| Titre | Indicator mineral dispersal trains of northern Canada in a modern glacial and mineralogical context |
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| Auteur | Paulen, R C |
| Source | GAC-MAC-IAH 2019: where geosciences converge
/AGC-AMC-AIH 2019 : où les géosciences convergent; GAC-MAC-IAH Reunion conjoint, Volume de résumés vol. 42, 2019 p. 156  Accès ouvert |
| Liens | Online - En ligne (complete volume, volume
complet, PDF, 6.08 MB)
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| Image |  |
| Année | 2019 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20180469 |
| Éditeur | Association géologique du Canada |
| Réunion | GAC-MAC-IAH 2019 / AGC-AMC-AIH 2019; Québec, QC; CA; mai 12-15, 2019 |
| Document | publication en série |
| Lang. | anglais |
| Media | en ligne; numérique |
| Formats | pdf (Adobe® Reader®) |
| Sujets | gisements minéraux; prospection minière; méthodes d'exploration; antecedents glaciaires; glaciation; déglaciation; écoulement glaciaire; erosion glaciaire; transport des sediments; dispersion des
sédiments; profils de dispersion; antecedents de sedimentation; milieu sédimentaire; topographie glaciaire; dépôts glaciaires; Calotte glaciaire Laurentide; directions d'écoulement glaciaire; traînées de dispersion; courants glaciaires; géologie des
dépôts meubles/géomorphologie; géologie économique; minéralogie; géochimie; Sciences et technologie; Nature et environnement; Phanérozoïque; Cénozoïque; Quaternaire |
| Programme | GEM2 : La géocartographie de l'énergie et des minéraux Cartographie des dépôts meubles du sud du Mackenzie du corridor de Mackenzie |
| Diffusé | 2019 05 01 |
| Résumé | (disponible en anglais seulement)
Glacial erosion, transport, and deposition has formed trains or fans of metal-rich debris down-ice from mineral deposits that are much larger exploration
targets than their bedrock sources. Dispersal patterns may be the result of one or more phases of ice flow and vary in length from a few tens of meters to >100 km. Recognizing the complexity of continental ice sheets and ice-sheet dynamics is
essential to understand the variation in glacial dispersal patterns and successfully searching for mineralized sources. Boulder tracing and till geochemistry have been widely used as exploration tools in glaciated terrain for more than 60 years. In
the past 25 years, indicator mineral methods applied to till have become complementary key exploration tools. Geochemical and isotopic studies of recovered heavy minerals can then be used to provide information on sources of the grains, deposit types
and potentially a vector towards mineralization. Indicator mineral chemistry has evolved considerably since the garnet classifications for diamondiferous kimberlite exploration and is now applied to a variety of mineral deposit types. The
identification of glacial dispersal landforms and sedimentary deposits formed by fast-flowing glaciers was important to the earliest recognition of palaeo-ice streams of the Laurentide Ice Sheet in the 1970 and 1980s. In recent years, our
understanding and reconstructions of the Laurentide Ice Sheet has undergone a new palaeo-ice stream paradigm, whereby we recognize that ice streams have impacted a large portion of the glacial landscape. The long (10s of km) dispersal trains of till
with distinct chemical and/or mineralogical compositions, coupled with obvious erosive/depositional corridors of streamlined landforms, provide a means of identifying and reinterpreting unsourced dispersal trains impacted by hard-bedded ice streams
in northern Canada. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Discours principal à la session sur les minéraux indicateurs à GAC-MAC-IAH. Cette présentation résumera l'avancement des recherches de la CGC en
matière de prospection de galeries au cours des deux dernières décennies. |
| GEOSCAN ID | 314583 |
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