Abstract
Two uraninite generations were recognized both from different chemical composition and chemical and U–Pb isotopic dating in the Zhovta Richka U deposit. Earlier uraninite occurs as disseminated in metasomatically altered iron quartzite. It is rich in Y (0.23–0.32) and Ca (0.67–1.21 wt%) and chemically dated from 1976 +41/–9.1 to 2019 +37/–48 Ma from time-related incorporation of Si (0.04–0.21), Fe (0.01–0.30) and Mn (0.00–0.19 wt%). U–Pb discordia age of 1751.2 ± 2.8 Ma was obtained for later uraninite generation. It occurs as veinlets and disseminated, and was doped by Zr (0.75–2.40), V (0.01–0.43) and Ti (0.00–0.60 wt%) during crystallization, but also contains Ca (1.05–3.20), Si (0.18–0.68), Fe (0.00–0.27) and Mn (0.01–0.48 wt%) which were dominantly incorporated into uraninite along with Pb loss. Diverse ages of uraninite in the deposit are well concordant with two episodes of regional scale granitization which involved the Ukrainian Shield for Paleoproterozoic.
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Emetz, A., Cuney, M., Mercadier, J., Velikanov, Y. (2012). Chemical Composition and Age of Uraninite of the Zhovta Richka Uranium Deposit (Ukraine). In: Broekmans, M. (eds) Proceedings of the 10th International Congress for Applied Mineralogy (ICAM). Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27682-8_20
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DOI: https://doi.org/10.1007/978-3-642-27682-8_20
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