O.B. Vysotsky1, https://orcid.org/0000-0002-3542-4685
L.M. Stepaniuk1, stepaniuk@nas.gov.ua, https://orcid.org/0000-0001-5591-5169
L.V. Shumlyanskyy1-3, https://orcid.org/0000-0002-6775-4419
O.V. Kovtun1, https://orcid.org/0000-0003-0475-8778
I.M. Kotvitska1, https://orcid.org/0000-0002-2593-3953
1 M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine, 34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
2 Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Kraków, Senacka 1, PL-31002 Kraków, Poland
3 Curtin University, School of Earth and Planetary Sciences, Perth, Australia
https://doi.org/10.15407/gof.2025.46.048
The Kropyvnytskyi (Kirovohrad) complex was separated, as an independent one, from the Kirovohrad-Zhytomyr complex in the 1993 Scheme of the National Geographic Society of Ukraine. The complex includes syenites, quartz syenites; biotite granites and migmatites, amphibole-biotite porphyry-like; two-mica granites and migmatites; banded and shadowy biotite migmatites; aplite-pegmatoid granites, pegmatites, which, in addition to a number of large massifs (Kropyvnytskyi- Bobrynetskyi, Chyhyrynskyi, Voznesenskyi, Dolynskyi, etc.), form small massifs and bodies with indistinct contacts, oriented according to the rocks that contain them. The chemical composition (petrogenic oxides and rare and scattered elements) of granites and plagiogneiss xenoliths of the Kropyvnytskyi massif and granites and plagiogneiss xenoliths exposed by the Lozuvatskyi quarry was determined by ICP-MS, as well as the isotopic composition of strontium (87Sr/86Sr) in accessory apatites. Based on the results of the analysis of the distribution of petrogenic, minor elements and the primary isotopic ratio 87Sr/86Sr in accessory apatites, it was assumed that the granites of the Kropyvnytskyi complex were formed as a result of ultrametamorphism of a contrasting compositional sequence, in the rocks of which there were quite wide variations in the Rb/ Sr ratio. Plagiogneiss, which occur as xenoliths among granites, are relics of rocks of the sequence that were not assimilated by the granite melt during ultrametamorphism.
Keywords: Kropyvnytskyi complex, granites, plagiogneisses, isotopic ratio 87Sr/86Sr, Ukrainian Shield.
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