Djibouti Ville Drift (SW Mediterranean): Sedimentation and record of bottom-current fluctuations during the Pleistocene and Holocene
Authors
Alonso, Belén; López-González, N. (Nieves); Bozzano, Grazziela; Casas, David; Ercilla, Gemma; Juan, Carmen; Estrada, Ferran; García, Marga; Vázquez-Garrido, J.T. (Juan Tomás); Cacho, Isabel; Palomino, D. (Desirée); d'Acremont, Elia; El-Moumni, Bouchta; MONTERA, Team; MOWER, TeamDate
2014-09-10Type
articleKeywords
Contouritedrift and moat deposits
sortable silt
paleocurrent
seamount
Alboran sea
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 ...
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