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| Registros recuperados: 45 | |
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| Le Suave, Raymond; Bourillet, Jean-francois; Coutelle, Alain. |
| L’étude présentée ici s’inscrit dans la logique du programme de reconnaissance des zones économiques exclusives françaises initié par l’Ifremer vers la fin des années quatre-vingt. Elle est relative à la ZEE du golfe de Gascogne dont la reconnaissance a été achevée en 1997. Elle comporte un ensemble de documents cartographiques offrant une vision inédite de toute la partie nord du golfe et un texte, que les auteurs ont souhaité rendre accessible à la plus grande majorité, faisant état de connaissances générales sur la zone ainsi que de certains nouveaux apports. |
| Tipo: Text |
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| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00071/18199/15767.pdf |
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| Paquet, Fabien; Menier, David; Estournes, Guilhem; Bourillet, Jean-francois; Leroy, Pascal; Guillocheau, Francois. |
| High-resolution seismic data have been acquired in June 2008 on the Armorican Shelf (AS), in the northern Bay of Biscay, in order to reassess its stratigraphic architecture in detail and to study the impact of eustasy, tectonic and sediment delivery on the margin sedimentary record. Several profiles show fluvial-type incisions of several tens of meters (up to 54 m) associated to a widespread erosion surface. Several hypotheses are proposed for the stratigraphic position of this surface and incisions. We suggest Middle to Late Miocene age. Considering the relatively quiescent tectonic activity of the margin, we infer that the relative sea-level fall responsible of aerial incision on the Miocene shelf is eustasy-related. We propose the attested... |
| Tipo: Text |
Palavras-chave: Armorican Shelf; Incised valleys; Miocene; Eustasy; Passive margin. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00001/11200/8048.pdf |
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| Boavida, Joana; Becheler, Ronan; Choquet, Marvin; Frank, Norbert; Taviani, Marco; Bourillet, Jean-francois; Meistertzheim, Anne‐leila; Grehan, Anthony; Savini, Alessandra; Arnaud-haond, Sophie. |
| Aim To infer cold‐water corals’ (CWC) post‐glacial phylogeography and assess the role of Mediterranean Sea glacial refugia as origins for the recolonization of the northeastern Atlantic Ocean. Location Northeastern Atlantic Ocean and Mediterranean Sea. Taxon Lophelia pertusa, Madrepora oculata. Methods We sampled CWC using remotely operated vehicles and one sediment core for coral and sediment dating. We characterized spatial genetic patterns (microsatellites and a nuclear gene fragment) using networks, clustering and measures of genetic differentiation. Results Inferences from microsatellite and sequence data were congruent, and showed a contrast between the two CWC species. Populations of L. pertusa present a dominant pioneer haplotype, local haplotype... |
| Tipo: Text |
Palavras-chave: Cold-water corals; Deep-sea; Glacial marine refugia; Last Glacial Maximum; Lophelia pertusa; Madrepora oculata; Marine phylogeography. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00487/59864/63140.pdf |
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| De Chambure, Laurent; Bourillet, Jean-francois; Bartel, Claire. |
| Les coraux d’eau froide, contrairement aux coraux tropicaux, n’ont pas besoin de lumière et peuvent se développer en profondeur. Les espèces constructrices comme Lophelia pertusa et Madrepora occulata ont une distribution mondiale et sont présentes de la Norvège à la Grèce sous forme de monts carbonatés ou de récifs. Menacés par l’évolution des conditions environnementales et les actions anthropiques, les coraux d’eau froide sont actuellement classés comme écosystème vulnérable par plusieurs institutions internationales. Dans les eaux européennes, les indicateurs pour mesurer l’impact des pêcheries et l’efficacité des mesures de protection manquent encore. Le projet européen CoralFish vise à étudier l’interaction entre les coraux, les poissons et les... |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00249/36033/34570.pdf |
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| Ondreas, Helene; Olu, Karine; Fouquet, Yves; Charlou, Jean-luc; Gay, Aurelien; Dennielou, Bernard; Donval, Jean-pierre; Fifis, Alexis; Nadalig, Thierry; Cochonat, Pierre; Cauquil, E; Bourillet, Jean-francois; Le Moigne, Morgan; Sibuet, Myriam. |
