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TitreTill composition near Cu-porphyry deposits in British Columbia: highlights for mineral exploration
TéléchargerTéléchargement (publication entière)
AuteurPlouffe, A; Ferbey, T
SourceTGI 4 - Intrusion Related Mineralisation Project: new vectors to buried porphyry-style mineralisation; par Rogers, N (éd.); Commission géologique du Canada, Dossier public 7843, 2015 p. 15-37, https://doi.org/10.4095/296464
Année2015
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/296464
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Rogers, N; (2015). TGI 4 - Intrusion Related Mineralisation Project: new vectors to buried porphyry-style mineralisation, Commission géologique du Canada, Dossier public 7843
Formatspdf
ProvinceColombie-Britannique
SNRC92I; 92P; 93A; 93B
Lat/Long OENS-124.0000 -120.0000 53.0000 50.0000
Sujetsgisements porphyriques; cuivre porphyrique; prospection minière; dépôts glaciaires; tills; analyses de till; géochimie du till; exploration de dépôts glaciaires; dépôts glaciaires; écoulement glaciaire; directions des mouvements de la glace; profils de dispersion; minéralisation; éléments d'indice; tungstène; molybdène; étain; bismuth; molybdenite; cuivre; or; Mine Gibraltar ; géologie économique; géologie des dépôts meubles/géomorphologie; Mésozoïque; Jurassique; Trias
Illustrationslocation maps; photomicrographs; flow charts; cross-sections
Consultation
Endroit
 
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
 
ProgrammeÉtude des gîtes porphyriques, Initiative géoscientifique ciblée (IGC-4)
LiensCanadian Database of Geochemical Surveys, downloadable files
LiensBanque de données de levés géochimiques du Canada, fichiers téléchargeables
Diffusé2015 06 11
Résumé(disponible en anglais seulement)
Till orientation surveys were completed in the region of four Cu porphyry deposits in British Columbia with the objective of defining geochemical and mineralogical indicators of porphyry mineralisation buried by glacial sediments. We demonstrate that even if those deposits contain low to medium metal grades (e.g., 0.2 to 0.4 % Cu compared to an average crustal abundance of 0.0075 % Cu), they are reflected in the till composition with elevated concentrations of ore metals (Cu, Au, Mo) and pathfinder elements (Hg, Pb, Zn, Ag), and large grain counts of ore minerals (chalcopyrite, gold grains) and alteration minerals (e.g., epidote, andradite garnet, apatite) which are in contrast with surrounding regions devoid of mineralisation. These zones with elevated metal or mineral content in till define glacial dispersal trains that extend several kilometres down-ice from the bedrock mineralised sources. In this study, the shape of the dispersal trains is principally controlled by: 1) the ice-flow directions; and 2) the areal extent of the mineralisation exposed to glacial erosion which can comprise a cluster of sub-economic mineralised zones in the periphery of the main economic deposits. Using those porphyry indicators and existing till composition data sets from a region underlain by Late Triassic to Early Jurassic intrusions within the Quesnel terrane, we postulate that potential for Cu-Au porphyry style mineralisation exists within the Spout Lake pluton to the west of the Takomkane batholith and at the northern end of the Thuya batholith.
GEOSCAN ID296464