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TitleGeotechnical Analysis of Labrador Shelf Sediments and the Influence of Ice Contact Processes
AuthorSilva, A J; Dadey, K A; Josenhans, H W; Laine, E P
SourceGeological Survey of Canada, Open File 1395, 1985, 68 pages, (Open Access)
Documentopen file
Mediapaper; on-line; digital
File formatpdf
ProvinceEastern offshore region; Newfoundland and Labrador
NTS3D; 3E; 13A; 13B; 13C; 13F; 13G; 13H; 13I; 13J; 13K; 13N; 13O; 13P; 14; 15D; 15C; 15E; 15F; 24P; 25A
AreaLabrador Shelf; Labrador
Lat/Long WENS -66.0000 -52.0000 62.0000 52.0000
Subjectsgeophysics; stratigraphy; surficial geology/geomorphology; sediments; sea ice; geophysical surveys; tills; glacial deposits; glacial features; glaciation; glacial history; lithology; glaciomarine deposits; carbonates; holocene; pleistocene; seismic surveys; stratigraphic correlations; seismic profiles; Hudson Strait Till; Quaternary; Cenozoic; Tertiary; Mesozoic
Precision Document Management
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Geological Survey of Canada (Atlantic)
Natural Resources Canada Library - Ottawa (Earth Sciences)
Natural Resources Canada library - Vancouver (Earth Sciences)
Natural Resources Canada library - Calgary (Earth Sciences)
Released1987 01 01; 2011 12 22; 2018 10 09
AbstractThe report describes the basic geotechnical characteristics of the Labrador Shelf (Quaternary) sediments complicated by the interaction of ice with the seafloor. This investigation integrates geophysical and geological studies with geotechnical data to understand the influence of ice contact processes on sediment characteristics and to gain further insight into sediment history. Three sedimentary units have been identified on the Labrador Shelf. Unit 3b, the Upper Till, is overconsolidated in shallow water near the ice sheet perimeter, due to the action of ice grounding. In deeper water this unit has not experienced significant loading from ice contact. The Hudson Strait Till (Unit 3c) also did not experience appreciable ice loading. Most of Unit 4, a pro- and post-glacial marine sediment , is normally consolidated with no ice loading. There is evidence of loading of some strata which is attributed to iceberg scouring. This evidence indicates that scouring increases shear strength and decreases water content in sediments of this type. We conclude that the sediments of the Labrador Shelf attributed to the last glaciation, i.e. units 3b, 4, and 5, have never experienced significant consolidating stresses due to loads imposed by thick ice sheets. The moderate amounts of overconsolidation in the upper till (Unit 3b) are attributed to partial ice loading developed in a situation in which the ice mass was primarily hydrostatically supported.