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Title

Djibouti Ville Drift (SW Mediterranean): Sedimentation and record of bottomcurrent fluctuations during the Pleistocene and Holocene

AuthorsAlonso, Belén ; Ercilla, Gemma ; Juan, Carmen ; Estrada, Ferran ; García, Marga ; MONTERA Team; MOWER Team
KeywordsPaleocurrents
Seamount
Drift and moat deposits
Alboran
Sortable silt
Issue DateSep-2014
PublisherFlanders Marine institute
CitationBook of Abstracts. 2nd Deep-Water Circulation Congress: The Contourite Log-book. Ghent, Belgium, 10-12 September 2014: 93-94 (2014)
VLIZ Special Publications 69: 93-94 (2014)
AbstractSeismic 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
Description2nd Deep-Water Circulation Congress: The Contourite Log-book, 10-12 September 2014, Ghent, Belgium.-- Alonso, Belén ... et. al.-- 2 pages, 1 figure
Publisher version (URL)http://www.vliz.be/en/vliz-special-publications?year=2014#filter
URIhttp://hdl.handle.net/10261/109694
Identifiersissn: 1377-0950
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