| Titre | Models of deformation processes within subglacial tills - the application of microsedimentology
|
| |
| Auteur | Menzies, J; Paulen, R C |
| Source | Geoconvention 2020 abstracts; 2020 p. 1-3  Accès
ouvert |
| Liens | Online - En ligne
|
| Image |  |
| Année | 2020 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20190526 |
| Éditeur | Geoconvention Partnership |
| Réunion | Geoconvention 2020; Septembre 21-23, 2020 |
| Document | site Web |
| Lang. | anglais |
| Media | en ligne; numérique |
| Formats | pdf |
| Sujets | sediments; dépôts glaciaires; tills; déformation; modèles; glaciation; nappes glaciaires; mouvement de la glace; transport des sediments; sedimentation; milieu sédimentaire; rhéologie; cisaillement;
géologie des dépôts meubles/géomorphologie; sédimentologie; Nature et environnement; Sciences et technologie; Phanérozoïque; Cénozoïque; Quaternaire |
| Illustrations | modèles 3D |
| Programme | GEM2 : La géocartographie de l'énergie et des minéraux Cartographie des dépôts meubles du sud du Mackenzie du corridor de Mackenzie |
| Diffusé | 2020 09 01 |
| Résumé | (disponible en anglais seulement)
Subglacial sediments are subject to cycles of erosion, comminution, transportation, and deposition (emplacement) in very active, if ephemeral and often
spatially localised environments, where basal ice conditions are dynamic and ever changing. It is critically relevant to observe and detect how these mobilized sediments lodge as immobile sediments as a time-transgressive process. Within subglacial
bed environments, it has been shown that rheological processes occur at the microscale as distinctive sedimentological signatures. These signatures deserve further attention as they provide valuable information on subglacial sediment processes and
ultimately contribute to our understanding of till formation. A series of models of subglacial interface interaction is presented that demonstrate the likely interactions between basal ice, bedrock, and soft subglacial sediments, classified as (a)
(Model I) limited passive interactive sliding in which the moving ice is detached from its substrate; and (b) (Model II) dynamic active interactive sliding in which the ice mass is integrated with the substrate and shear fronts lie within the
substrate. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Résumé des recherches micromorphologiques glaciaires menées dans les sédiments glaciaires du sud des TN-O. Ceci est important pour mieux
comprendre les processus de formation du till, qui à leur tour, aident à déchiffrer la dispersion des minéraux dans les sédiments glaciaires. |
| GEOSCAN ID | 321775 |
|
|