URANIUM-LEAD GEOCHRONOLOGY BASED ON MONAZITE FROM GRANITES OF THE TSYBULIVA MASSIF (INGUL MEGABLOCK OF THE UKRAINIAN SHIELD)
DOI:
https://doi.org/10.15407/dopovidi2026.03.003Keywords:
uranium-lead isotope system, monazite, granite, Tsybulivskyi massif, Ingul megablockAbstract
The Tsybulivskyi massif is located in the northern part of the Yelizavetgrad gneiss-granite-migmatite dome. The massif consists mainly of biotite and garnet-biotite uniform-grained granites belonging to the Kropyvnytskyi complex. The granites of the massif are exposed by the Tsybulivskyi quarry, located on the left bank of the Inhulets River, northwest of the village of Tsybuleve. These granites belong to the leucocratic rock group and exhibit a massive texture, with banding in some areas, resulting from the uneven and linear distribution of quartz, biotite, and, in places, garnet. The presence of heterogeneous nuclei of relict pre-granitic zircon in the middle of zircon crystals, as well as in the middle of zircon crystals from granites of the Kropyvnytsky and Novoukrainsky massifs, indicates that the granites of the Tsybulivsky massif we studied were formed from volcanogenic-sedimentary rocks, most likely the Chechelievskaya suite of the Ingul-Ingulsky series, among which they are located and whose xenoliths are frequently found in the granites of the massif. The age of the granites was determined by the classical uranium-lead isotope method (TIMS) based on monazite. According to the results of uranium-lead isotope dating of multigrained samples of monazite crystals, the granites of the Tsybulivsky massif formed 2,024.6 ± 6 Ma ago and belong to the age interval (2020—2045 Ma) of the formation of granites of the Kropyvnytsky (Kirovohrad) and Novoukrainsky complexes of the Ingul megablock.
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