El modelo deposicional contornítico del talud medio del Golfo de Cádiz en el contexto morfosedimentario y estratigráfico del margen continental

• F.J. Hernández-Molina ^[6] ; E. Llave ^[1] ; D. Stow ^[7] ; M. García ^[2] ; L. Somoza ^[1] ; J.T. Vázquez ^[8] ; F. Lobo ^[3] ; M.C. Fernández-Puga ^[1] ; A. Maestro ^[1] ; T. Medialdea ^[1] ; V. Díaz del Río ^[4] ; T. Mulder ^[9] ; J. Gardner ^[5]
  1. [1] Instituto Geológico y Minero de España

     Instituto Geológico y Minero de España

     Madrid, España

     
  2. [2] Instituto de Ciencias del Mar

     Instituto de Ciencias del Mar

     Barcelona, España

     
  3. [3] Instituto Andaluz de Ciencias de la Tierra

     Instituto Andaluz de Ciencias de la Tierra

     Granada, España

     
  4. [4] Instituto Español de Oceanografía

     Instituto Español de Oceanografía

     Madrid, España

     
  5. [5] United States Naval Research Laboratory

     United States Naval Research Laboratory

     Estados Unidos

     
  6. [6] Facultad de Ciencias del Mar, Univ. de Vigo
  7. [7] Southampton Oceanography Centre (SOC)
  8. [8] Facultad de Ciencias del Mar, Univ. de Cádiz
  9. [9] Département de Géologie et Océanographie, Univ. Bordeaux

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• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 5, 2004 (Ejemplar dedicado a: VI CONGRESO GEOLÓGICO DE ESPAÑA, ZARAGOZA, 12-15 JULIO, 2004), págs. 175-178
• Idioma: español
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• Resumen

  • A study of the contourite depositional model of the middle slope of the Gulf of Cadiz is presented within the regional morphosedimentary and stratigraphic framework of the continental margin. The margin is characterized by: a) a lack of submarine canyons (except in the Algarve margin); b) a largeslope in which the middle slope is dominated by along-slope processes related to the Mediterranean Outflow Water (MOW) and generating the Contourite Depositional System (CDS) during the Pliocene and Quaternary; c) the dominance of down-slope processes across parts of the upper and lower slope and abyssal plain; d) the lack of true continental rise; and e) an active compressive structural context where the "Cadiz Allocthonous Unit" represents an unstable substratum for thelate Miocene, Pliocene and Quaternary sedimentation. The CDS on the Gulf of Cadiz's middleslope comprises five major morphosedimentary sectors related to the progressive deceleration ofthe MOW, bathymetric stress on the margin, and the Coriolis force. The CDS of the Gulf of Cadizcan be interpreted as a mixed Contourite-turbidite system (a detached combined drift system),which has developed in a mid-slope setting. This is rather different from the principal contourite systems along parts of the Northwest Atlantic margins, where the along-slope processes are developed in a more distal part of the mixed system. There may be closer similarities with the drift systems along the NW Hebridean margin.