GEOSCAN, résultats de la recherche


TitreTill geochemical and indicator mineral methods in mineral exploration
AuteurMcClenaghan, M B; Thorleifson, L H; DiLabio, R N W
SourceOre Geology Reviews vol. 16, issue 3-4, 2000 p. 145-166,
LiensAbstract - Résumé
Séries alt.Commission géologique du Canada, Contributions aux publications extérieures 1999005
ÉditeurElsevier BV
Documentpublication en série
Mediapapier; en ligne; numérique
ProvinceTerre-Neuve-et-Labrador; Québec
Lat/Long OENS -64.5000 -63.5000 56.5000 56.2500
Lat/Long OENS -66.2500 -65.2500 44.5000 43.5000
Lat/Long OENS -84.0000 -74.0000 52.0000 48.0000
Sujetsgéochimie du till; géochimie du sédiment; exploration de dépôts glaciaires; prospection minière; elements glaciaires; dépôts glaciaires; dispersion des sédiments; diamant; kimberlites; or; géologie économique; géochimie; sédimentologie; géologie des dépôts meubles/géomorphologie
Illustrationslocation maps; geological sketch maps; schematic diagrams; cross-sections, stratigraphic
Résumé(disponible en anglais seulement)
This paper summarizes advances since 1987 in the application of glacial sediment sampling to mineral exploration drift prospecting. in areas affected by continental or alpine glaciation. In these exploration programs, clastic glacial sediments are tested by geochemical or mineralogical methods to detect dispersal trains of mineral deposit indicators that have been glacially transported from source by mechanical processes. In glaciated terrain the key sampling medium, till, is produced by abrasion, crushing and blending of rock debris and recycled sediment followed by down-ice dispersal ranging from a few metres to many kilometres. As a consequence of the mid-1980s boom in gold exploration, the majority of case studies and regional till geochemical surveys published in the past decade deal with this commodity. Approximately 30% of Canada and virtually all of Fennoscandia have been covered by regional till geochemical surveys that aid mineral exploration and provide baseline data for environmental, agricultural, and landuse planning. The most profound event in drift prospecting in the last decade, however, has been the early-1990s explosion in diamond exploration which has dramatically increased the profile of glacial geology and glacial sediment sampling and stimulated changes in sampling and analytical methods.