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Signature géochimique des éléments des terres rares dans les oxydes d'uranium et minéraux associés dans les gisements d'uranium : analyse par ablation laser couplée à l'ICP-MS et étude géochronologique

Abstract : The ore deposits often display complex stages of formation leading to multiphase mineral crystallizations. The study of these minerals needs to use a sensitive and localized analytical method. Laser ablation coupled to ICP-MS is a good tool for in-situ measurements of low element concentrations (<10 ppm) at a small scale in minerals (around 10 ?m diameter). Two major objectives concerning the use of LAICP-MS have been carried out in this thesis. First part is focused on the determination of the best analytical conditions for rare earth element (REE) quantification with LA-ICP-MS in uranium oxides and associated minerals (carbonate, fluorite). This approach has been coupled to isotopic analysis using ionic microprobe. The second part is dedicated to the application of the methodology on 21 uranium ore bodies typical of four different types of deposits. The uranium oxides from unconformity-related uranium deposits (Athabasca Basin) show typical REE signature whatever their age and location. Data on End Grid U mineralization (Thelon basin) suggest similar conditions of formation and ages as in Athbasca unconformity related uranium deposits. High temperature during magmatic uraninite formation induced strong incorporation of REE in their structures. REE signatures of uranium oxides related to vein type deposits suggest a control of the host rocks. Finally, the different REE signatures obtained on uranium oxides from breccia pipe-related deposit show a strong variation in the conditions of formation in these supposed similar deposits
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Philippe Lach. Signature géochimique des éléments des terres rares dans les oxydes d'uranium et minéraux associés dans les gisements d'uranium : analyse par ablation laser couplée à l'ICP-MS et étude géochronologique. Sciences de la Terre. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0259⟩. ⟨tel-01749641⟩

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