TALLOBRE, Cédric; GIRESSE, Pierre; BASSETTI, Maria-Angela; LONCKE, Lies; BAYON, Germain; BUSCAIL, Roselyne; TUDRYN, Alina; ZARAGOSI, Sebastien

doi:10.1016/j.jsames.2019.03.011

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TALLOBRE, Cédric
Centre de Formation et de Recherche sur les Environnements Méditérranéens [CEFREM]

GIRESSE, Pierre
Centre de Formation et de Recherche sur les Environnements Méditérranéens [CEFREM]

BASSETTI, Maria-Angela
Centre de Formation et de Recherche sur les Environnements Méditérranéens [CEFREM]

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Journal of South American Earth Sciences. 2019-06, vol. 92, p. 167-183

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The Demerara Plateau is a marginal plateau which forms a bathymetric relief on the sea floor. Here, contourite deposits have been studied in detail, following the recent discovery of contourite sequences likely related to the bottom currents and linked both to contour current and peculiar sea-floor morphology. A chronostratigraphic framework, based on δ18O relative variations and palaeomagnetic events in sediment cores allows correlating sediment processes to current intensity changes and major climate phases (glacial or interglacial). The studied sediments are enriched in glauconitic grains. In addition, the glauconite mineralogical maturity can easily correlate to low sedimentation rate and slightly energetic bottom currents on the seafloor. Based on these data and using the glauconitic authigenic mineral as proxy for inferring the degree of winnowing at the sediment-water interface, we might put forward the hypothesis that the intensity of NADW is higher during the glacial stages and lower during interglacial periods.< Réduire

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Formation and evolution of glauconite in the Demerara Contourite depositional system related to NADW circulation changes during late Quaternary (French Guiana)

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