The Porcupine Contourite Depositional System: 2.6 Ma of competition between cold-water coral mounds and sediment drifts

D. Van Rooij; Veerle A.I. Huvenne; Ben De Mol; Bert Lietaert; Bram Van Eetvelt; Dominique Blamart; Eva Isabel Cacho Lascorz; I. Nicholas McCave; Jean-Pierre Henriet

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The Porcupine Contourite Depositional System: 2.6 Ma of competition between cold-water coral mounds and sediment drifts

David Van Rooij ^[1] ; Veerle A.I. Huvenne ^[2] ; Ben De Mol ^[3] ; Bert Lietaert ^[1] ; Bram Van Eetvelt ^[1] ; Dominique Blamart ^[4] ; Isabel Cacho ^[3] ; Nick McCave ^[5] ; Jean-Pierre Henriet ^[1]
1. [1] Ghent University
  
  Ghent University
  
  Arrondissement Gent, Bélgica
2. [2] National Oceanography Centre
  
  National Oceanography Centre
  
  GB.ENG.M4.24UJ, Reino Unido
3. [3] Universitat de Barcelona
  
  Universitat de Barcelona
  
  Barcelona, España
4. [4] Laboratoire des Sciences du Climat et de l'Environnement
  
  Laboratoire des Sciences du Climat et de l'Environnement
  
  Arrondissement de Palaiseau, Francia
5. [5] University of Cambridge
  
  University of Cambridge
  
  Cambridge District, Reino Unido
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Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 11, 2010 (Ejemplar dedicado a: Deep-Water Circulation: Processes & Products. International Congress. Baitona, Pontevedra, Spain. 16 & 17 June 2010), págs. 177-178
Idioma: inglés
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Resumen
- Along the eastern slope of the Porcupine Seabight, both cold-water coral mounds and a contouritedepositional system have developed since the start of the Quaternary. However, evidence of Miocene bottomcurrents has been documented in deeper seismic sections. Variations in bottom current strength over the last 10Ma have been instrumental as a driver for the localization and growth of these cold-water coral mounds. Viceversa, these biogenic build-ups have influenced the lateral variability and morphology of the contourite depositionalsystem. Both mounds and Quaternary drifts formed on top of a widespread unconformity, RD-1, that represents ahiatus of ~7 Ma (IODP Exp. 307 results). However, high-resolution seismic profiles have indicated the erosionphase may have been shorter, occurring in several phases within the Pliocene. This episode co-occurred with theintroduction of the Mediterranean Outflow Water in the Porcupine Seabight, which is the present-day driver oflocally strong bottom currents through internal tides.