| A giant, 800-m wide pockmark, called Regab, was discovered along the Equatorial African margin at 3160-m water depth and was explored by remote operated vehicle (ROV) as part of the Zaiango (1998-2000) and Biozaire (2001-2003) projects carried out conjointly by TOTAL and a number of French research institutes. A microbathymetric map obtained using the ROV sensors shows that the pockmark actually consists of a cluster of smaller pockmarks aligned N70 along a 15-m deep depression. Methane was recorded all over the pockmark, the highest values along the axis of the depression where massive carbonate crusts and dense seep communities were also found. Several faunal species belong to the Vesicomyidae and Mytilidae bivalve families, as well as to Siboglinidae... |
| Tipo: Text |
Palavras-chave: Gabon; Microbathymetric map; ROV; Exploration; Pockmark; Equatorial African margin. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-1239.pdf |
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| Bourillet, Jean-francois; Damy, Gilbert; Dussud, Loic; Sultan, Nabil; Woerther, Patrice; Migeon, Sebastien. |
| Various observations pointed out that cores performed with gravity piston corer show signifi cant distortions mainly located at the top of the core. A series of 15 cores were performed at the same location on a submarine sand wave (Var canyon, France). Six different settings of the corer – three freefall heights and three slacks of the piston cable – were tested, including duplicates. Two accelerometers recorded simultaneously the movements of the core tube and the movements of the triggering arm. Then the z displacements were obtained by a double integration versus time of the measured acceleration. The analyses of results allowed the authors to estimate the amplitude and the duration of the elastic recoil of the aramid cable, andto distinguish four steps... |
| Tipo: Text |
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| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/00071/18198/15766.pdf |
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| Van Den Beld, Inge; Bourillet, Jean-francois; Arnaud-haond, Sophie; De Chambure, Laurent; Davies, Jaime S; Guillaumont, Brigitte; Olu, Karine; Menot, Lenaick. |
| The topographical and hydrological complexity of submarine canyons, coupled with high substratum heterogeneity, make them ideal environments for cold-water coral (CWC) habitats. These habitats, including reefs, are thought to provide important functions for many organisms. The canyons incising the continental slope of the Bay of Biscay have distinct morphological differences from the north to the south. CWCs have been reported from this basin in the late 19th century; however, little is known about their present-day distribution, diversity and environmental drivers in the canyons. In this study, the characteristics and distribution of CWC habitats in the submarine canyons of the Bay of Biscay are investigated. Twenty-four canyons and three locations... |
| Tipo: Text |
Palavras-chave: Cold-water corals; Habitats; Submarine canyons; Bay of Biscay; NE Atlantic; ROV; Towed camera; Distribution. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00382/49343/49733.pdf |
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| Satra Le Bris, Catherine; Gautier, Emeric; Bourillet, Jean-francois. |
| Knowledge of the French continental shelf is heterogeneous : the bathymetry of the french EEZ is well known for the deeper domain but insufficient to establish a reference state on the continental shelf. Recopla consists of a modern continental shelf mapping project in cooperation with the oceanographic and hydrographic service of the French Navy. It will contribute to increase the knowledge necessary to establish reference data for the French/European marine strategy. The first task of the Recopla project consisted of an inventory of the geophysical data and metadata available on the French continental shelf, and a classification of these data according the level of processing : raw, processed, interpreted, published. Combining this information with the... |
| Tipo: Text |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00071/18234/15792.pdf |
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| Auffret, Gérard-andré; Zaragosi, S; Voisset, Michel; Droz, Laurence; Loubrieu, Benoit; Pelleau, Pascal; Savoye, R; Bourillet, Jean-francois; Baltzer, Agness; Bourquin, S; Dennielou, Bernard; Coutelle, Alain; Weber, N; Floch, Gilbert. |
