GEOSCAN Search Results: Fastlink


TitleFluid composition, thermal conditions, fluid-structural relationships and graphite alteration of the Phoenix uranium deposit, Athabasca Basin, Saskatchewan
DownloadDownload (whole publication)
AuthorWang, K; Chi, G; Bethune, K M; Card, C
SourceTargeted Geoscience Initiative 4: unconformity-related uranium systems; by Potter, E G (ed.); Wright, D M (ed.); Geological Survey of Canada, Open File 7791, 2015 p. 93-102, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Potter, E G; Wright, D M; (2015). Targeted Geoscience Initiative 4: unconformity-related uranium systems, Geological Survey of Canada, Open File 7791
File formatpdf
Lat/Long WENS-106.0000 -104.0000 58.0000 57.0000
Subjectseconomic geology; radioactive minerals; unconformity-type deposit; unconformities; uranium deposits; uranium; mineral deposits; mineral occurrences; mineralization; formation fluids; thermal alteration; thermal analyses; Athabasca Basin; Phoenix uranium deposit
Illustrationslocation maps; cross-sections; photographs; photomicrographs; plots
ProgramTargeted Geoscience Initiative (TGI-4), Uranium Ore Systems
Released2015 03 02 (08:30)
AbstractThe 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.