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TitreOrigin and character of till and other diamictons and their applicability to mineral prospecting
AuteurLian, O B; Hickin, A S
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. 109-127
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; Yukon
SNRC82; 83; 84; 85; 92; 93; 94; 95; 96; 102; 103; 104; 105; 106; 107; 114; 115; 116; 117
Lat/Long OENS-141.0000 -113.5000 70.0000 48.0000
Sujetsgisements minéraux; prospection minière; techniques de prospection; exploration de dépôts glaciaires; directives d'exploration; dépôts glaciaires; tills; tills de fond; antecedents glaciaires; glaciation; déglaciation; transport des sediments; dispersion des sédiments; origine; régions émettrices; roches mères; milieu sédimentaire; clastes; stries; cisaillement; morphologie; formation de fissures; Canadian Cordillère; directions d'écoulement glaciaire; géologie économique; géologie des dépôts meubles/géomorphologie; sédimentologie; Phanérozoïque; Cénozoïque; Mésozoïque; Paléozoïque
Illustrationsblock diagrams; photographs; equal-area stereonet projections
ProgrammeSystèmes porphyriques, Initiative géoscientifique ciblée (IGC-5)
ProgrammeCRSNG Conseil de recherches en sciences naturelles et en génie du Canada
Résumé(disponible en anglais seulement)
The use of near-surface sediment sampling for mineral exploration, or drift prospecting, is a well-established technique in the Canadian Cordillera. To be useful, a geochemical or mineralogical signal detected in a sample must be from media with a decipherable transport history that enables the geochemical or mineralogical anomaly to be traced back to a primary bedrock source. Subglacial till, the sediment transported by, and deposited directly from, ice at the base of a glacier, with minimal sorting by water, is an excellent media for drift prospecting. It is commonly a first derivative of bedrock, with a transport path that is typically linear and predicable, even in cases with multiple ice-flow directions. Distinguishing subglacial till from other glacial and non-glacial deposits may, however, be challenging for mineral explorers. To this end, we review the origin and nature of till deposits, and those of other origins that may resemble till, in order to assist in identifying the distinctive characteristics that can be used to interpret genesis. Consistently recognizing and sampling subglacial till will simplify interpretation and ultimately increase the potential for new mineral deposit discoveries.
GEOSCAN ID308171