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TitleHydrothermal alteration in hydro-fractured Athabasca Basin sandstone: distal expression of uranium mineralization?
AuthorPercival, J BORCID logo; Bosman, S A; Potter, E GORCID logo; Ramaekers, P; Venance, K E; Hunt, P A; Davis, WORCID logo; Jefferson, C W
SourceExploration and Mining Geology vol. 21, 2013 p. 63-77
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20130392
PublisherCanadian Institute of Mining, Metallurgy and Petroleum
File formatpdf
AreaMoon Lake; Cigar Lake; Key lake
Lat/Long WENS-106.0000 -104.0000 58.0000 57.0000
Subjectsmineralogy; geochronology; hydrothermal alteration; clays; alteration; illite; kaolinite; quartz; uranium; mineralization; cores; mineral assemblages; zircon dates; Athabasca Basin; Manitou Falls Formation; Athabasca Group
Illustrationsgeological sketch maps; photomicrographs
ProgramGEM: Geo-mapping for Energy and Minerals Uranium
Released2013 01 01
AbstractA 10-cm thick clay-rich layer near the top of the Manitou Falls Formation of the Athabasca Group is unusual in its breccia texture, alteration, and detrital mineral composition relative to the adjacent overlying and underlying sedimentary beds. This layer is composed of angular quartz grains set in an illite >> kaolinite + dickite matrix. Deformed clay-rich fragments within the layer have very similar mineral assemblages.
the presence of euhedral accessory minerals including Ti-oxides and aluminophosphatesulphate minerals points to a diagenetic/hydrothermal origin. The presence of individual grains of K-feldspar and amphibole is unusual relative to the typical Athabasca quartz arenite; originally, these minerals were probably included in detrital quartz and subsequently liberated during fracturing. The textures and alteration characteristics suggest that this layer is a hydraulically-fractured unit, which has experienced hydrothermal fluid alteration -- a possible pathway distally related to uranium mineralization.

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