The porphyry-like biotite-garnet granites (sample KВ-5-1) of the Sokolivkа quarry were studied. The quarry is located in the Kirovohrad granite massif on the southwest of Kropyvnytsky city. The aim of our geochronology investigation is to determine the age of granites of the Kirovohrad massif by the U-Pb isotope method using monazite. The age of granites from Kirovohrad massif by the U-Pb method using monazite has not been determined yet. According to our data, the porphyry granites of the Kirovohrad massif (Sokolivkа quarry) were formed 2034 million years ago. This U-Pb data of the porphyry-like granites is significantly lower than the U-Pb age of the granites from other parts of this massif. This may be due to the multistage formation of the Kirovohrad massif, for example, the Novoukrainskiy and some granite massifs of the Zhytomyr complex from Volyn’ megablock.
Strongest directly observed Solar Proton Event of 23-Feb-1956: Revised reference for the cosmogenic-isotope method