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Abstract
Epigenetic uranium mineralization occurs in several iron ores in Central Sweden. Uranium-lead age determinations always give discordant age data due to a chemical alteration of the primary uranium minerals (uraninites). The main chemical process acted continuously over long periods of time in a reducing environment and dissolved the radiogenic lead which was partly redeposited as galena. Less important are alterations of the uraninites to thucholite and secondary uranium minerals. As a result of the interpretation of the discordant age data two periods of uranium mineralization of different paragenetic types have been established at 1585 and 1785 m.y.