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TitleModels of deformation processes within subglacial tills - the application of microsedimentology
AuthorMenzies, J; Paulen, R CORCID logo
SourceGeoconvention 2020 abstracts; 2020 p. 1-3 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesNatural Resources Canada, Contribution Series 20190526
PublisherGeoconvention Partnership
MeetingGeoconvention 2020; September 21-23, 2020
DocumentWeb site
Mediaon-line; digital
File formatpdf
Subjectssurficial geology/geomorphology; sedimentology; Nature and Environment; Science and Technology; sediments; glacial deposits; tills; deformation; models; glaciation; ice sheets; ice movement; sediment transport; deposition; depositional environment; rheology; shearing; Phanerozoic; Cenozoic; Quaternary
Illustrations3-D models
ProgramGEM2: Geo-mapping for Energy and Minerals Mackenzie Corridor, Southern Mackenzie Surficial Mapping
Released2020 09 01
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.
Summary(Plain Language Summary, not published)
A summary of glacial micromorphological researched conducted in glacial sediments of the southern NWT. This is important to better understand till forming processes, which in turn, aid in deciphering mineral dispersal in glacial sediments.

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