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High-energy contourite settings related to North Atlantic Deep Water flow
Kuijpers, A.; Nielsen, T. (2014). High-energy contourite settings related to North Atlantic Deep Water flow, in: Van Rooij, D. et al. (Ed.) Book of Abstracts. 2nd Deep-Water Circulation Congress: The Contourite Log-book. Ghent, Belgium, 10-12 September 2014. VLIZ Special Publication, 69: pp. 31-32
In: Van Rooij, D.; Rüggeberg, A. (Ed.) (2014). Book of Abstracts. 2nd Deep-Water Circulation Congress: The Contourite Log-book. Ghent, Belgium, 10-12 September 2014. VLIZ Special Publication, 69. Ghent University, Department of Geology and Soil Science/Flanders Marine Institute (VLIZ): Oostende. xviii, 152 pp., more
In: VLIZ Special Publication. Vlaams Instituut voor de Zee (VLIZ): Oostende. ISSN 1377-0950, more
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Document type: Summary
Keywords
    Sediments > Clastics > Contourites
    A, North Atlantic [Marine Regions]
    Marine/Coastal
Author keywords
    Greenland-Scotland Ridge Overflow; North Atlantic Deep Water; Bottom current activity
Authors  Top 
  • Kuijpers, A.
  • Nielsen, T.
Abstract
    North Atlantic deep convection in the Greenland Sea region and Labrador - Irminger Sea basins leads to strong bottom current activity associated with Greenland-Scotland Ridge (GSR) overflow and deep western boundary current circulation. Seismic records and other evidence (e.g. side scan sonar) document strong bottom current action on the seabed in relation to the Nordic Seas overflow pathway from the Faroe-Shetland gateway via the Southern Greenland margin towards Davis Strait. Seabed evidence from the Greater Antilles Outer Ridge north of Puerto Rico demonstrates strong boundary current activity still persisting far south at western North Atlantic lower latitudes. Geomorphological response to this high-energy bottom boundary current regime is expressed in a variety of dynamic bedforms ranging from mega-scale contourites via well-defined sediment waves, sand ribbons and erosional furrows to small-scale ripple marks. Boundary current activity may interact with other seabed shaping processes as, for instance, downslope mass flow and turbidity currents. Combining known relationships between various bedform types and bottom water dynamics with results from actual current measurements and sediment core studies demonstrate important variations in this flow pattern having had a significant impact on contourite development through time.
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