| Titre | Geomathematical study of sandstones overlying the Phoenix Uranium Deposits and the REE-rich Maw Zone, Athabasca Basin, Saskatchewan |
| Télécharger | Téléchargement (publication entière) |
| Auteur | Chen, S; Hattori, K; Grunsky, E C; Liu, Y |
| Source | Targeted 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. 21-31, https://doi.org/10.4095/295780 (Accès ouvert) |
| Année | 2015 |
| Éditeur | Ressources naturelles Canada |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/295780 |
| Media | en ligne; numérique |
| Référence reliée | Cette 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 |
| Formats | pdf |
| Province | Saskatchewan |
| SNRC | 74H |
| Lat/Long OENS | -106.0000 -104.0000 58.0000 57.0000 |
| Sujets | gîte de type discordance; discordances; gisements d'uranium; uranium; gisements minéraux; gîtes minéralogiques; minéralisation; Bassin d'Athabasca ; géologie économique; minéraux radioactifs;
Précambrien |
| Illustrations | location maps; tables; plots; 3-D diagrams; photomicrographs |
| Consultation | |
| Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre) |
| |
| Programme | Étude des gîtes d'uranium, Initiative géoscientifique ciblée (IGC-4) |
| Diffusé | 2015 03 02 (08:30) |
| Résumé | (disponible en anglais seulement)
To evaluate the relationship between the enrichment of REEs and U mineralization, we carried out Principal Component Analysis (PCA) of sandstones above the
Phoenix U deposits and in the REE-rich Maw Zone in the eastern Athabasca Basin. The Phoenix deposits, with indicated resources of 70.2 M lbs U3O8, occur along the unconformity and a steeply dipping fault in the basement at ca. 400 m depth. The Maw
Zone, a breccia pipe with surface exposure of 300 by 200 m, consists of highly silicified, hematitized, dravitic tourmaline-rich rocks with high REE (<8.1 wt. % as total REE oxides). The Maw Zone is ca. 4 km southwest from the south end of Phoenix
deposits and does not contain high U (< 7.8 ppm U) contents. PCA of sandstones above the Phoenix deposits shows that U is associated with Heavy REEs (HREE)+Y, Light REEs (LREE) and Pb, and inversely correlated with Ti, Zr, Al, and Th. The Maw Zone
displays different element groupings as revealed by PCA: U is strongly correlated with V, Cr, Fe, Ni, Cu, Cd, Na, Li and Ba, but very weakly correlated with HREEs+Y, and inversely with LREEs and P. Relative enrichment of HREEs, Y, and P suggests
xenotime is the predominant host of the HREEs. The grouping of LREEs+Sr+Th+P suggests the occurrence of monazite and/or aluminum phosphate-sulphate (APS) minerals. A mineralogical study confirmed xenotime and APS minerals as the major host of HREEs
and LREEs, respectively. These REE-bearing minerals precipitated from hydrothermal fluids during the brecciation of hematitized sandstones. The positive association between U and Fe in the PCA plot from the Maw Zone suggests that U was transported by
oxidized fluids. The absence of U mineralization in the Maw Zone is explained by low U in the oxidizing fluids, or a lack reducing fluids to precipitate U. |
| GEOSCAN ID | 295780 |
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