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Quaternary sediment dynamics in the Belgica mound province, Porcupine Seabight: ice-rafting events and contour current processes
Van Rooij, D.; Blamart, D.; Richter, T.; Wheeler, A.; Kozachenko, M.; Henriet, J.-P. (2007). Quaternary sediment dynamics in the Belgica mound province, Porcupine Seabight: ice-rafting events and contour current processes. Int. J. Remote Sens. 96(1): 121-140. https://dx.doi.org/10.1007/s00531-006-0086-6
In: International Journal of Remote Sensing. Taylor & Francis: London. ISSN 0143-1161; e-ISSN 1366-5901
Peer reviewed article  
Available in  Authors 
    Vlaams Instituut voor de Zee: Non-open access 144287 [ request ]
Keywords
    Geological time > Phanerozoic > Geological time > Cenozoic > Quaternary
    Glacial deposits
    Ice sheets
    Marine sedimentation
    Motion > Water motion > Water currents > Bottom currents
    Anthozoa [WoRMS]
    A, Atlantic [Marine Regions]; ANE, Porcupine Seabight [Marine Regions]
    Marine/Coastal
Author keywords
    Contourite; Ice-rafting event; British–Irish ice sheet; Porcupine Basin; Coral banks
Authors  Top 
  • Van Rooij, D.
  • Blamart, D.
  • Richter, T.
  • Wheeler, A.
  • Kozachenko, M.
  • Henriet, J.-P.
Abstract
    The Belgica cold-water coral banks on the eastern slope of the Porcupine Seabight are closely associated with bottom currents. In order to better understand the local temporal and spatial characteristics, as well as the palaeoclimatologic influences, a 26 m long core, taken on a small contourite drift, was studied. This sediment record of approximately 100 ka BP reveals new insights into the regional glacial and sedimentary processes, which are intrinsically linked to several geological, climatological, biological and hydrodynamic variables. The glacial sequences in the core contain six ice-rafting events (IRE). They are comparable with the North Atlantic Heinrich Events, although their characteristics show dominant influences from the proximal British-Irish Ice Sheet (BIIS). These IRE have a low magnetic susceptibility and are deposited during two or three ice-rafting pulses. The record of ice-rafting suggests a millennial-scaled BIIS destabilisation and confirms the start of a final retreat about 25 ka ago. Additionally, the glacial sequence corresponds to a muddy contourite, influenced by bottom-current strength variations during interstadials, possibly triggered by sporadic reintroductions of Mediterranean Outflow Water in a glacial North Atlantic Ocean. The interglacial sequence features an 11-m thick deep-water massive sand unit, probably deposited under a high-energy bottom-current regime.
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