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The Seafloor of Southeastern Canada

  • Alexandre NormandeauEmail author
  • David J. W. Piper
  • John Shaw
  • Brian J. Todd
  • D. Calvin Campbell
  • David C. Mosher
Chapter
Part of the World Geomorphological Landscapes book series (WGLC)

Abstract

Quaternary glaciations played a critical role in producing the modern landscape of the seafloor of southeastern Canada. Glacial landscapes such as cross-shelf troughs, fjords, recessional moraines and tunnel valleys were sculpted by the Laurentide Ice Sheet. Following deglaciation, relative sea level rise led to the formation of sandy bedforms and tidal scours on the continental shelf. In contrast, the deep-water margin was not directly modified by the ice sheet, but was significantly influenced by it. Large quantities of glacigenic sediments were distributed along the continental slope during the last glacial maximum through turbidity currents, contour currents and submarine landslides. Turbidity currents eroded submarine canyons and deposited submarine fans, which are among the largest sediment accumulations in southeastern Canada. Although the continental shelf and the deep-water margin have contrasting landscapes, they are genetically linked to tectonics and the pattern of retreat of the Laurentide Ice Sheet. This chapter gives an overview of the landscape and landforms of the seafloor of southeastern Canada and details how its glacial heritage played a major role in sculpting the modern seabed.

Keywords

Marine geology Sediment transport Seafloor Submarine glacial landforms Continental shelf and slope 

