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TitreConvergent margin Ni-Cu-PGE-Cr ore systems: temporal and magmatic evolution
TéléchargerTéléchargement (publication entière)
AuteurNixon, G T; Milidragovic, D; Scoates, J S
SourceTargeted Geoscience Initiative 5, Grant Program interim reports 2018-2019; par Benn, D; Brenan, J M; Fuller, K; Grondahl, C; Layton-Matthews, D; Leybourne, M I; Linnen, R; Martins, T; Milidragovic, D; Moynihan, D P; Mungall, J E; Nixon, G T; Padget, C D W; Pattison, D R M; Rempel, K U; Scanlan, E J; Scoates, J S; Tsay, A; Voinot, A; Van Wagoner, N A; Weston, R; Williams-Jones, A E; Woods, K; Zajacz, Z; Commission géologique du Canada, Dossier public 8620, 2019 p. 49-61, https://doi.org/10.4095/315001 (Accès ouvert)
Année2019
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/315001
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Benn, D; Brenan, J M; Fuller, K; Grondahl, C; Layton-Matthews, D; Leybourne, M I; Linnen, R; Martins, T; Milidragovic, D; Moynihan, D P; Mungall, J E; Nixon, G T; Padget, C D W; Pattison, D R M; Rempel, K U; Scanlan, E J; Scoates, J S; Tsay, A; Voinot, A; Van Wagoner, N A; Weston, R; Williams-Jones, A E; Woods, K; Zajacz, Z; (2019). Targeted Geoscience Initiative 5, Grant Program interim reports 2018-2019, Commission géologique du Canada, Dossier public 8620
Formatspdf (Adobe® Reader®)
ProvinceColombie-Britannique
SNRC82E; 82F; 82K; 82L; 82M; 82N; 83D; 83E; 92; 93; 94; 103; 104; 114
Lat/Long OENS-142.0000 -116.0000 60.0000 49.0000
Sujetsgisements minéraux; gîtes sulfureux; nickel; cuivre; chrome; cobalt; prospection minière; directives d'exploration; genèse des minerais; minéralisation; établissement de modèles; évolution tectonique; cadre tectonique; marges plaques; magmatisme; intrusions; mise en place; accretion; terrains; marges continentales; datation radiométrique; datation au uranium-plomb; datation argon-argon; palladium; fer; géologie du substratum rocheux; lithologie; caractéristiques structurales; failles; Cordillère canadienne; Terrane de Quesnellia ; Terrane de Yukon-Tanana; Terrane de Methow ; Terrane de Cache Creek ; Terrane de Cassiar ; Plate-Forme de Cassiar ; Assemblage de Lay Range ; Groupe d'Ingenika ; éléments du groupe de platine; géologie économique; géochronologie; tectonique; Sciences et technologie; Phanérozoïque; Mésozoïque; Crétacé; Jurassique; Trias; Paléozoïque; Permien; Carbonifère; Dévonien; Silurien; Ordovicien; Cambrien; Précambrien; Protérozoïque
Illustrationsgeoscientific sketch maps; photomicrographs
ProgrammeGestion de la connaissance de IGC, Initiative géoscientifique ciblée (IGC-5)
Diffusé2019 08 29
Résumé(disponible en anglais seulement)
Ultramafic-mafic intrusions at convergent margins contain some of the world's significant Ni-Cu-PGE sulphide deposits and are becoming an increasingly important exploration target. This class of intrusions is well-represented in the accreted arc terranes of the northern Cordillera, particularly the Alaskan-type subclass. In this report, we describe current research on three Alaskan-type intrusions in British Columbia that are variably endowed in magmatic Ni-Cu-PGE mineralization. The goal of this project is to determine the timing of mineralization in relation to the temporal and magmatic evolution of the intrusion and to develop new mineral deposit models as guides for exploration. U-Pb and 40Ar/39Ar geochronological results for the Turnagain intrusion indicate multi-stage assembly of a composite body in the Early Jurassic (ca. 189-185 Ma) during initial accretion of arc terranes to the ancient North American continental margin. Ni(-Co) and Cu-PGE sulphide mineralization is partitioned within separate sub-intrusions that were emplaced during active accretion. A newly investigated zone of Cu-Pd-Pt sulphide mineralization in the Tulameen intrusion bears a strong resemblance to certain 'reef-style' deposits in layered intrusions. Preliminary geochronology results indicate emplacement of the Tulameen intrusive suite in the latest Triassic (ca. 204-206 Ma), coincident with the most prolific Cu-Au porphyry epoch in British Columbia. Investigation of magmatic sulphide occurrences at the Polaris Alaskan-type intrusion was initiated last summer and samples collected during the field season are currently being processed and examined.
GEOSCAN ID315001