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TitleGeophysical evidence for widespread Cenozoic bottom current activity from the continental margin of Nova Scotia, Canada
AuthorCampbell, D C; Mosher, D C
SourceThe contourite log-book: significance for palaeoceanography, ecosystems and slope instability; by Van Rooij, D (ed.); Campbell, C (ed.); Rueggeberg, A (ed.); Wåhlin, A (ed.); Marine Geology vol. 378, 2016 p. 237-260, https://doi.org/10.1016/j.margeo.2015.10.005
Year2016
Alt SeriesEarth Sciences Sector, Contribution Series 20150157
PublisherElsevier
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf; html
ProvinceEastern offshore region; Nova Scotia
NTS1; 10; 11A; 11B; 20I
AreaScotian Slope
Lat/Long WENS -65.5000 -55.2500 44.7500 40.0000
Subjectsmarine geology; surficial geology/geomorphology; geophysics; continental margins; continental slope; bottom currents; contourites; depositional analyses; bedforms; geophysical surveys; seismic reflection surveys; exploration wells; seafloor topography; erosional surfaces; marine sediments; Recent; Neogene; Paleogene; bedrock geology; lithology; sedimentary rocks; carbonates; salt deposits; diapirs; muds; sands; chalk; paleocurrents; paleocurrent directions; Scotian Margin; La Have Platform; Laurentian Formation; Banquereau Formation; Wyandot Formation; Abenaki carbonate bank; Deep Western Boundary Current; Gulf Stream; Upper Labrador Sea Water; Classic Labrador Sea Water; Denmark Strait Overflow Water; Iceland-Scotland Overflow Water; Antarctic Bottom Water; Shelburne Drift; Mohawk Drift; Shubenacadie Drift; Gully Drift; mass transport deposits; channel fill deposits; Phanerozoic; Cenozoic; Tertiary; Mesozoic; Cretaceous
Illustrationslocation maps; geological sketch maps; stratigraphic charts; tables; seismic reflection profiles; geophysical images; schematic cross-sections; diagrams; cartoons
ProgramPreparation of a submission for an extended continental shelf in the Atlantic and Arctic Oceans under UNCLOS, Delineating Canada's Continental Shelf Under UNCLOS
AbstractTwo-dimensional and three-dimensional multichannel seismic reflection data are utilized to examine previously unrecognized contourite depositional systems along the continental margin of Nova Scotia, Canada. Prior to this study these features were thought to be of limited extent in the study area. The new data show that contourite drifts are widespread with greatest drift development during the Late Miocene to Pliocene. Giant sediment waves form stacked, aggrading sequences of bedforms and their development is linked to pre-existing seafloor morphology. Small sediment drifts developed locally throughout the late Paleogene and Neogene, either southwest and down-current of seafloor obstacles or form channel fills. Major erosional pulses form regional seismic markers; first along the continental rise in the Early Oligocene, then along the continental slope during the Late Miocene and Pliocene. Three-dimensional seismic data show that erosion surfaces preserve along-slope amplitude anomalies, two-dimensional, low-relief sediment waves, and barchanoid bedforms. The geophysical evidence implies that a northeast-to-southwest, along-slope bottom current influenced Cenozoic depositional patterns throughout the study area.
Summary(Plain Language Summary, not published)
This paper presents evidence for widespread sediment drift deposits along the continental slope off Nova Scotia. The deposits play an important role in the shape of the continental margin and as a results have repercussion for defining the Foot of the Slope as applied to UNCLOS.
GEOSCAN ID296844