References

  1. Ashley GM (1990) Classification of large-scale subaqueous bedforms: a new look at an old problem-SEPM bedforms and bedding structures. J Sediment Res 60:160–172CrossRefGoogle Scholar
  2. Bolduc A, Duchesne MJ (2009) Découverte de mégadunes dans l’estuaire moyen du fleuve Saint-Laurent, Québec, Canada. Rev des Sci de l’Eau 22:125–134Google Scholar
  3. Boyd R, Scott DB, Douma M (1988) Glacial tunnel valleys and Quaternary history of the outer Scotian shelf. Nature 333:61–64CrossRefGoogle Scholar
  4. Campbell DC, Mosher DC (2016) Geophysical evidence for widespread Cenozoic bottom current activity from the continental margin of Nova Scotia, Canada. Mar Geol 378:237–260CrossRefGoogle Scholar
  5. Cochonat P, Ollier G, Michel JL (1989) Evidence for slope instability and current-induced sediment transport, the RMS Titanic wreck search area, Newfoundland rise. Geo-marine Lett 9:145–152CrossRefGoogle Scholar
  6. De Geer G (1889) Ändmoräner i trakten mellan Spånga och Sundbyberg. Geol Föreningens i Stock Förhandlingar 11:395–397CrossRefGoogle Scholar
  7. Deptuck M, Campbell DC (2012) Widespread erosion and mass failure from the 51 Ma Montagnais marine bolide impact off southwestern Nova Scotia, Canada. Can J Earth Sci 49:1567–1594CrossRefGoogle Scholar
  8. Dietrich P, Ghienne JF, Schuster M et al (2017a) From outwash to coastal systems in the Portneuf-Forestville deltaic complex (Québec North Shore): anatomy of a forced regressive deglacial sequence. Sedimentology 64:1044–1078CrossRefGoogle Scholar
  9. Dietrich P, Ghienne J-F, Normandeau A, Lajeunesse P (2017b) Reconstructing ice-margin retreat using delta morphostratigraphy. Sci Rep 7:16936.  https://doi.org/10.1038/s41598-017-16763-xCrossRefGoogle Scholar
  10. Duchesne MJ, Pinet N, Bédard K et al (2010) Role of the bedrock topography in the Quaternary filling of a giant estuarine basin: The Lower St. Lawrence Estuary, Eastern Canada. Basin Res 22:933–951Google Scholar
  11. Grant DR (1989) Quaternary geology of the Atlantic Appalachian region of Canada. Quaternary geology of Canada and Greenland 1:391–440CrossRefGoogle Scholar
  12. Harris PT, Macmillan-Lawler M, Rupp J, Baker EK (2014) Geomorphology of the oceans. Mar Geol 352:4–24CrossRefGoogle Scholar
  13. Jenner KA, Piper DJW, Campbell DC, Mosher DC (2007) Lithofacies and origin of late Quaternary mass transport deposits in submarine canyons, central Scotian Slope, Canada. Sedimentology 54:19–38CrossRefGoogle Scholar
  14. King LH (1969) Submarine end moraines and associated deposits on the Scotian Shelf. Geol Soc Am Bull 80:83–96CrossRefGoogle Scholar
  15. King LH, Fader GB (1986) Wisconsinan glaciation of the Atlantic continental shelf of southeast Canada. Geological Survey of Canada, Paper 86 1AGoogle Scholar
  16. Kuenen PH (1952) Estimated size of the Grand Banks turbidity current. Am J Sci 250:874–884CrossRefGoogle Scholar
  17. Li MZ, Amos CL, Heffler DE (1997) Boundary layer dynamics and sediment transport under storm and non-storm conditions on the Scotian Shelf. Mar Geol 141:157–181CrossRefGoogle Scholar
  18. Li MZ, King EL (2007) Multibeam bathymetric investigations of the morphology of sand ridges and associated bedforms and their relation to storm processes, Sable Island Bank, Scotian Shelf. Mar Geol 243:200–228CrossRefGoogle Scholar
  19. Li MZ, Shaw J, Todd BJ et al (2014) Sediment transport and development of banner banks and sandwaves in an extreme tidal system: Upper Bay of Fundy, Canada. Cont Shelf Res 83:86–107CrossRefGoogle Scholar
  20. Lindén M, Möller P (2005) Marginal formation of De Geer moraines and their implications to the dynamics of grounding-line recession. J Quat Sci 20:113–133CrossRefGoogle Scholar
  21. Mosher DC, Campbell DC (2011) The Barrington submarine mass-transport deposit, western Scotian slope, Canada. Mass-Transport Depos Deep Settings, SEPM Spec Publ No 96:151–159Google Scholar
  22. Mosher DC, Piper DJW (2007) Analysis of multibeam seafloor imagery of the Laurentian Fan and the 1929 Grand Banks landslide area. In: Lykousis V, Sakellariou D, Locat J (eds) Submarine mass movements and their consequences. Advances in natural and technological hazards research, vol 27, Springer, Dordrecht, pp 77–88Google Scholar
  23. Mosher DC, Campbell DC, Gardner JV et al (2017) The role of deep-water sedimentary processes in shaping a continental margin: the northwest Atlantic. Mar Geol 393:245–259CrossRefGoogle Scholar
  24. Mosher DC, Piper DJW, Calvin Campbell D, Jenner KA (2004) Near-surface geology and sediment-failure geohazards of the central Scotian Slope. Am Assoc Pet Geol Bull 88:703–723Google Scholar
  25. Mucci A, Bernier G, Guignard C (2015) Mercury remobilization in Saguenay Fjord (Quebec, Canada) sediments: insights following a mass-flow event and its capping efficiency. Appl Geochem 54:13–26CrossRefGoogle Scholar
