O.V. Kovtun, https//orcid.org/0000-0003-0475-8778
L.M. Stepanyuk, https://orcid.org/0000-0001-5591-5169
O.V. Ziultsle, https://orcid.org/0000-0002-6204-2009
O.B. Vysotsky, https//orcid.org/0000-0002-3542-4685
T.I. Dovbush, https://orcid.org/0000-0002-3512-3313
G.G. Pavlov, https//orcid.org/0000-0002-5913-042X
N.O. Kovalenko, https://orcid.org/0000-0002-3203-7145
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine 34, Acad. Palladina Ave., Kyiv, Ukraine, 03142
https://doi.org/10.15407/gof.2024.45.064
The Ingul megablock of the Ukrainian Shield covers the territory located between the Golovaniv structure zone and the Yadlovo-Trachtemyriv fault zone — in the west and the Ingulets-Kryvorizka structure interblock zone — in the east. This megablock contains the Ingulets series, which includes the Zelenorichanska and Artemivska series. The Artemivsk serie is represented here by an association of ferruginous pyroxene- and amphibole-magnetite quartzites and various metasedimentary rocks interlayered with them (garnet-biotite and biotite gneisses, pyroxene-plagioclase crystal schists, quartzites, cumingtonite and amphibole-diopside schists, as well as leptite-like gneisses). Southeast of the village Petrovo (Kirovohrad Region) on the left bank of the River Ingulets is the Petrivsk iron ore deposit, there an iron ore stratum was mapped in the iron ore stratum of the Petrovsk deposit, which corresponds to the Artemivsk suite of the Ingulets series by the nature of the section. Uranium mineralization was identified in a plagiopegmatite that intrudes the iron ore layers of the Petrivske deposit. Zircon and monazite are present in accessory quantities. The age of the pegmatite intrusion was determined by the TIMS method, based on accessory monazite, to be 2028.5 ± 5.6 million years ago. The uranium mineral, likely masyuite, appears as small fragments with brownish-yellow, yellow, and light yellow colors. Uranium-lead isotope dating of the fragments (1-3 pieces) shows that the mineral crystallized 1994.9 ± 6.7 million years ago, which aligns with the Kirovohrad stage of the geological development of the Ingul megablock.
Key words: uranium-lead isotope age, monazite, deposit, Artemivsk suite, megablock.
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