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Distribution des formations superficielles intertidales de l'archipel de Chausey (Manche).
| Content Provider | Semantic Scholar |
|---|---|
| Author | Fournier, Jérôme Godet, Laurent Bonnot-Courtois, Chantal Baltzer, Agnès Caline, Bruno Vot, Monique Le |
| Copyright Year | 2009 |
| Abstract | The distribution of the superficial sedimentary deposits of the Chausey archipelago has been studied by means of grain size and carbonate content analysis on subtidal and intertidal facies. The landform analysis of intertidal and shallow-water areas was achieved using a combination of a mosaic of aerial photographs and side-scan sonar data. This study was part of the French National Coastal Environment Program (PNEC) which was conducted from 2004 to 2007. The extreme tidal regime of the study area, which has 14 m tidal range during high spring tides, induces strong tidal currents. The intertidal sedimentary deposits have a complex distribution linked to the wide range geomorphological diversity of the small islands. The subtidal zone shows various bedforms between 5 and 15 m water depths. The archipelago is characterized by numerous rocky outcrops and very coarse sediments widely distributed over the mapped area; this abrasion platform is submitted under very high hydrodynamic conditions and consequently has a poorly developed sedimentary prism. Two systems of deposit occurs: the first one, located in the western part of the archipelago, is proximal and terrigeneous whereas the other one, dominating the eastern part of Chausey, is distal and has a high carbonate content. The Chausey carbonate production is extremely abundant given its temperate 5 GÉOLOGIE DE LA FRANCE, N° 1, 2009 Distribution des formations superficielles intertidales de l’archipel de Chausey (Manche) Intertidal sediment distribution of the Chausey archipelago (The Channel, France) Jérôme Fournier* (1) Laurent Godet (1) Chantal Bonnot-Courtois (2) Agnès Baltzer (3) Bruno Caline (4) Géologie de la France, n° 1, 2009, p. 5-17, 6 fig. Mots-clés : Sédiment marin, Milieu littoral, Figures sédimentaires, Archipel de Chausey, Manche. Key word: Marine sediment, Nearshore environment, Sedimentary features, Chausey Archipelago, English channel. (1) CNRS, UMR 7208 BOREA, CRESCO MNHN, 38 rue du Port-Blanc, 35801 Dinard cedex (2) CNRS, UMR 8586 PRODIG, Laboratoire de Géomorphologie et Environnement littoral EPHE, 15 boulevard de la mer, 35800 Dinard (3) Université de Caen Basse-Normandie, UMR 6143, M2C 2-4 rue des tilleuls, 14000 Caen (4) TOTAL, CSTJF, Carbonate & Sedimentology Group, BA2083, av. Larribau, 64018 Pau cedex *Auteur pour correspondance Corresponding author: fournier@mnhn.fr environment and the presence of intertidal benthic communities that may play an active role in the sedimentation such as seagrass meadows (Zostera marina) or worm bioherms (Lanice conchilega). |
| Starting Page | 5 |
| Ending Page | 17 |
| Page Count | 13 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://laurentgodetpagepersonnelle.a.l.f.unblog.fr/files/2010/01/fournieretal2009geolfrance.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
