Abstract
On the basis of U–Pb, Rb–Sr and Sm–Nd isotopic data, it is shown that formation of uranium mineralization in the Paleoproterozoic Salla-Koulajarvinsky belt (Northern Karelia) was a long-lasting mult-stage process that developed over more than 1 Ga: from the Paleoproterozoic to the Paleozoic. The first stage, 1.75 Ga ago, corresponds to the Svekofennian metamorphic event—regional albitization. The process was dated by the Rb–Sr (isochronic age of albitites is 1754 ± 39 Ma) and U–Pb methods (the age of rutile is 1756 ± 8 Ma). At this stage, with a lower temperature limit of 400–450°C, conditions were favorable for the mobilization and migration of uranium, but not for its deposition in minerals. The second stage, 1.62 Ga ago, was a time of alteration of rocks at the regressive stage of the Svekofennian metamorphic event, when carbonate and chlorite rocks formed after albitites. The age of this stage was estimated as 1627 ± 42 Ma according to ThO2, UO2, and PbO contents in uraninite. Probably, the deposition of uraninite took place at this stage at temperature not higher than 300–350°C. The final, third stage, 385 Ma ago, corresponds to the Paleozoic tectonic activation and formation of Caledonian alkaline intrusions. Uranium minerals were probably redeposited at this stage; the U–Pb age of brannerite is 385 ± 2 Ma.
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Original Russian Text © A.A. Kalinin, T.V. Kaulina, L.M. Lyalina, D.V. Elizarov, P.A. Serov, 2015, published in Zapiski Rossiiskogo Mineralogicheskogo Obshchestva, 2015, No. 2, pp. 99–108.
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Kalinin, A.A., Kaulina, T.V., Lyalina, L.M. et al. Stages in the formation of uranium mineralization in the Salla-Koulajarvinskaya zone (Northern Karelia): Geological and isotope geochronological data. Geol. Ore Deposits 58, 594–599 (2016). https://doi.org/10.1134/S1075701516070047
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DOI: https://doi.org/10.1134/S1075701516070047