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Genèse des minéralisations uranifères hudsoniennes (1,7 - 1,8 Ga) dans les socles de la Laurentia et de la Baltica

Abstract : Paleoproterozoic is a key transitory period for Uranium deposits. The appearance of an atmosphere with free oxygen (GOE, ca. 2,4 Ga), event generally know as oxyatmoversion, made it possible U mobility via aqueous solutions. The present thesis deals with two types of uranium mineralizations that are related to this period (Cage district, Québec). The first "stratoïd" deposit is characterized by U, Ba, V, Mo, Pb, Zn, mineralizations without Th. Host-rocks are carbonate paleoproterozoic series, from Lake Harbour Group, that were metamorphosed during the Torgnat orogen (1,87-1,77 Ga). The percolation along the carbonate platforms of an oxidized meteoric fluid lead to Uranium deposits by interaction with U enrichment from volcanic material, and organic rich MVT type mineralization. The second U-Th mineralization is hosted by "skarn s.l.". It is related to pegmatites and hydro-magmatic fluids with the same deep origin: granutilization of archean terranes on which Lake Harbour Group is situated. The present work permits a better comprehension of U enrichment of paleoproterozoic crust with two new hypotheses: - Ore concentrations related to the carbonate platforms, enriched in sulfate, during rifting and dislocation of mega-continents at the end of Archean times; - Ore concentrations related to UHT metamorphism and granutilization of continental crust during hypercollision and formation of the so-called Nuna continent.
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Jérémy Neto. Genèse des minéralisations uranifères hudsoniennes (1,7 - 1,8 Ga) dans les socles de la Laurentia et de la Baltica. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2010. Français. ⟨NNT : 2010NAN10021⟩. ⟨tel-01748563⟩



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