L.V. Shumlyanskyy1—3, lshumlyanskyy@yahoo.com, https://orcid.org/0000-0002-6775-4419
L.M. Stepanyuk2, stepaniuk@nas.gov.ua, https://orcid.org/0000-0001-5591-5169
T.B.Yaskevych2, https://orcid.org/0000-00003-0969-5497
1 Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Kraków,
Senacka 1, PL-31002 Kraków, Poland
2 M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine,
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
3 Curtin University, School of Earth and Planetary Sciences, Perth, Australia
https://doi.org/10.15407/gof.2025.46.026
The Ostriv open pit, situated on the right bank of the Ros River east of city of Bila Tserkva, reveals a rock association typical for the Ros-Tikych region of the Ukrainian Shield. It comprises uniform-grained or porphyritic granites, which contain small bodies of granodiorites, plagiogranites, and amphibolites. The LA-ICP-MS and SIMS methods were used to determine the zircon age of crystalline rocks exposed in the open pit. All granitoids exhibited the same age within an error (2080-2050 Ma), suggesting they formed during a single phase of igneous activity. The age of metamorphic zircon in amphibolite, 2080 ± 11 Ma, also aligns with this stage of activity. Some zircon crystals in granitoids contained ancient (Mesoarchean) inherited cores; their proportion is notably higher in zircons from two-feldspar granites. The Hf isotopic composition determined in zircons from amphibolite and granodiorite reveals the long crustal prehistory of their protoliths.
Keywords: U-Pb isotope dating, zircon, granitoids, amphibolite, Ros-Tikych region.
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