| During the SEDIFAN 1 cruise we surveyed the bathymetry and the acoustic properties of the surface sediment of the Celtic Deep Sea Fan. We also collected Kullenberg cores in order to study recent sedimentary processes. From the bathymetry survey it is relatively easy to recognize the main areas of modern fan. The upper fan included a large sedimentary ridge which constitutes the right levee of the prominent meandering Whittard valley. After its confluence with the Shamrock valley the course of the Whittard valley is abruptly deflected to the south. At a short distance to the south the valley divides into two upper-fan channels, the Celtic channel to the west being the deeper one. This point constitutes the centre of a radiating pattern which is developed on... |
| Tipo: Text |
Palavras-chave: Paléoclimat; Turbidité; Sédiment; Quaternaire; Eventail profond; Palaeoclimate; Turbidity; Sediment; Quaternary; Deep sea fan. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/publication-525.pdf |
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| Naughton, F; Bourillet, Jean-francois; Fernanda, M; Turon, J; Jouanneau, J. |
| Vegetation and quantitative climate reconstructions from a northwestern France shelf core (VK0358Bis) show orbital and suborbital climate variability for the last 8850 years in this region. A long-term cooling trend in summer temperatures, marked by gradual temperate and humid forest decline, parallels cooling in Greenland and the decrease of mid-latitude summer insolation reduction until at least 2000 cal. yr BP. At the long-term scale, the lowering in seasonal contrast revealed by vegetation changes follows the increase of precession. Corylus woodlands spread at the expense of deciduous Quercus forest, between 8740 and 8390 cal. yr BP, linked with the high seasonality conditions that, counterbalancing the long-term astronomical forcing trend, were... |
| Tipo: Text |
Palavras-chave: Bay of Biscay; France; Europe; Vegetation; Marine core; Corylus; 8.2 kyr event; Millennial scale climate variability; Long term cooling; Holocene. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-4205.pdf |
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| Bourillet, Jean-francois; Zaragosi, S; Mulder, T. |
| The sedimentary infill of the Bay of Biscay off Ireland, UK, France and Spain took place in four phases. The last one (35 Ma to present) is characterised by gravitational, pelagic, contouritic and glacigenic processes leading to the setup of three deep sea systems. To the North, the Celtic and Armorican fans are fed by a "canyon-dominated" margin and its connection with the "Manche" palaeoriver, which drained a large area of western Europe. To the South, the Cap-Ferret fan results from the evolution of a "tectonic-dominated" margin and the erosion of the Pyrenee mountains. |
| Tipo: Text |
Palavras-chave: Sedimentology; Geomorphologya; Deep sea; Bay of Biscay; French Atlantic margin. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-2137.pdf |
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| Toucanne, Samuel; Zaragosi, S.; Eynaud, F.; Bourillet, Jean-francois; Lericolais, Gilles; Gibbard, P. L.. |
| Westaway and Bridgland (Earth Surface Processes and Landforms 35: 1071–1094, 2010) discuss the causes, the consequences and the chronology of large-magnitude palaeoflows in Pleistocene river systems of northwest Europe. Based on their calculations, these authors suggest that the combined effects of meltwater from Alpine glaciers, rainfall, snowmelt and melting of permafrost during Heinrich Events (HEs) explain the large-magnitude discharges of the Fleuve Manche palaeoriver which punctuated the last glacial period. This comment identifies some approximations and inconsistencies regarding (i) the timing of the last massive Fleuve Manche palaeoriver discharge and its relation to the de-glacial pattern of the British-Irish Ice Sheet (Point 1); (ii) the... |
| Tipo: Text |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00041/15205/12532.pdf |
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| Arnaud-haond, Sophie; Van Den Beld, Inge; Becheler, Ronan; Orejas, C.; Menot, Lenaick; Frank, N.; Grehan, A.; Bourillet, Jean-francois. |
| The scleractinian coral Lophelia pertusa has been the focus of deep-sea research since the recognition of the vast extent of coral reefs in North Atlantic waters two decades ago, long after their existence was mentioned by fishermen. These reefs where shown to provide habitat, concentrate biomass and act as feeding or nursery grounds for many species, including those targeted by commercial fisheries. Thus, the attention given to this cold-water coral (CWC) species from researchers and the wider public has increased. Consequently, new research programs triggered research to determine the full extent of the corals geographic distribution and ecological dynamics of “Lophelia reefs”. The present study is based on a systematic standardised sampling design to... |
