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  • Study of the migration of uranium, thorium and rare earth elements within an intragranitic uranium vein : Analogy with a high level radioactive waste repository in a granitic formation


The dispersion of uranium, thorium and rare earth elements from a U-vein type deposit (localised in an intragranitic vein) through the surrounding host rock has been characterised by combining petrological, mineralogical and geochemical studies. The different stages of hydrothermal alteration, including those leading to changes in the major or trace element concentrations, have been identified. The distances over which the uranium, thorium and the rare earth elements have migrated are estimated and correlated to the main water/rock interaction processes. The role of co-precipitation with secondary minerals in the retention of these elements is stressed. These processes are considered to be analogous to those which could take place around a radioactive waste repository in a similar rock formation. The main geochemical implications of this work for the safety assessment of such a disposal are discussed.

Additional information

Authors: MENAGER M-T, CEA, Direction du Cycle du Combustible, Laboratoire d'Etude des Comportements à Long Terme, Fontenay-aux-Roses (FR)
Bibliographic Reference: EUR 13529 FR (1991) 34 pp., FS, ECU 5
Availability: (2)
ISBN: ISBN 92-826-2646-6
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