IMIS | Flanders Marine Institute
 

Flanders Marine Institute

Platform for marine research

IMIS

Publications | Institutes | Persons | Datasets | Projects | Maps
[ report an error in this record ]basket (0): add | show Printer-friendly version

Evolución morfológica y estratigráfica plio-cuaternaria del umbral de camarinal (Estrecho de Gibraltar) basada en sondeos marinos
Esteras, M.; Izquierdo, J.; Sandoval, N.G.; Bahmad, A. (1999). Evolución morfológica y estratigráfica plio-cuaternaria del umbral de camarinal (Estrecho de Gibraltar) basada en sondeos marinos. Revista de la Sociedad Geologica de España 13(3-4): 539-550
In: Revista de la Sociedad Geologica de España. Sociedad Geologica de España: Madrid & Salamanca. ISSN 0214-2708, more
Peer reviewed article  

Available in  Authors 

Keyword
    Marine
Author keywords
    Gibraltar Strait, paleo-channels, submarine slumps, breccia, Plio-Quaternary

Authors  Top 
  • Esteras, M.
  • Izquierdo, J.
  • Sandoval, N.G.
  • Bahmad, A.

Abstract
    Boreholes drilled in the Strait of Gibraltar down to 222 m allow us to carry out a new interpretation of its Main Sill (Camarinal Sill). The Main Sill has been hitherto interpreted as a N-S range of flysch units resistant to marine erosion. The results now acquired show that it consists of two E-W paleo-channels, eroded until 650 m deep and separated by a central flysch outcrop (Monte Tartesos). The ages of the main events involved in the erosion of the channels are not yet fixed. The first stages could be contemporaneous with the opening of the Strait during the lower Pliocene or result of a later marine currents erosion. The infilling of the channels was initially due to the deposition of clay breccias result of the gravitational collapse of unstable areas placed in the surroundings. These breccias were partly eroded in the southern channel during a new erosional stage, which was followed by deposition of bio-lithoclastic sands transported by the intense Strait currents. Afterwards, but limited to certain areas, a conglomerate made of lithic and bioclastic pebbles of a clear coastal and platform origin was deposited. The last unit is constituted by a well cemented mounds of bioclasthic limestone (lithoherms) favoured by the high biogenic productivity associated to the current regime. The samples dated with U/Th in the first upper meter show an age of 150-180 ka.

All data in IMIS is subject to the VLIZ privacy policy Top | Authors