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125000 ans d'enregistrements récifaux des stagnations du niveau de la mer dans l'Océan Indien (Archipel des Glorieuses) ArchiMer
Jorry, Stephan; Jouet, Gwenael; Le Roy, Pascal; Prat, Sophie; Camoin, Gilbert; Vella, Claude; Caline, Bruno.
Suite à l’initiation du programme REEFCORES (REEFs and CORals form the EparseS), deux missions menées en 2011 et en 2013 dans l’Archipel des Glorieuses (Nord Madagascar) ont permis de documenter les empreintes des épisodes de déglaciation dans la morphologie des terrasses récifales émergées et submergées. L’objectif principal de cette étude est d’abord de documenter les stagnations du niveau marin qui ont été engendrées au cours de la dernière remontée du niveau marin et sur les terrasses du dernier interglaciaire (MIS 5e). Cette zone située autour des Seychelles, du fait de sa stabilité (isostasie très faible), est idéalement placée pour reconstituer avec précision les variations globales du niveau marin (Milne and Mitrovica, 2008). Des données de...
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00202/31279/29686.pdf
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Géomorphologie et sédimentologie d'une plate-forme carbonatée isolée: l'Archipel des Glorieuses, SO Océan Indien ArchiMer
Prat, Sophie; Jorry, Stephan; Jouet, Gwenael; Le Roy, Pascal; Camoin, Gilbert; Vella, Claude; Caline, Bruno.
Améliorer nos connaissances sur la distribution des sédiments carbonatés dans les systèmes récifaux actuels sert à définir des analogues afin de mieux comprendre les réservoirs à hydrocarbures exploités dans les formations récifales fossiles. Bien que le rôle des changements du niveau marin, de la tectonique et de la sédimentation sur la dynamique et l'évolution des plates-formes carbonatés tropicales ait été largement étudié, la variabilité sédimentaire et les facteurs qui contrôlent cette hétérogénéité sont moins bien connus. Quelques études illustrent bien cette répartition des sédiments au sein des plates-formes carbonatées actuelles (Purdy et Gischler, 2003; Thudhope et al., 1985; Maxwell, 1973), mais il existe peu de cas étudiés dans l'océan Indien....
Tipo: Text
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00202/31281/29688.pdf
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Geomorphology and sedimentology of a modern isolated carbonate platform: The glorieuses archipelago, SW Indian Ocean ArchiMer
Prat, Sophie; Jorry, Stephan; Jouet, Gwenael; Camoin, Gilbert; Vella, Claude; Le Roy, Pascal; Caline, Bruno; Boichard, Robert; Pastol, Yves.
The study of modern carbonate systems is commonly helps in improving facies interpretation in fossil reefs and in providing analogues of sediment distribution depending on the specific platform configuration (i.e. rimmed shelves and isolated carbonate platforms). This paper deals with a geomorphological and sedimentological study of the Glorieuses Archipelago, an isolated carbonate platform located between the northern tip of Madagascar and Mayotte. The dataset consists of Digital Terrain Model, satellite imagery, and box-sediment samples. Analyses of grain-size and composition of carbonate grains are used to characterize the distribution and heterogeneity of sediment accumulated on the isolated platform. Main results show that the Glorieuses Archipelago...
Tipo: Text Palavras-chave: Carbonate platform; Modern coral reefs; Pleistocene fossil reefs; Sandwaves.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00326/43761/43318.pdf
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Modern sediments and Pleistocene reefs from isolated carbonate platforms (Iles Eparses, SW Indian Ocean): A preliminary study ArchiMer
Jorry, Stephan; Camoin, Gilbert F.; Jouet, Gwenael; Le Roy, Pascal; Vella, Claude; Courgeon, Simon; Prat, Sophie; Fontanier, Christophe; Paumard, Victorien; Boulle, Julien; Caline, Bruno; Borgomano, Jean.
Isolated carbonate platforms occur throughout the geologic record, from Archean to present. Although the respective roles of tectonics, sediment supply and sea-level changes in the stratigraphical architecture of these systems are relatively well constrained, the details of the nature and controls on the variability of sedimentological patterns between and within individual geomorphologic units on platforms have been barely investigated. This study aims at describing and comparing geomorphological and sedimentological features of surficial sediments and fossil reefs from three isolated carbonate platforms located in the SW Indian Ocean (Glorieuses, Juan de Nova and Europa). These carbonate platforms are relatively small and lack continuous reef margins,...
Tipo: Text Palavras-chave: Mozambique channel; Carbonate sediments; Fossil reefs; Isolated carbonate platforms.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00292/40329/39074.pdf
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Morphological changes and sedimentary processes induced by the December 2003 flood event at the present mouth of the Grand Rhone River (southern France) ArchiMer
Maillet, Grégoire M.; Vella, Claude; Berne, Serge; Friend, Patrick L.; Amos, Carl L.; Fleury, Thomas J.; Normand, Alain.
The study, which is based on repetitive bathymetric surveys, assesses changes and effects of one of the most important floods recorded in the Rhone Delta area: bottom morphology and sediment distribution in the Rhone outlet after the December 2003 flood are discussed by comparison between Digital Terrain maps (DTMs) of November 2003 and January 2004. The post-flood morphology shows that the whole of the system is active, mainly in the east. The channel of the Rhbne has been hollowed out on the left bank by more than 5 m, the eastern coast of the mouth has retreated 400 m, the mouth-bar has prograded 200 m and the slope of the delta front has increased by 0.19. The overlay of pre- and post-flood DTMs makes it possible to estimate the total volume deposited...
Tipo: Text Palavras-chave: Bathymetric maps; Sedimentation rate; Flood processes; Prodelta; Delta front; Mouth bar.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2304.pdf
Registros recuperados: 5
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