AGE OF URANIUM MINERALIZATION IN ROCKS OF THE PETRIVSK IRON ORE DEPOSIT

Uranium mineralization was found in plagiopegmatite, which cuts rocks of the iron ore stratum of the Petrivskoye deposit. Zircon and monazite are present in accessory amounts. The time of pegmatite intrusion was determined by the TIMS method based on accessory monazite - 2028.5±5.6 million years ago. Uranium mineral, probably masuyite, is represented by small fragments of brownish-yellow, yellow and light yellow color. According to the results of uranium-lead isotope dating of the fragments (1-2 pieces), the mineral crystallized 1994.9±6.7 million years ago, which corresponds to the Kirovohrad stage of the geological development of the Ingul megablock.