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| Mejanelle, Laurence; Riviere, Beatrice; Pinturier, Laurence; Khripounoff, Alexis; Baudin, Francois; Dachs, Jordi. |
| Hydrocarbons were analyzed in sediments from the Congo River deep-sea fan, from the Congo River, and in sinking particles collected by sediment traps 40 m above the sediment. Studied sites encompassed three lobes of decreasing age of formation along the canyon: sites A, F and C and a another lobe system, disconnected from the active channel since 4 ka, Site E. Terrestrial long-chain odd n-alkanes were dominant in all sediments of the lobe system. Unsaturated terpenoids sourced by higher plants, such as gammacerene, lupene, ursene and oleanene, were also detected. At site C, characterized by high accumulation rates (10–20 cm yr−1), the organic matter spends less time in the oxic layer than at other sites and high phytadiene concentrations (10 to 17 μg... |
| Tipo: Text |
Palavras-chave: Congo fan; Hydrocarbons; NAH; Hopanes; Hopenes; Sediments; Turbidite system. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00388/49902/50472.pdf |
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| Bourget, J.; Zaragosi, S.; Garlan, T.; Gabelotaud, I.; Guyomard, P.; Dennielou, Bernard; Ellouz-zimmermann, N.; Schneider, J. L.. |
| During the Fanindien 2006 cruise of R/V 'Beautemps-Beaupre', high resolution multibeam bathymetry, sub-bottom profiling and sediment coring was carried out along the East African margin, offshore Tanzania and Mozambique (Indian Ocean). The newly acquired data reveal the presence of a giant deep-sea valley (the Tanzania channel) that is more than 10 km wide at 4000 m water depth, along the continental rise. The valley remains similar to 70 m deep and 7 km wide at 800 km from the Tanzania coast. Morphological comparison with worldwide submarine channels show that the Tanzania channel is one of the largest known submarine valleys. This discovery brings new light on development of submarine valleys that drain sediments originated from the East African Rift... |
| Tipo: Text |
Palavras-chave: Indian Ocean; East African margin; East African Rift System; Turbidite system; Submarine channel. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-6855.pdf |
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| Bourget, J.; Zaragosi, S.; Garlan, T.; Gabelotaud, I.; Guyomard, P.; Dennielou, Bernard; Ellouz-zimmermann, N.; Schneider, J. L.. |
| During the Fanindien 2006 cruise of R/V 'Beautemps-Beaupre', high resolution multibeam bathymetry, sub-bottom profiling and sediment coring was carried out along the East African margin, offshore Tanzania and Mozambique (Indian Ocean). The newly acquired data reveal the presence of a giant deep-sea valley (the Tanzania channel) that is more than 10 km wide at 4000 m water depth, along the continental rise. The valley remains similar to 70 m deep and 7 km wide at 800 km from the Tanzania coast. Morphological comparison with worldwide submarine channels show that the Tanzania channel is one of the largest known submarine valleys. This discovery brings new light on development of submarine valleys that drain sediments originated from the East African Rift... |
| Tipo: Text |
Palavras-chave: Indian Ocean; East African margin; East African Rift System; Turbidite system; Submarine channel. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/00324/43491/42958.pdf |
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| Deville, Eric; Mascle, A.; Callec, Y.; Huyghe, P.; Lallemant, S.; Lerat, O.; Mathieu, X.; De Carillo, C. Padron; Patriat, Martin; Pichot, Thibaud; Loubrieux, B.; Granjeon, D.. |
| Several marine geophysical data and piston-coring surveys acquired during the last decade allow one to better understand the close dynamic interactions between the sand-rich Orinoco turbidite system and the compressional structures of the Barbados prism. These interactions have been active since Eocene time as illustrated by the study of outcrops onshore Barbados Island. Because of strong morphologic and tectonic control in the east-Caribbean active margin, the present-day Orinoco turbiditic pattern system does not exhibit a classic fan geometry. The sea-floor geometry between the slope of the front of the Barbados prism and the slope of the South-American margin induces the convergence of the turbidite channels toward the abyssal plain, at the front of... |
| Tipo: Text |
Palavras-chave: Turbidite system; Active margin; Orinoco; Barbados. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00252/36373/34913.pdf |
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