Organic carbon accumulation in modern sediments of the Angola basin influenced by the Congo deep sea fan

Type Article
Date 2017-08
Language English
Author(s) Baudin Francois1, Martinez Philippe2, Dennielou BernardORCID3, Charlier Karine2, Marsset TaniaORCID3, Droz Laurence4, Rabouille Christophe5, 6
Affiliation(s) 1 : Sorbonne Univ, UPMC Univ Paris 06, CNRS, Inst Sci Terre ISTeP,UMR 7193, 4 Pl Jussieu, F-75005 Paris, France.
2 : Univ Bordeaux, CNRS, UMR 5805, EPOC, Allee Geoffroy St Hilaire, F-33615 Pessac, France.
3 : IFREMER, Unite Geosci Marines, Dept REM, F-29280 Plouzane, France.
4 : Inst Univ Europeen Mer, CNRS, UMR 6538, Lab Domaines Ocean, Rue Dumont dUrville, F-29280 Plouzane, France.
5 : Univ Paris Saclay, UMR CEA CNRS UVSQ 8212, LSCE, Bat 12,Ave Terrasse, F-91198 Gif Sur Yvette, France.
6 : Univ Paris Saclay, IPSL, Bat 12,Ave Terrasse, F-91198 Gif Sur Yvette, France.
Source Deep-sea Research Part Ii-topical Studies In Oceanography (0967-0645) (Pergamon-elsevier Science Ltd), 2017-08 , Vol. 142 , P. 64-74
DOI 10.1016/j.dsr2.2017.01.009
WOS© Times Cited 10
Keyword(s) Organic matter, Recent sediments, South Atlantic Ocean, Turbidites
Abstract Geochemical data (total organic carbon-TOC content, δ13Corg, C:N, Rock-Eval analyses) were obtained on 150 core tops from the Angola basin, with a special focus on the Congo deep sea fan. Combined with the previously published data, the resulting dataset (322 stations) shows a good spatial and bathymetric representativeness. TOC content and δ13Corg maps of the Angola basin were generated using this enhanced dataset. The main difference in our map with previously published ones is the high terrestrial organic matter content observed downslope along the active turbidite channel of the Congo deep sea fan till the distal lobe complex near 5,000 m of water-depth. Interpretation of downslope trends in TOC content and organic matter composition indicates that lateral particle transport by turbidity currents is the primary mechanism controlling supply and burial of organic matter in the bathypelagic depths.
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Baudin Francois, Martinez Philippe, Dennielou Bernard, Charlier Karine, Marsset Tania, Droz Laurence, Rabouille Christophe (2017). Organic carbon accumulation in modern sediments of the Angola basin influenced by the Congo deep sea fan. Deep-sea Research Part Ii-topical Studies In Oceanography, 142, 64-74. Publisher's official version : https://doi.org/10.1016/j.dsr2.2017.01.009 , Open Access version : https://archimer.ifremer.fr/doc/00369/47974/