Distribution and quality of sedimentary organic matter on the Aquitanian margin (Bay of Biscay) |
| |
| Institution: | 1. Département de Géologie et Océanographie, Université de Bordeaux I, UMR CNRS 5805, Avenue des Facultés, 33405 Talence, France;2. Laboratoire d''Océanographie Biologique, Université de Bordeaux I, Avenue des Facultés, 33405 Talence, France;3. Centre de Formation et de Recherche sur l''Environnement Marin., Université de Perpignan, CNRS ERS 1745, Avenue de Villeneuve, 66860 Perpignan Cedex, France;1. Wroc?aw University of Environmental and Life Sciences, Institute of Environmental Engineering, 24 Grunwaldzki Sq., 50-363 Wroc?aw, Poland;2. Wroc?aw University of Environmental and Life Sciences, Institute of Environmental Protection and Development, 24 Grunwaldzki Sq., 50-363 Wroc?aw, Poland;3. Institute of Meteorology and Water Management – National Research Institute, Wroc?aw Branch, Parkowa Street 30, 51-616 Wroc?aw, Poland;1. CIGEOBIO-CONICET, Gabinete de Neotectónica, Facultad de Ciencias Exactas, Físicas & Naturales, Universidad Nacional de San Juan, Av. Ignacio de La Roza oeste 590, J5402DCS, San Juan, Argentina;2. Laboratorio de Geomorfología y Cuaternario, CADIC-CONICET, Bernardo Houssay 200, Ushuaia, c.p:9410, Tierra del Fuego, Argentina;3. Instituto de Ciencias Polares y Ambiente y Recursos Naturales, Universidad Nacional de Tierra del Fuego, Onas 450, Ushuaia, c.p:9410, Tierra del Fuego, Argentina;1. Limnology and Fisheries Laboratory, Centre of Research for Development (CORD), University of Kashmir, Srinagar, J & K, India;2. Division of Fisheries, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir (SKUAST-K), J & K, India;1. Department of Biology and Ecology, Faculty of Sciences and Mathematics, University of Ni?, Vi?egradska 33, 18000 Ni?, Serbia;2. College of Agriculture and Food Technology, Prokuplje, ?irila i Metodija 1, 18400 Prokuplje, Serbia;3. Institute of Botany and Botanical Garden Faculty of Biology, University of Belgrade, Takovska 43, 11000 Belgrade, Serbia |
| |
| Abstract: | During the ECOFER experiment (French ECOMARGE program), surficial sediments were sampled on the Aquitanian margin with box corers and analyzed to determine the quantity and quality of organic matter. Sediments from the margin are enriched in organic carbon (mean value 1.35%) in comparison to deep-sea and shelf sediments, due to a fine grain-size sedimentation. As sedimentation rates are high, the margin appears to be an organic depocenter. Some preferential organic enrichment zones were identified in the Cap-Ferret Canyon. There is a supply of continental material from the Gironde estuary, but marine contribution seems more possible than Adour or spanish rivers. No seasonal variations of organic matter were observed at the surface of sediments, suggesting mineralization processes of labile organic matter: average organic carbon consumption was evaluated to 9.0 g C m?2 yr?1. Rapid biological mineralization processes are lower than on the Mediterranean margin, mainly related to significant differences in water temperature. The great width of the canyon, its distance from the continent, and the current circulation pattern prevent any precise recording of the variable organic inputs to the sediment and favor nephelo??d transport, resuspension and shelf break processes, which wipe out any print of fresh material input. An organic carbon budget indicates that an equilibrium between organic inputs and organic mineralization+accumulation is not obtainable. The supply of suspended matter could have been minor during the year in question, and sedimentation rates are still imprecise. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
