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TitreOverview of VMS exploration in glaciated terrain using indicator minerals, till geochemistry, and boulder tracing: a Canadian perspective
TéléchargerTéléchargement (publication entière)
AuteurMcClenaghan, M B; Peter, J M; Layton-Matthews, D
SourceTargeted Geoscience Initiative 4: Contributions to the understanding of volcanogenic massive sulphide deposit genesis and exploration methods development; par Peter, J M (éd.); Mercier-Langevin, P (éd.); Commission géologique du Canada, Dossier public 7853, 2015 p. 81-99, https://doi.org/10.4095/296546
LiensCanadian Database of Geochemical Surveys, downloadable files
LiensBanque de données de levés géochimiques du Canada, fichiers téléchargeables
Année2015
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/296546
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Peter, J M; Mercier-Langevin, P; (2015). Targeted Geoscience Initiative 4: Contributions to the understanding of volcanogenic massive sulphide deposit genesis and exploration methods development, Commission géologique du Canada, Dossier public 7853
Formatspdf
ProvinceNunavut; Territoires du Nord-Ouest; Nouveau-Brunswick; Manitoba; Québec; Terre-Neuve-et-Labrador
SNRC75I; 75J; 75K; 75L; 75M; 75N; 75O; 75P; 76; 85I; 85J; 85O; 85P; 86A; 86B; 86G; 86H; 86I/01; 86I/02; 86I/03; 86I/04; 86I/05; 86I/06; 86I/07; 86I/08; 86I/09; 86I/10; 86I/11; 86I/14; 86I/15; 86I/16; 86P/01; 86P/02; 86P/07; 86P/08; 86P/09; 86P/16; 21O/01; 21O/02; 21O/03; 21O/06; 21O/07; 21O/08; 21O/09; 21O/10; 21O/11; 21P/04; 21P/05; 21P/12; 63K/16; 32G/09; 32G/10; 32G/15; 32G/16; 12A/10; 12H/16
Lat/Long OENS-116.0000 -104.0000 68.0000 62.0000
Lat/Long OENS -66.5000 -65.7500 47.7500 47.1333
Lat/Long OENS-102.0000 -98.0000 56.0000 54.0000
Lat/Long OENS -75.0000 -74.0000 50.0000 49.5000
Lat/Long OENS -56.5833 -56.5833 48.6667 48.5000
Lat/Long OENS -56.0217 -56.0217 49.9317 49.8658
SujetsArchéen; gîtes volcanogènes; gîtes sulfureux; altération; métamorphisme; assemblages de minéraux; minéralisation; directives d'exploration; roches volcaniques; gisements minéraux; or; gîtes minéralogiques; méthodes d'exploration; prospection minière; exploration de dépôts glaciaires; géochimie des dépôts glaciaires; tills; géochimie du till; éléments d'indice; dépôts glaciaires; topographie glaciaire; elements glaciaires; antecedents glaciaires; transport des sediments; méthodes d'échantillonage; techniques d'échantillonage; analyses géochimiques; lithologie des galets; sulfures; cuivre; plomb; zinc; argent; analyses spectrométriques; fluorescence aux rayons x; méthodes de fluorescence aux rayons x; Ceinture d'Abitibi Greenstone ; géologie économique; géologie des dépôts meubles/géomorphologie; Précambrien; Cénozoïque; Quaternaire
Illustrationslocation maps; plots; photomicrographs; ternary diagrams; tables
ProgrammeÉtude des gîtes de sulfures massifs volcaniques, Initiative géoscientifique ciblée (IGC-4)
Diffusé2015 06 11
Résumé(disponible en anglais seulement)
During the Quaternary, most of Canada's landmass was covered by ice sheets that eroded and dispersed metal-rich debris from volcanogenic massive sulphide (VMS) deposits across the landscape together with a blanket of unconsolidated debris. Therefore, boulder tracing, till geochemistry, and indicator minerals are important exploration methods for VMS deposits in Canada. This paper provides an overview of the development and application of these methods, including till sampling, appropriate size fractions of till to analyze, sample processing, and analytical techniques. Selected case histories from different regions across Canada are also presented.
Copper, Pb, and Zn are indicator elements of VMS deposits, and pathfinder elements include As, Ag, Au, Ba, Bi, Cd, Hg, In, Sb, Se, Sn, and Tl. Abundances of these elements are most commonly determined in the <0.063 mm (silt + clay) fraction of till. Indicator minerals of VMS deposits are recovered from the >3.2 specific gravity heavy mineral concentrate of till and include the main ore minerals (galena, sphalerite, chalcopyrite, pyrite, and pyrrhotite), accessory minerals (native gold, electrum, cassiterite, cinnabar, and barite), and, in metamorphic terrain, metamorphosed minerals of mineralization, alteration, or exhalites, including sillimanite, andalusite, gahnite, staurolite, and spessartine. Magnetite and its chemical composition may also be a useful VMS exploration tool. Ongoing and future research of drift exploration methods for VMS deposits will focus on reducing sample size, lowering analytical costs, and identifying new indicator minerals and chemical discrimination criteria.
GEOSCAN ID296546