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TitleSurficial geology and seabed features of Flemish Cap, offshore Island of Newfoundland, Newfoundland and Labrador
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorBroom, L; Cameron, G D MORCID logo
SourceGeological Survey of Canada, Open File 8827, 2021, 27 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediadigital; on-line
File formatpdf
ProvinceNewfoundland and Labrador; Eastern offshore region
AreaFlemish Cap; Island of Newfoundland
Lat/Long WENS -47.2500 -44.0000 48.2500 46.0000
Subjectsmarine geology; regional geology; surficial geology/geomorphology; geophysics; Science and Technology; Nature and Environment; marine sediments; glacial deposits; glacial landforms; glacial features; tills; sands; gravels; muds; drift deposits; moraines; lineations; ice scours; glacial history; glaciation; ice flow; bedrock geology; lithology; igneous rocks; intrusive rocks; granites; granodiorites; sedimentary rocks; submarine features; seafloor topography; geophysical surveys; acoustic surveys, marine; bathymetry; seismic surveys, marine; currents; bedforms; erosional features; Neoproterozoic; Labrador Current; North Atlantic Current; Ice caps; ice-flow directions; Phanerozoic; Cenozoic; Quaternary; Tertiary; Mesozoic; Cretaceous; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; models; pie charts; seismic profiles; profiles; tables
ProgramMarine Geoscience for Marine Spatial Planning
Released2021 10 14
Improved bathymetric data along with legacy seabed samples and seismic profile data have allowed for enhanced understanding of the surficial geology and seafloor morphology of Flemish Cap. Three surficial geology units are mapped: bedrock, till, and patchy sand and gravel cover. The bedrock units include a Neoproterozoic granite and granodiorite unit in the center of Flemish Cap, which is overlain by Cretaceous to Cenozoic sedimentary rocks. These units have then been overlain by till. A patchy sand and gravel deposit covers most of Flemish Cap, and was deposited mostly through ice-rafted debris and redistributed by the Labrador and the North Atlantic Currents. The improved bathymetric data has revealed megascale glacial lineations (MSGLs) incised mostly in soft bedrock or till and eroded bedrock lineations located on eastern and southern Flemish Cap. A glacial moraine has been identified for the first time on the north side of Flemish Cap. These glacial features are evidence of a late Quaternary glacial ice cap on Flemish Cap.
Summary(Plain Language Summary, not published)
Improved seafloor morphology data along with legacy seismic data and seabed samples have allowed for a better understanding of the surficial geology and morphology of Flemish Cap. Three surficial geology have been mapped including bedrock, glacial till and a patchy cover of sand and gravel. The improved visualization of the seafloor morphology suggest that glacially derived landforms cover a large portion of Flemish Cap. This provides stronger evidence that this region was glaciated during the late Quaternary. On top of the glacial deposits, the sand and gravel cover has been deposited and redistributed by ice begs and ocean currents.

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