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Migrating submarine furrows on Gabonese margin (West Africa) from Miocene to present: Influence of bottom currents?
Biscara, L.; Mulder, T.; Gonthier, E.; Cremer, M.; Faugeres, J.-C.; Garlan, T. (2010). Migrating submarine furrows on Gabonese margin (West Africa) from Miocene to present: Influence of bottom currents? Geo-Temas 11: 21-22
In: Geo-Temas. Sociedad Geológica de España: Madrid. ISSN 1576-5172, more
Peer reviewed article  

Available in Authors 

Keyword
    Marine
Author keywords
    West African margin, Gabon, bottom currents, AAIW

Authors  Top 
  • Biscara, L.
  • Mulder, T.
  • Gonthier, E.
  • Cremer, M.
  • Faugeres, J.-C.
  • Garlan, T.

Abstract
    Several furrows have been mapped on the slope of the South Gabon continental margin, using a combination of geo-acoustic and core data. The seismic profiles studied display furrows 1-4 km wide and 100-170 m deep, that develop normal to the margin between 500 and 1500m water depth. These sedimentary structures were initiated above the major Oligocene unconformity and the developed within the Neogene to Present megasequence of progradation of the margin. The furrows show an agradation/progradation pattern, leading to margin parallel, northwestward migration of their axes through time until Present. A detailed analysis of the internal organization of these structures suggests the action of along-slope bottom current. The evolution of these migrating structures reveals that this northwestward bottom current occurred from the Miocene in the study area, probably in relation to the formation of the AAIW water.

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