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TitreA novel approach using detrital apatite and till geochemistry to identify covered mineralization in the TREK area of the Nechako Plateau, British Columbia
AuteurMao, M; Rukhlov, A S; Rowins, S M; Hickin, A S; Ferbey, T; Bustard, A; Spence, J; Coogan, L A
SourceIndicator minerals in till and stream sediments of the Canadian Cordillera; par Ferbey, T (éd.); Plouffe, A (éd.); Hickin, A S (éd.); Geological Association of Canada, Special Paper vol. 50, 2017 p. 191-243
Année2017
Séries alt.Mineralogical Association of Canada, Topics in Mineral Sciences 47
ÉditeurAssociation géologique du Canada
ÉditeurAssociation minéralogique du Canada
Documentpublication en série
Lang.anglais
Mediapapier
Référence reliéeCette publication est contenue dans Ferbey, T; Plouffe, A; Hickin, A S; (2017). Indicator minerals in till and stream sediments of the Canadian Cordillera, Geological Association of Canada, Special Paper vol. 50
ProvinceColombie-Britannique
SNRC93B/12; 93B/13; 93C/05; 93C/06; 93C/07; 93C/09; 93C/10; 93C/11; 93C/12; 93C/13; 93C/14; 93C/15; 93C/16; 93F/01; 93F/02; 93F/03; 93F/04; 93F/06; 93F/07; 93F/08; 93F/09; 93F/10; 93F/11; 93F/14; 93F/15; 93F/16; 93G/04; 93G/05; 93G/12; 93G/13
Lat/Long OENS-125.8333 -123.5000 54.0000 52.2500
Sujetsgisements minéraux; prospection minière; techniques de prospection; exploration de dépôts glaciaires; gisements porphyriques; cuivre; or; molybdène; dépôts de brèches; gîtes de skarn; tungstène; nickel; oxydes de fer; régions émettrices; roches mères; dépôts glaciaires; tills; échantillons de till; géochimie du till; minéraux détritiques; apatite; chalcopyrite; or; antecedents glaciaires; glaciation; déglaciation; transport des sediments; dispersion des sédiments; analyses par microsonde électronique; analyse par spectromètre de masse; analyses discriminantes; analyses au microscope électronique à balayage; gîtes minéralogiques; géologie du substratum rocheux; lithologie; roches ignées; roches intrusives; diorites; intrusions; plutons; batholites; roches volcaniques; roches sédimentaires; roches métamorphiques; caractéristiques structurales; failles; Canadian Cordillère; Volcaniques d'Anahim ; Groupe de Chilcotin ; Groupe de Kasalka ; Groupe de Skeena ; Groupe de Bowser Lake ; Groupe d'Hazelton ; Groupe de Takla ; Complexe de Cache Creek ; Pluton de Frank Lake ; Assemblage de Quanchus ; Batholite d'Endako ; Complexe de Vanderhoof Metamorphic ; directions d'écoulement glaciaire; Méthodologie; géologie économique; géologie des dépôts meubles/géomorphologie; géochimie; Phanérozoïque; Cénozoïque; Quaternaire; Tertiaire; Mésozoïque; Crétacé; Jurassique; Trias; Paléozoïque; Permien
Illustrationsgeoscientific sketch maps; tables; ternary diagrams; flow diagrams; diagrams
ProgrammeSystèmes porphyriques, Initiative géoscientifique ciblée (IGC-5)
Résumé(disponible en anglais seulement)
Resistant indicator minerals (RIM) have been used in mineral exploration in recent years to help identify and locate buried deposits because their compositions reflect their source rocks and, in some cases, specific types of mineral deposits. Apatite is a potential RIM because, in addition to its resistance to physical and chemical weathering, it is widespread in most rocks and mineral deposits. Our previous work discriminated the major types of mainly magmatic-hydrothermal mineral deposits in terms of linear discriminant functions using the Mg, V, Mn, Sr, Y, La, Ce, Eu, Dy, Tb, Pb, Th and U contents of apatites. Step-wise discrimination diagrams permit subdividing apatites by origin. We have analyzed detrital apatite grains recovered from till in ten study areas from the glaciated and underexplored Nechako Plateau of central British Columbia by electron probe microanalysis and laser ablation-inductively coupled plasma mass spectrometry. To aid interpreting these apatite data, we also used till geochemistry, and detrital chalcopyrite and gold grain counts. A total of 342 apatite grains (344 analyses) were classified as associated with mineralization, whereas 41 apatite grains were classified as derived from barren rocks, and two grains were classified as 'unknown'. Mineralization-related apatite grains were classified as alkalic porphyry Cu-Au (80), porphyry Cu-Mo-Au (28), porphyry Mo (72), porphyry-related Cu-Au breccia (16), W skarn (112), orogenic Au (26), orogenic Ni-Cu (7), and Kiruna-type IOA (3) deposit-types. Detrital apatite grains in till down-ice from developed mineral prospects in brownfield areas were correctly identified by the discriminant method. Detrital apatites also helped to generate many new exploration targets in greenfield areas lacking known mineralization or hosting only minor mineral occurrences. These findings validate the apatite discriminant method and demonstrate its usefulness as a practical exploration tool in grassroots programs.
GEOSCAN ID308177