  26. Normandeau A, Lajeunesse P, St. Onge G (2013) Shallow-water longshore drift-fed submarine fan deposition (Moisie River Delta, Eastern Canada). Geo-Marine Lett 33:391–403CrossRefGoogle Scholar
  27. Normandeau A, Lajeunesse P, St. Onge G (2015) Submarine canyons and channels in the Lower St. Lawrence Estuary (Eastern Canada): morphology, classification and recent sediment dynamics. Geomorphology 241:1–18CrossRefGoogle Scholar
  28. Normandeau A, Lajeunesse P, Poiré AG, Francus P (2016) Morphological expression of bedforms formed by supercritical sediment density flows on four fjord-lake deltas of the south-eastern Canadian Shield (Eastern Canada). Sedimentology 63:2106–2129CrossRefGoogle Scholar
  29. Normandeau A, Campbell C, Piper DJW, Jenner KA (2018) New evidence for a major late-Quaternary submarine landslide on the external western levee of Laurentian Fan. Geol Soc London Spec Publ 477Google Scholar
  30. Normandeau A, Lajeunesse P, St. Onge G, Bourgault D, St. Onge-Drouin S, Senneville S, Belanger S (2014) Morphodynamics in sediment-starved inner-shelf submarine canyons (Lower St. Lawrence Estuary, Eastern Canada). Mar Geol 357:243–255Google Scholar
  31. Normandeau A, Dietrich P, Lajeunesse P, St. Onge G, Ghienne J-F, Duchesne MJ, Francus P (2017) Timing and controls on the delivery of coarse sediment to deltas and submarine fans on a formerly glaciated coast and shelf. Geol Soc Am Bull 129:1424–1441Google Scholar
  32. Normandeau A, Calvin Campbell D, Matthieu JBC (2019a) The influence of turbidity currents and contour currents on the distribution of deep‐water sediment waves offshore eastern Canada. SedimentologyGoogle Scholar
  33. Normandeau A et al (2019b) Are submarine landslides an underestimated hazard on the western North Atlantic passive margin?. Geol 47(9):848–852. Google Scholar
  34. Normandeau A, Bourgault D, Neumeier U, Lajeunesse P, St‐Onge G, Gostiaux L, Chavanne C (in press) Storm‐induced turbidity currents on a sediment‐starved shelf: insight from direct monitoring and repeat seabed mapping of upslope migrating bedforms. SedimentologyGoogle Scholar
  35. Pe-Piper G, Piper DJW, Jansa LF, De Jonge A (2007) Early Cretaceous opening of the North Atlantic Ocean: implications of the petrology and tectonic setting of the Fogo Seamounts off the SW Grand Banks, Newfoundland. Geol Soc Am Bull 119:712–724CrossRefGoogle Scholar
  36. Peltier WR (1998) Postglacial variations in the level of the sea: implications for climate dynamics and solid-earth geophysics. Rev Geophys 36:603–689CrossRefGoogle Scholar
  37. Pinet N, Brake V, Campbell C, Duchesne MJ (2015) Geomorphological characteristics and variability of Holocene mass-transport complexes, St. Lawrence River Estuary, Canada. Geomorphology 228:286–302CrossRefGoogle Scholar
  38. Piper DJW, Cochonat P, Morrison ML (1999) The sequence of events around the epicentre of the 1929 Grand Banks earthquake: initiation of debris flows and turbidity current inferred from sidescan sonar. Sedimentology 46(1):79–97Google Scholar
  39. Piper DJW (2005) Late Cenozoic evolution of the continental margin of eastern Canada. Nor J Geol 85:305–318Google Scholar
  40. Piper DJW, Campbell DC (2005) Quaternary geology of Flemish Pass and its application to geohazard evaluation for hydrocarbon development. Geol Assoc Can Spec Pap 43:29–43Google Scholar
  41. Piper DJW, Ingram S (2003) Major Quaternary sediment failures on the east Scotian Rise, eastern Canada. Curr Res Geol Surv Can 2003–D1:1–7Google Scholar
  42. Piper DJW, Shaw J, Skene KI (2007) Stratigraphic and sedimentological evidence for late Wisconsinan sub-glacial outburst floods to Laurentian Fan. Palaeogeogr Palaeoclimatol Palaeoecol 246:101–119CrossRefGoogle Scholar
  43. Piper DJW, Campbell DC, Mosher DC (2016) Mid-latitude complex trough-mouth fans, Laurentian and Northeast fans, eastern Canada. In: Dowdeswell JA, Canals M, Jakobsson M, et al (eds) Atlas of submarine glacial landforms: modern, Quaternary and ancient. Geol Soc London, pp 363–364Google Scholar
  44. Poiré AG, Lajeunesse P, Normandeau A, Francus P, St-Onge G, Nzekwe OP (2018) Late-Quaternary glacial to postglacial sedimentation in three adjacent fjord-lakes of the Québec North Shore (eastern Canadian Shield). Quat Sci Rev 186:91–110Google Scholar
  45. Rashid H, Mackillop K, Sherwin J, Piper DJW, Marche B, Vermooten M (2017) Slope instability on a shallow contourite-dominated continental margin, southeastern Grand Banks, eastern Canada. Mar Geol 393:203–215Google Scholar
  46. Rebesco M, Stow D (2001) Seismic expression of contourites and related deposits: a preface. Mar Geophys Res 22:303–308CrossRefGoogle Scholar
  47. Ruffman A, Hann V (2001) The Newfoundland Tsunami of November 18, 1929: an examination of the twenty-eight deaths of the “South Coast Disaster”. Newfoundl Labrador Stud 21:1719–1726Google Scholar
