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Quaternary sediment dynamics in the Belgica mound province, Porcupine Seabight: ice-rafting events and contour current processes

  • D. Van Rooij
  • D. Blamart
  • T. Richter
  • A. Wheeler
  • M. Kozachenko
  • J.-P. Henriet
Original Paper

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.

Keywords

Contourite Ice-rafting event British–Irish ice sheet Porcupine Basin Coral banks 

Notes

Acknowledgments

This study was funded through the OMARC EC FP5 GEOMOUND and ECOMOUND projects. We appreciate the efforts made by the captains, crews and shipboard parties of R/V Belgica (1997–2001), R/V Marion Dufresne (1999), R/V Discovery 248 (2000). Core MD99-2327 has been taken within the framework of the IMAGES programme. The IPEV and Yvon Balut are also thanked for the core acquisition and for logistic support. We are very grateful to S. Louwye for the use of the facilities of the UGent palaeontology lab. We also appreciated the discussions with J.-C. Duplessy and L. Labeyrie as well as the use of the LSCE facilities. O. Weber, M. Cremer and J. Saint-Paul (DGO, Université Bordeaux I) are acknowledged for their experience for the SCOPIX analyses. We would also like to thank A. Vaars and S. van der Gaast (NIOZ) for respectively the CORTEX XRF measurements and the discussion of the results. The authors would also like to acknowledge the many helpful and constructive comments of the reviewers J.C. Faugères and J.S. Laberg. DVR is a post-doctoral fellow funded by the FWO-Flanders.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • D. Van Rooij
    • 1
    • 2
  • D. Blamart
    • 2
  • T. Richter
    • 3
  • A. Wheeler
    • 4
  • M. Kozachenko
    • 5
  • J.-P. Henriet
    • 1
  1. 1.Renard Centre of Marine Geology (RCMG)Ghent UniversityGentBelgium
  2. 2.Laboratoire des Sciences de Climat et de l’Environnement (LSCE)Laboratoire mixte CNRS/CEAGif-sur-YvetteFrance
  3. 3.Royal Netherlands Institute for Sea Research (NIOZ)TexelThe Netherlands
  4. 4.Department of Geology and Environmental Research InstituteUniversity College CorkCorkIreland
  5. 5.Coastal and Marine Resources CentreUniversity College CorkCorkIreland

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