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TitreFluid composition, thermal conditions, fluid-structural relationships and graphite alteration of the Phoenix uranium deposit, Athabasca Basin, Saskatchewan
TéléchargerTéléchargement (publication entière)
AuteurWang, K; Chi, G; Bethune, K M; Card, C
SourceTargeted Geoscience Initiative 4: unconformity-related uranium systems; par Potter, E G (éd.); Wright, D M (éd.); Commission géologique du Canada, Dossier public 7791, 2015 p. 93-102, (Accès ouvert)
ÉditeurRessources naturelles Canada
Documentdossier public
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Potter, E G; Wright, D M; (2015). Targeted Geoscience Initiative 4: unconformity-related uranium systems, Commission géologique du Canada, Dossier public 7791
Lat/Long OENS-106.0000 -104.0000 58.0000 57.0000
Sujetsgîte de type discordance; discordances; gisements d'uranium; uranium; gisements minéraux; gîtes minéralogiques; minéralisation; fluides de formation; altération thermique; analyses thermiques; Bassin d'Athabasca ; géologie économique; minéraux radioactifs
Illustrationslocation maps; cross-sections; photographs; photomicrographs; plots
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
ProgrammeÉtude des gîtes d'uranium, Initiative géoscientifique ciblée (IGC-4)
Diffusé2015 03 02 (08:30)
Résumé(disponible en anglais seulement)
The Phoenix deposit is a high-grade unconformity-related uranium deposit located in the southeastern Athabasca Basin. Previous studies have revealed similar features to other well-known unconformity-related uranium deposits in the region, but the composition and thermal conditions of the mineralization fluids, the hydrodynamic relationship between structures and fluid pressure, and the nature of graphite degradation near mineralization zones remain unclear. Field (drill core) investigations, petrographic studies of altered and mineralized host rocks, and microthermometric and microstructural studies of fluid inclusions indicate that different structural regimes and fluid systems were developed in the pre-Athabasca stage versus the syn- to post-Athabasca, uranium mineralization stage. The pre-Athabasca stage was characterized by ductile deformation and circulation of metamorphic fluids in a relatively high P-T environment, whereas the syn- to post-Athabasca mineralization stage was characterized by brittle deformation and circulation of basinal brines in a relatively low P-T environment (with fluid inclusion homogenization temperatures of 80 to 135 °C), in which the fluid may have experienced boiling, as indicated by the coexistence of vapour-only and biphase aqueous inclusions. Preliminary fluid inclusion plane (FIP) orientation studies reveal the dominance of subvertical microfractures in crosscutting quartz veins in the basement, possibly indicating an extensional regime during certain periods of time in the synto post-Athabasca mineralization stage. Preliminary petrographic and Raman spectroscopic studies of graphite suggest that the crystal structure of the graphite tends to be more disordered toward the mineralized zones, which may potentially be used as an indicator of mineralization.