GEOSCAN, résultats de la recherche

Menu GEOSCAN


TitreGlacial dispersal-trains in North America. Part 2: interpretation
AuteurRussell, H A J; Cummings, D I
SourceRFG 2018 - Resources for Future Generations, abstract volume; 1996, 2018 p. 1
Année2018
Séries alt.Ressources naturelles Canada, Contribution externe 20170368
ÉditeurInternational Union of Geological Sciences
RéunionRFG 2018 - Resources for Future Generations; Vancouver, BC; CA; 16-21 juin 2018
Documentlivre
Lang.anglais
Mediaen ligne; numérique
Référence reliéeCette publication est reliée Russell, H A J; Cummings, D I; (2018). Glacial dispersal-trains in North America. Part 1: description, RFG 2018 - Resources for Future Generations, abstract volume
Formatspdf
ProvinceCanada; Colombie-Britannique; Alberta; Saskatchewan; Manitoba; Ontario; Québec; Nouveau-Brunswick; Nouvelle-Écosse; Île-du-Prince-Édouard; Terre-Neuve-et-Labrador; Territoires du Nord-Ouest; Yukon; Nunavut
SNRC1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
Lat/Long OENS-141.0000 -52.0000 90.0000 40.0000
Sujetsdépôts glaciaires; tills; sables; elements glaciaires; topographie glaciaire; drumlins; antecedents glaciaires; glaciation; déglaciation; nappes glaciaires; dynamique sédimentaire; géologie du substratum rocheux; lithologie; roches ignées; roches intrusives; kimberlites; gisements minéraux; prospection minière; méthodes d'exploration; modèles; Calotte glaciaire Laurentide; traînées de dispersion; géologie des dépôts meubles/géomorphologie; géologie économique; Phanérozoïque; Cénozoïque; Quaternaire
ProgrammeSynthèse de GEM, GEM2 : La géocartographie de l'énergie et des minéraux
LiensOnline - En ligne (pdf, 83 KB)
Diffusé2018 06 01
Résumé(disponible en anglais seulement)
Sedimentary work beneath ice sheets-the generation of striations, drumlins, and dispersal trains-is commonly perceived to occur near the ice-sheet margin, beneath warm-based ice streams, whereas the interiors of ice sheets are commonly perceived as performing little sedimentary work due to sluggish flow and/or cold-based conditions. Here we document till dispersal-trains from northern Canada that question the universality of this perception. The MZ Dyke and CL-25 dispersal trains are linear trails of sand-sized indicator minerals in till that extend tens of kilometers westward of their kimberlite sources. Two sets of drumlins cross-cut the dispersal trains, and do so at a relatively high angle-approximately 25° and 12°, respectively. This suggests the trains formed prior to the drumlins, and likely farther upflow beneath the Laurentide Ice Sheet, and that drumlinization was a later and apparently erosive process that did not rework the sediment into a fan-shaped palimpsest train. Mineral-exploration models that only emphasize ice-marginal processes need to be reconsidered: it appears that dispersal trains can, at least in some cases, form farther upflow beneath the ice sheet, prior to drumlinization.
Résumé(Résumé en langage clair et simple, non publié)
Le texte présente la dispersion d'indicateurs dans un till, ayant des drumlins transversaux. Il soulève des questions quant à la génèse du till et l'origine du relief.
GEOSCAN ID306633