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TitreMagmatic Ni-Cu-PGE sulphide deposits at convergent margins
TéléchargerTéléchargement (publication entière)
AuteurNixon, G T; Manor, M J; Jackson-Brown, S; Scoates, J S; Ames, D E
SourceTargeted Geoscience Initiative 4: Canadian nickel-copper-platinum group elements-chromium ore systems -- fertility, pathfinders, new and revised models; par Ames, D E (éd.); Houlé, M G (éd.); Commission géologique du Canada, Dossier public 7856, 2015 p. 17-34, https://doi.org/10.4095/296676
Année2015
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/296676
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Ames, D E; Houlé, M G; (2015). Targeted Geoscience Initiative 4: Canadian nickel-copper-platinum group elements-chromium ore systems -- fertility, pathfinders, new and revised models, Commission géologique du Canada, Dossier public 7856
Formatspdf
ProvinceColombie-Britannique
SNRC92H; 104I
Lat/Long OENS-122.0000 -120.0000 50.0000 49.0000
Lat/Long OENS-130.0000 -128.0000 59.0000 58.0000
Sujetsétablissement de modèles; nickel; platine; chrome; genèse des minerais; métallogénie; minéralisation; sulfures; complexe ultramafique Alaskien; roches ultramafiques; minéraux métalliques; pétrologie ignée et métamorphique; Paléozoïque; Crétacé
ProgrammeÉtude des gîtes magmatiques de Ni-Cu-EPG, Initiative géoscientifique ciblée (IGC-4)
Diffusé2015 06 22
Résumé(disponible en anglais seulement)
Magmatic Ni-Cu-PGE sulphide deposits hosted by ultramafic-mafic intrusions in convergent-margin tectonic settings are an increasingly important resource worldwide, yet remain poorly understood and underexplored. A compilation of global mineralized intrusions in subduction-related settings underscores their economic potential and reveals mineralogical differences that may reflect parental magma composition and ore-forming processes. Our geochemical and isotopic investigations of two mineralized ultramafic intrusions in the Cordillera, the orthopyroxene-absent Turnagain Alaskan-type intrusion and the orthopyroxenerich Giant Mascot intrusion, emphasize (1) the importance of wall-rock assimilation in promoting sulphide saturation and formation of an immiscible sulphide liquid; and (2) the ability of narrow conduit systems to channel influxes of new metal-laden magma and serve as traps for the collection of upgraded Ni-Cu-PGE sulphides. Processes fundamental to the production of economic Ni-sulphide deposits in the oxidized and hydrous primitive magmas generated at subduction zones are similar to those that have produced worldclass magmatic nickel deposits in other tectonic settings.
GEOSCAN ID296676