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Registros recuperados: 11
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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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Cenozoic tectonics of the Western Approaches Channel basins and its control of local drainage systems ArchiMer
Le Roy, Pascal; Gracia-garay, Claire; Guennoc, Pol; Bourillet, Jean-francois; Reynaud, Jean-yves; Thinon, Isabelle; Kervevan, Patrick; Paquet, Fabien; Menier, David; Bulois, Cedric.
The geology of the Channel Western Approaches is a key to understand the post-rift evolution of the NW European continental margin in relation with the Europe/Africa collision. Despite considerable evidence of Tertiary tectonic inversion throughout the Channel basin, the structures and amplitudes of the tectonic movements remain poorly documented across the French sector of the Western Approaches. The effect of the tectonic inversion for the evolution of the "Channel River", the major system that flowed into the English Channel during the Plio-Quaternary eustatic lowstands, also needs to be clarified. Its drainage basin was larger than the present-day English Channel and constituted the source of terrigenous fluxes of the Armorican and Celtic deep sea...
Tipo: Text Palavras-chave: English Channel; Western Approaches basins; Cenozoic; Palaeovalley; Seismic stratigraphy; Tectonic inversion.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00056/16706/15776.pdf
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Control factors of Holocene sedimentary infilling in a semi-closed tidal estuarine-like system: the bay of Brest (France) ArchiMer
Gregoire, Gwendoline; Le Roy, Pascal; Ehrhold, Axel; Jouet, Gwenael; Garlan, Thierry.
This study details the sedimentary infilling of an original tidal-dominated estuary system during the final stage of the last marine transgression. The Bay of Brest is confined and connects the rivers Elorn and Aulne, to the sea of Iroise by a narrow strait encasing a well preserved paleo-channel. The compilation of high- and very-high-resolution bathymetric and seismic data, constrained by sediments datations, allows us to classify the paleo-morphology of the bay into three stepped domains: the paleo-valley floor surrounded by fluvial terraces, the central plateau, and the shallow embayments. Taking into account the main factors controlling the infilling, including sea-level rise, substratum morphology, and hydrodynamics, the stratigraphic scheme of the...
Tipo: Text Palavras-chave: Tide-dominated estuary; Incised-valley; Holocene infill; Seismic stratigraphy; Estuarine processes; Bay of Brest.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00358/46968/46883.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....
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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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Influence des facteurs hydrodynamiques sur la répartition et l'évolution morpho-sédimentaire : exemple de la Rade de Brest (Finistère) ArchiMer
Gregoire, Gwendoline; Ehrhold, Axel; Jouet, Gwenael; Augris, Claude; Simplet, Laure; Le Roy, Pascal; Garlan, Thierry.
Tipo: Text
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00285/39614/38108.pdf
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Late Pleistocene evolution of the mixed siliciclastic and carbonate southwestern New Caledonia continental shelf/lagoon ArchiMer
Le Roy, Pascal; Jorry, Stephan; Jouet, Gwenael; Ehrhold, Axel; Michel, Guillaume; Gautier, Valentin; Guerin, Charline.
The main island of New Caledonia (NC) is surrounded by the second largest barrier reef in the world after the Australian Great Barrier Reef. The Upper Pleistocene evolution of this barrier reef–lagoon complex offers the opportunity to examine the response of a modern mixed tropical siliciclastic/carbonate system to relative sea-level changes and to better constrain the relative role of lagoon backfilling and paleo-drainage system in sediment transfer across the shelf. This paper mainly focuses on the results of chronostratigraphic and sedimentological interpretations of new seismic, bathymetric and coring data collected in the SW NC lagoon. Several significant points are highlighted from this study and allow the construction of a refined model which...
Tipo: Text Palavras-chave: Seismic stratigraphy; Quaternary; Incised valleys.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00461/57289/59362.pdf
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Les facteurs de contrôle du remplissage Holocène dans un système estuarien dominé marée : La rade de Brest (Bretagne) ArchiMer
Gregoire, Gwendoline; Le Roy, Pascal; Ehrhold, Axel; Jouet, Gwenael; Garlan, Thierry.
Tipo: Text
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00363/47412/47412.pdf
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Modern morpho-sedimentological patterns in a tide-dominated estuary system: the Bay of Brest (west Britanny, France) ArchiMer
Gregoire, Gwendoline; Ehrhold, Axel; Le Roy, Pascal; Jouet, Gwenael; Garlan, Thierry.
Long-studied with respect to its sedimentological features (1897), the Bay of Brest (Western Britanny, France) is a textbook example of a tide-dominated estuary. Characterised by macrotidal conditions, this estuary system is sheltered from the open sea (Iroise Sea) by a narrow strait that partitions the wave tide influences and continental/marine inputs. Sediments are supplied to the bay both by rivers (the Aulne and Elorn rivers) and by marine tidal currents. This study presents new analyses of detailed facies and morphological patterns, based on the integration of multisource data compiling seabed sampling, swath and LIDAR bathymetry, and backscatter imagery. The Main Map, at a scale of 1:90,000, contains (1) a sedimentological distribution using the...
Tipo: Text Palavras-chave: Morpho-sedimentological cartography; Tide-dominated; Estuary system; Estuarine sedimentation; Backscatter imagery; Bay of Brest.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00334/44492/44224.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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Searching for the Africa-Eurasia Miocene boundary offshore western Algeria (MARADJA'03 cruise) ArchiMer
Domzig, Anne; Yelles, Karim; Le Roy, Charlotte; Deverchere, Jacques; Bouillin, Jean-pierre; Bracene, Rabah; De Lepinay, Bernard Mercier; Le Roy, Pascal; Calais, Eric; Kherroubi, Abdelaziz; Gaullier, Virginie; Savoye, Bruno; Pauc, Henri.
We present new results from the MARADJA'03 cruise depicting the geological structures offshore central and western Algeria. Using swath bathymetry and seismic reflection data, we map and discuss the offshore limits of the Internal Zones corresponding to relics of the AIKaPeCa domain that drifted and collided the African plate during the Miocene. We identify large reverse faults and folds that reactivate part of these limits and are still active today. The morphology of the westernmost NE-SW margin suggests a former strike-slip activity accommodating a westward block translation responsible for the shift of the Internal Zones towards the Moroccan Rif.
Tipo: Text Palavras-chave: Sismique réflexion; Bathymétrie multifaisceau; Évolution tectonique du Bassin méditerranéen; Néotectonique; Zones Internes; Marge Algérienne; Seismic reflection; Swath bathymetry; Tectonic evolution of the Mediterranean; Internal zones neotectonics; Algerian margin.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1211.pdf
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