  48. Schulten I et al (2019) Surficial sediment failures due to the 1929 Grand Banks Earthquake, St Pierre Slope. Geological Society, London. Spec Publ 477(1):583–596Google Scholar
  49. Shaw J (2005) Geomorphic evidence of postglacial terrestrial environments on Atlantic Canadian continental shelves. Géog Phys Quat 59:141–154Google Scholar
  50. Shaw J, Forbes DL (1995) The postglacial relative sea-level lowstand in Newfoundland. Can J Earth Sci 32:1308–1330CrossRefGoogle Scholar
  51. Shaw J, Potter DP (2015) Surficial geology, coastal waters, Island of Newfoundland, Newfoundland and Labrador. Geol Surv Canada Open File Bulletin 6:130Google Scholar
  52. Shaw J, Potter DP (2016) Anthropogenic modification of a fjord: Bay of Islands, Newfoundland. Geol Soc London, Mem 46:121–122CrossRefGoogle Scholar
  53. Shaw J, Taylor R, Forbes D (1993) Impact of the Holocene transgression on the Atlantic coastline of Nova Scotia. Géogr Phys Quat 47:221–238Google Scholar
  54. Shaw J, Gareau P, Courtney RC (2002) Paleogeography of Atlantic Canada 13-0 kyr. Quat Sci Rev 21:1861–1878CrossRefGoogle Scholar
  55. Shaw J, Todd BJ, Li MZ (2014) Geologic insights from multibeam bathymetry and seascape maps of the Bay of Fundy, Canada. Cont Shelf Res 83:53–63CrossRefGoogle Scholar
  56. Shaw J, Piper DJW, Fader GBJ, King EL, Todd BJ, Bell T, Batterson MJ, Liverman DJE (2006) A conceptual model of the deglaciation of Atlantic Canada. Quat Sci Rev 25:2059–2081CrossRefGoogle Scholar
  57. Shaw J, Duffy G, Taylor RB, Chasse J, Frobel D (2008) Role of a submarine bank in the long-term evolution of the northeast coast of Prince Edward Island, Canada. J Coast Res 245:1249–1259CrossRefGoogle Scholar
  58. Shaw J, Amos CL, Greenberg DA, O’Reilly CT, Parrott DR, Patton E (2010) Catastrophic tidal expansion in the Bay of Fundy, Canada Earth Sciences Sector (ESS) Contribution 20090423. Can J Earth Sci 47:1079–1091CrossRefGoogle Scholar
  59. Shaw J, Potter DP, WU Y (2019) Geomorphic diversity and complexity of the inner shelf, Canadian Arctic Archipelago, based on LiDAR and multibeam sonar surveys. Can J Earth SciGoogle Scholar
  60. Shepard FP (1963) The Earth Beneath the Sea. History 3:480Google Scholar
  61. Stea RR, Piper DJW, Fader GBJ, Boyd R (1998) Wisconsinan glacial and sea-level history of Maritime Canada and the adjacent continental shelf: a correlation of land and sea events. Geol Soc Am Bull 110:821–845CrossRefGoogle Scholar
  62. Talling PJ (2014) On the triggers, resulting flow types and frequencies of subaqueous sediment density flows in different settings. Mar Geol 352:155–182CrossRefGoogle Scholar
  63. Talling P, Clare M, Urlaub M, Pope E (2014) Large submarine landslides on continental slopes: geohazards, methane release, and climate change. Oceanography 27:32–45CrossRefGoogle Scholar
  64. Todd BJ (2016a) Recessional moraines on the southern Scotian Shelf of Atlantic Canada. Geol Soc London, Mem 46:257–258CrossRefGoogle Scholar
  65. Todd BJ (2016b) De Geer moraines on German Bank, southern Scotian Shelf of Atlantic Canada. Geol Soc London, Mem 46:259–260CrossRefGoogle Scholar
  66. Todd BJ, Shaw J (2012) Laurentide Ice Sheet dynamics in the Bay of Fundy, Canada, revealed through multibeam sonar mapping of glacial landsystems. Quat Sci Rev 58:83–103CrossRefGoogle Scholar
  67. Todd BJ, Shaw J, Valentine PC (2016) Submarine glacial landforms on the Bay of Fundy–northern Gulf of Maine continental shelf. Geol Soc London, Mem 46:429–436CrossRefGoogle Scholar
  68. Todd BJ, Fader GBJ, Courtney RC, Pickrill RA (1999) Quaternary geology and surficial sediment processes, Browns Bank, Scotian Shelf, based on multibeam bathymetry. Mar Geol 162:165–214CrossRefGoogle Scholar
  69. Todd BJ, Valentine PC, Longva O, Shaw J (2007) Glacial landforms on German Bank, Scotian Shelf: evidence for Late Wisconsinan ice-sheet dynamics and implications for the formation of De Geer moraines. Boreas 36:148–169CrossRefGoogle Scholar
  70. Todd BJ, Shaw J, Li MZ, Kostylev VE, Wu Y (2014) Distribution of subtidal sedimentary bedforms in a macrotidal setting: the bay of fundy, Atlantic Canada. Cont Shelf Res 83:64–85Google Scholar
  71. Tripsanas EK, Piper DJW (2008) Glaciogenic debris-flow deposits of Orphan Basin, offshore eastern Canada: sedimentological and rheological properties, origin, and relationship to meltwater discharge. J Sediment Res 78:724–744CrossRefGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Alexandre Normandeau
    • 1
    Email author
  • David J. W. Piper
    • 1
  • John Shaw
    • 1
  • Brian J. Todd
    • 1
  • D. Calvin Campbell
    • 1
  • David C. Mosher
    • 1
  1. 1.Geological Survey of Canada (Atlantic), Natural Resources CanadaBedford Institute of OceanographyDartmouthCanada

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