Recent sediment transport and deposition in the Cap-Ferret Canyon, South-East margin of Bay of Biscay
Special issue Submarine Canyons: Complex Deep-Sea Environments Unravelled by Multidisciplinary Research.-- 11 pages, 5 figures, 2 tables
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| Format: | artículo biblioteca |
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Pergamon Press
2014-06
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| Subjects: | 234Th, Particulate flux, 210Pb, Cap-Ferret Canyon, Sediment transport, Sedimentation, Bioturbation, Bay of Biscay, |
| Online Access: | http://hdl.handle.net/10261/100100 |
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dig-icm-es-10261-1001002020-12-09T17:47:03Z Recent sediment transport and deposition in the Cap-Ferret Canyon, South-East margin of Bay of Biscay Schmidt, Sabine Howa, Hélène Diallo, Amy Martín, Jacobo Cremer, Michel Duros, Pauline Fontanier, Christophe Deflandre, Bruno Metzger, Edouard Mulder, Thierry 234Th Particulate flux 210Pb Cap-Ferret Canyon Sediment transport Sedimentation Bioturbation Bay of Biscay Special issue Submarine Canyons: Complex Deep-Sea Environments Unravelled by Multidisciplinary Research.-- 11 pages, 5 figures, 2 tables The Cap-Ferret Canyon (CFC), a major morphologic feature of the eastern margin of the Bay of Biscay, occupies a deep structural depression that opens about 60km southwest of the Gironde Estuary. Detailed depth profiles of the particle-reactive radionuclides 234Th and 210Pb in interface sediments were used to characterise the present sedimentation (bioturbation, sediment mass accumulation, and focusing) in the CFC region. Two bathymetric transects were sampled along the CFC axis and the southern adjacent margin. Particle fluxes were recorded from the nearby Landes Plateau by means of sediment traps in 2006 and 2007. This dataset provides a new and comprehensive view of particulate matter transfer in the Cap-Ferret Canyon region, through a direct comparison of the canyon with the adjacent southern margin. Radionuclide profiles (234Th and 210Pb) and mass fluxes demonstrate that significant particle dynamics occur on the SE Aquitanian margin in comparison with nearby margins. The results also suggest show three distinct areas in terms of sedimentary activity. In the upper canyon (<500m), there is little net sediment accumulation, suggesting a by-pass area. Sediment focusing is apparent at the middle canyon (500-1500m), that therefore acts as a depocenter for particles from the shelf and the upper canyon. The lower canyon (>2000m) can be considered inactive at annual or decadal scales. In contrast with the slow and continuous accumulation of relatively fresh material that characterises the middle canyon, the lower canyon receives pulses of sediment via gravity flows on longer time scales. At decadal scale, the CFC can be considered as a relatively quiescent canyon. The disconnection of the CFC from major sources of sediment delivery seems to limit its efficiency in particle transfer from coastal areas to the adjacent ocean basin. © 2013 Elsevier Ltd. Cruises were supported respectively by the ANR FORCLIM and EC2CO BIOMIN programs.The acquisition of the low-background gamma detector was funded in part by the CNRS (LEBE-CYBER), the Aquitain Research council and the University of Bordeaux. A3-year doctoral fellowship was provided to P.Duros by the Regional Council of Pays de la Loire Peer Reviewed 2014-07-17T11:38:06Z 2014-07-17T11:38:06Z 2014-06 2014-07-17T11:38:07Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1016/j.dsr2.2013.06.004 issn: 0967-0645 e-issn: 1879-0100 Deep Sea Research Part II: Topical Studies in Oceanography 104: 134-144 (2014) http://hdl.handle.net/10261/100100 10.1016/j.dsr2.2013.06.004 https://doi.org/10.1016/j.dsr2.2013.06.004 none Pergamon Press |
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234Th Particulate flux 210Pb Cap-Ferret Canyon Sediment transport Sedimentation Bioturbation Bay of Biscay 234Th Particulate flux 210Pb Cap-Ferret Canyon Sediment transport Sedimentation Bioturbation Bay of Biscay |
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234Th Particulate flux 210Pb Cap-Ferret Canyon Sediment transport Sedimentation Bioturbation Bay of Biscay 234Th Particulate flux 210Pb Cap-Ferret Canyon Sediment transport Sedimentation Bioturbation Bay of Biscay Schmidt, Sabine Howa, Hélène Diallo, Amy Martín, Jacobo Cremer, Michel Duros, Pauline Fontanier, Christophe Deflandre, Bruno Metzger, Edouard Mulder, Thierry Recent sediment transport and deposition in the Cap-Ferret Canyon, South-East margin of Bay of Biscay |
| description |
Special issue Submarine Canyons: Complex Deep-Sea Environments Unravelled by Multidisciplinary Research.-- 11 pages, 5 figures, 2 tables |
| format |
artículo |
| topic_facet |
234Th Particulate flux 210Pb Cap-Ferret Canyon Sediment transport Sedimentation Bioturbation Bay of Biscay |
| author |
Schmidt, Sabine Howa, Hélène Diallo, Amy Martín, Jacobo Cremer, Michel Duros, Pauline Fontanier, Christophe Deflandre, Bruno Metzger, Edouard Mulder, Thierry |
| author_facet |
Schmidt, Sabine Howa, Hélène Diallo, Amy Martín, Jacobo Cremer, Michel Duros, Pauline Fontanier, Christophe Deflandre, Bruno Metzger, Edouard Mulder, Thierry |
| author_sort |
Schmidt, Sabine |
| title |
Recent sediment transport and deposition in the Cap-Ferret Canyon, South-East margin of Bay of Biscay |
| title_short |
Recent sediment transport and deposition in the Cap-Ferret Canyon, South-East margin of Bay of Biscay |
| title_full |
Recent sediment transport and deposition in the Cap-Ferret Canyon, South-East margin of Bay of Biscay |
| title_fullStr |
Recent sediment transport and deposition in the Cap-Ferret Canyon, South-East margin of Bay of Biscay |
| title_full_unstemmed |
Recent sediment transport and deposition in the Cap-Ferret Canyon, South-East margin of Bay of Biscay |
| title_sort |
recent sediment transport and deposition in the cap-ferret canyon, south-east margin of bay of biscay |
| publisher |
Pergamon Press |
| publishDate |
2014-06 |
| url |
http://hdl.handle.net/10261/100100 |
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