Caractéristiques minéralogiques et géochimiques du bassin sédimentaire mésoprotérozoique de Pasha - Ladoga et de son socle (Bouclier Balte, Russie). Implications pour la génèse des gisements d'uranium de type discordance

Abstract : The mineralogy and the geochemistry of the Mesoproterozoic (Riphean) Pasha-Ladoga volcanic - sedimentary intracontinental clastic basin (Russian Karelia), associated uranium mineralization and underlying basement lithologies have been characterized and compared with those of highly mineralized districts having similar age and lithologic associations. The clastic sediments appear much more immature than highly mineralized basins of the Athabasca (Canada) and Kombolgie (Northern Australia). However, large-scale fluid circulation has been evidenced in the Archean to Paleoproterozoic metamorphic rocks and Mesoproterozoic rapakivi granites of the basement and in the overlying clastic sediments of the Pasha - Ladoga area, where the Karku unconformity related uranium deposit has been discovered. These fluid circulations are related to zircon alteration and to a lesser degree to monazite at the regional scale and essentially with a Fe-chlorite and carbonate alteration assemblage produced in the mineralized districts.
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Vladimir Lobaev. Caractéristiques minéralogiques et géochimiques du bassin sédimentaire mésoprotérozoique de Pasha - Ladoga et de son socle (Bouclier Balte, Russie). Implications pour la génèse des gisements d'uranium de type discordance. Autre. Université Henri Poincaré - Nancy 1, 2005. Français. ⟨NNT : 2005NAN10005⟩. ⟨tel-01748090⟩

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