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Geo-Marine Letters

, Volume 3, Issue 2–4, pp 141–146 | Cite as

The Laurentian Fan: Sohm abyssal plain

  • David J. W. Piper
  • Dorrik A. V. Stow
  • William R. Normark
Article

Abstract

The 0.5- to 2-km thick Quaternary Laurentian Fan is built over Tertiary and Mesozoic sediments that rest on oceanic crust. Two 400-km long fan valleys, with asymmetric levees up to 700-m high, lead to an equally long, sandy, lobate basin plain (northern Sohm Abyssal Plain). The muddy distal Sohm Abyssal Plain is a further 400-km long. The sediment supplied to the fan is glacial in origin, and in part results from seismically triggered slumping on the upper continental slope. Sandy turbidity currents, such as the 1929 Grand Banks earthquake event, probably erode the fan-valley floors; but thick muddy turbidity currents build up the high levees.

Keywords

Debris Flow Turbidite Continental Slope Turbidity Current Abyssal Plain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag New York Inc. 1984

Authors and Affiliations

  • David J. W. Piper
    • 1
  • Dorrik A. V. Stow
    • 2
  • William R. Normark
    • 3
  1. 1.Atlantic Geoscience Centre, Geological Survey of CanadaBedford Institute of GeologyDartmouthCanada
  2. 2.Grant Institute of GeologyUniversity of EdinburghEdinburghScotland
  3. 3.U.S. Geological SurveyMenlo ParkUSA

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