Altération Et Minéralisation d'Uranium À Shea Creek (Ouest Athabasca)
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Les gisements d'uranium à Shea Creek sont localisés dans la partie ouest du bassin de l'Athabasca (Canada). Ils sont associés à une discordance entre un socle métamorphique d'âge Archéen à Protérozoïque inférieur et une couverture sédimentaire d'origine fluviatile, d'âge Protérozoïque moyen. Les minéralisations se situent à des profondeurs entre 680 et 1000 m, ce qui en fait à ce jour parmi les plus profondes connues dans le bassin. Elles peuvent ètre présentes à la fois dans la couverture, à la discordance et dans le socle. Les principaux objectifs de cette étude sont d'une part de déterminer des guides sédimentologiques, pétrographiques, minéralogiques et géochimiques pour la prospection des corps minéralisés enracinés dans le socle et d'autre part d'utiliser ces critères pour construire une représentation tridimensionnelle permettant de préciser le modèle génétique de ces minéralisations profondes. Cette étude tend à montrer que la localisation des différentes zones minéralisées dépend non seulement des phénomènes d'altération liés aux circulations hydrothermales contrôlées par la tectonique, mais aussi de la nature du remplissage sédimentaire et de son évolution diagénétique.
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