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TitreMineralogy of a fertile fluid conduit related to unconformity-type uranium deposits in the Athabasca Basin, Saskatchewan
TéléchargerTéléchargement (publication entière)
AuteurAdlakha, E E; Hattori, K; Zaluski, G; Kotzer, T G; Davis, W J; Potter, E G
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. 74-82, https://doi.org/10.4095/295785
Année2015
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/295785
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
Formatspdf
ProvinceAlberta; Saskatchewan
SNRC64E; 64L; 64M; 74E; 74F; 74G; 74H; 74I; 74J; 74K; 74L; 74M; 74N; 74O; 74P
Lat/Long OENS-112.0000 -102.0000 60.0000 57.0000
Sujetsgîte de type discordance; discordances; gisements d'uranium; uranium; gisements minéraux; gîtes minéralogiques; minéralisation; altération hydrothermale; gisements minéraux hydrothermaux; caractéristiques structurales; failles; fluides de formation; Bassin d'Athabasca ; géologie économique; minéraux radioactifs; minéralogie
Illustrationscross-sections; location maps; tables; photographs; photomicrographs; plots
Consultation
Endroit
 
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)
This report documents the occurrence and chemical variation of hydrothermal alteration minerals along the P2 fault, the structural host for the world-class McArthur River uranium deposit, in order to identify the mineralogical footprint of ore-forming fluids, define exploration criteria for fertile basement structures associated with this deposit type and infer the nature of the fluids. An assemblage of florencite (LREE-rich aluminum phosphate-sulphate; APS) and magnesio- foitite (alkali deficient Mg tourmaline) with sudoite and illite formed in the basement rocks along the P2 fault and is distinct relative to the alteration assemblages that formed in the basement rocks outside the fault. This assemblage occurs along the entire P2 fault, regardless of its proximity to the McArthur River uranium deposit and is interpreted to be the mineralogical footprint of ore-forming fluids. It may be useful when targeting fertile basement faults during exploration. Compositional zoning in APS minerals indicate that earlier fluids were SO4 2--rich and became P and LREErich through interactions with the basement rocks. The chemical composition of florencite and magnesio-foitite indicates that mineralizing fluids contained low Na and were enriched in REE, especially in the ore zone. High d11B values in magnesio-foitite are interpreted as being sourced from B dissolution by fluids from evaporitic rocks. The similar chemistry and occurrence of these minerals along the entire P2 fault, regardless of proximity to ore, indicate that the P2 fault was a conduit for mineralizing fluids and that the precipitation of uranium was selective to the location of the McArthur River deposit.
GEOSCAN ID295785