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Djibouti Ville Drift (SW Mediterranean): Sedimentation and record of bottom current fluctuations during the Pleistocene and Holocene
Alonso, B.; López Gonzalez, N.; Bozzano, G.; Casas, D.; Vázquez, J.T.; Cacho, I.; Palomino, D.; d’Acremont, E.; El Moumni, B.; MONTERA Team; MOWER Team (2014). Djibouti Ville Drift (SW Mediterranean): Sedimentation and record of bottom current fluctuations during the Pleistocene and Holocene, in: Van Rooij, D. et al. (Ed.) Book of Abstracts. 2nd Deep-Water Circulation Congress: The Contourite Log-book. Ghent, Belgium, 10-12 September 2014. VLIZ Special Publication, 69: pp. 93-94
In: Van Rooij, D.; Rüggeberg, A. (Ed.) (2014). Book of Abstracts. 2nd Deep-Water Circulation Congress: The Contourite Log-book. Ghent, Belgium, 10-12 September 2014. VLIZ Special Publication, 69. Ghent University, Department of Geology and Soil Science/Flanders Marine Institute (VLIZ): Oostende. xviii, 152 pp., more
In: VLIZ Special Publication. Vlaams Instituut voor de Zee (VLIZ): Oostende. ISSN 1377-0950, more

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Keywords
    Seamounts; Marine
Author keywords
    Drift and moat deposits; Sortable silt; Paleocurrents; Alboran

Authors  Top 
  • Alonso, B.
  • López Gonzalez, N.
  • Bozzano, G.
  • Casas, D.
  • Vázquez, J.T.
  • Cacho, I.
  • Palomino, D.
  • d’Acremont, E.
  • El Moumni, B.
  • MONTERA Team
  • MOWER Team

Abstract
    Seismic profiles and sedimentological data (bulk fraction) of two sediment cores recovered from the Djibouti Ville Drift (SW Mediterranean Sea) indicate that bottom currents have played a fundamental role in shaping the sediment drift. The deposits are composed of biogenous to mixed muddy and silty contourites. A grain size analysis of the terrigenous fraction together with mineralogical, magnetic susceptibility, 14C-AMS dating and stable oxygen isotope data have been analysed to reconstruct glacial and interglacial changes in the bottom currents during the last 133kyr. The sharp vertical grain size changes in the moat and drift indicate that there were substantial bottom current acceleration and deceleration events with faster flow speeds being registered in the moat environment. In sediments from glacial periods (MIS2, MIS3, and MIS6) and stadials 5b and 5d, there is a low carbonate content, high levels of terrigenous elements and paleocurrent proxy values suggest faster flows with the exception of MIS4. Deposits from the interglacial period (MIS1) and interstadials 5a, 5c and 5e, have a high carbonate content, low levels of terrigenous elements, and the paleocurrent proxy values indicate slower flows.

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