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TitreIsotopic fingerprinting of base metal indicator minerals to decipher their provenances: an example from northwest Alberta
AuteurPaulen, R C; Plouffe, A; Smith, I R; Paradis, S
SourceGeohydro 2011, proceedings of the joint meeting of the CANQUA and International Association of Hydrogeologists; 2011 p. 1-7
LiensOnline - En ligne (Full program/Programme complet, PDF 150 MB)
Année2011
Séries alt.Secteur des sciences de la Terre, Contribution externe 20100467
RéunionGeohydro 2011, Joint meeting of the CANQUA and International Association of Hydrogeologists; Quebec City; CA; août 28-31, 2011
Documentlivre
Lang.anglais
Medianumérique; en ligne
Formatspdf
ProvinceAlberta
SNRC84L; 84M
Lat/Long OENS-120.0000 -118.0000 60.0000 58.0000
Sujetsisotopes; rapports des isotopes de plomb; géochimie isotopique; rapports des isotopes de soufre; sphalérite; galène; dépôts glaciaires; tills; directions des mouvements de la glace; directions du transport de la glace; minéralisation; zinc; plomb; métaux de base; gisements de métaux de base; exploration de dépôts glaciaires; géochimie des dépôts glaciaires; géologie des dépôts meubles/géomorphologie; minéraux métalliques; géologie économique; géochimie; Cénozoïque; Quaternaire
Illustrationslocation maps; photomicrographs; plots
ProgrammeBases de données couvrant les trois territoires (minéraux indicateurs), GEM : La géocartographie de l'énergie et des minéraux
ProgrammeBases de données couvrant les trois territoires (minéraux indicateurs), GEM : La géocartographie de l'énergie et des minéraux
Résumé(disponible en anglais seulement)
A dispersal train, containing elevated concentrations of sphalerite and minor galena grains within the sand-sized fraction of till, was discovered as part of a regional glacial sediment sampling survey completed in northwest Alberta. High concentrations of dark grey to black, angular, brittle grains of sphalerite were found (100 to >1000 grains per 30 kg) in bulk till samples. Smaller amounts of galena were found in the same region in eight samples (1 to 9 grains per 30 kg). The background sphalerite and galena content in the till of that region is estimated to be zero grains. The bedrock source of sphalerite and galena in till remains to be identified.
The presence of high sphalerite grain counts in nine samples situated within a geographically restricted area argues against long-distance glacial transport, comminution, and deposition of erratic material from the carbonate-hosted Pine Point Zn-Pb deposits, located 330 km to the northeast. The Pb isotopic composition of the galena grains recovered from till is similar to values obtained from Mississippi Valley-type deposits in the northern Canadian Cordillera and Pine Point suggesting that the galena is derived from similar basement sources situated along the Great Slave Lake Shear Zone. However, sphalerite grains from the till have a sulphur isotopic composition much different from values recorded from Mississippi Valley-type deposits in the northern and southern Cordillera. These results highlight the prospect of base metal deposits hosted within the Cretaceous shale bedrock of northern Alberta.
GEOSCAN ID288017