| Tipo: Text |
Palavras-chave: Lophelia pertusa; Madrepora oculata; False-chimaera colonies; Cold water corals (CWC); Bay of Biscay; Ireland; Iceland. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00274/38530/37048.pdf |
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| Penaud, A.; Eynaud, F.; Turon, J. L.; Zaragosi, S.; Malaize, B.; Toucanne, Samuel; Bourillet, Jean-francois. |
| We present a new marine palynological record from the temperate North-eastern Atlantic (core MD03-2692, Celtic-Armorican margin) in the area of influence of the 'Fleuve Manche' paleoriver during glacial times. The runoff of this paleoriver was connected to the glacial history of European ice sheets (including the British Irish Ice Sheet-BIIS). Our study conducted on dinoflagellate cysts assemblages over the last 200 ka, associated with quantification of palynological remains reflecting continental influence (pre-Quaternary dinocysts and micro-algae Pediastrum spp. coenobia), yields detailed insights into the sea-surface paleoenvironments of this sector. More specifically, mechanisms responsible for the origin of unusual deposits of laminated sequences... |
| Tipo: Text |
Palavras-chave: Dinoflagellate cysts; European ice sheets; Celtic Armorican margin; MIS 2 and MIS 6; Terminations I and II. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00000/11116/8061.pdf |
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| Augris, Claude; Simplet, Laure; Maze, Jean-pierre; Morvan, Laetitia; Satra Le Bris, Catherine; Fitamant, Nadege; Bourillet, Jean-francois; Stephan, Michele. |
| Le présent rapport expose les résultats relatifs à ces trois phases. Une autre partie, préambule à la cinquième étape du projet, sera consacrée à la mise en forme des résultats et l’élaboration de la base de données sous Système d’Information Géographique pour les deux façades concernées « Manche-Est » et « Loire-Gironde ». Enfin, cinq cartes hors texte accompagnent ce rapport : · inventaire des ressources en matériaux marins, façade « Manche-Est » - Travaux réalisés (échelle 1/250 000, deux feuilles) ; · inventaire des ressources en matériaux marins, façade « Manche-Est » - Épaisseur des sédiments meubles (paléo-chenaux) (échelle 1/250 000, deux feuilles) ; · inventaire des ressources en matériaux marins, façade « Manche-Est » - Épaisseur des sédiments... |
| Tipo: Text |
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| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/00135/24577/22607.pdf |
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| Rabineau, Marina; Berne, Serge; Aslanian, Daniel; Olivet, Jean-louis; Joseph, Philippe; Guillocheau, François; Bourillet, Jean-francois; Le Drezen, Eliane; Granjeon, Didier. |
| The wide continental shelf of the Gulf of Lion (up to 70 km) has been the object of numerous investigations since the early days of oceanography. Yet, the question of sequences duration, the mechanisms of deposition and factors implied remained unanswered. A study of a very dense grid of Very High Resolution (VHR) seismic reflection (Sparker) data associated with surficial cores both, collected by IFREMER between 1992 and 2001 on the outer shelf and upper slope offshore of Sète in the Languedoc region gives a new insight into these issues. Analysis of the 3D geometry of the sedimentary record reveals a basic depositional pattern consisting of a pair of horizontally juxtaposed and downlapping prisms. Prism PI with low angle clinoforms (<1°) lies on the... |
| Tipo: Text |
Palavras-chave: Stratigraphic modelling; Cores; High resolution seismic data; Glacioeustatism; Climatic cycles; Gulf of Lion; Western Mediterranean. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-368.pdf |
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| Lericolais, Gilles; Auffret, J.p.; Bourillet, Jean-francois; Berne, Serge; Guennoc, Pol; Le Drezen, Eliane; Normand, Alain; Guillocheau, Francois. |
| New high resolution geophysical results from EM1000 swath-bathymetry system and Very High Resolution reflection seismic data are presented. A Neogene tectonical origin of the Hurd Deep and the interplay of erosion, sedimentation during the last glacial, inter-glacial periods are here argued by interpretation of these results in term of geomorphology and sequence stratigraphy. |
| Tipo: Text |
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| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/00071/18205/15772.pdf |
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| Mulder, