black-quartz granites of the Novoukrainka Complex are distributed within the eastern part of the Inhul region. The ages of granite crystallization were determined by U-Pb isotope method on multigrain fractions of monazite. Granites of the Pavlivka, Verblyuzhka, and Krynytchuvatska massifs were formed within the age interval of 2038-2046 Ma (within the error of measurement). Monazites sampled from aplite-pegmatite granites that widely crop out a long the right bank of the Bokovenka River (northwards of the Novooleksandrivka village) yielded a younger age of 2030.0 ± 0.3 Ma.Granitoids located in other parts of the Inhul region, i. e. Novoukrainka, Voznesensk, Lisohirska and some other smaller granite massifs, were formed during the same time interval.