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

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 bathy...

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Bibliographic Details
Published in:Deep Sea Research Part II: Topical Studies in Oceanography
Main Authors: Baudin, Francois, Martinez, Philippe, Dennielou, Bernard, Charlier, Karine, Marsset, Tania, Droz, Laurence, Rabouille, Christophe
Format: Article in Journal/Newspaper
Language:English
Published: Pergamon-elsevier Science Ltd 2017
Subjects:
Organic matter
Recent sediments
South Atlantic Ocean
Turbidites
Online Access:https://archimer.ifremer.fr/doc/00369/47974/47999.pdf
https://doi.org/10.1016/j.dsr2.2017.01.009
https://archimer.ifremer.fr/doc/00369/47974/
Description
Summary: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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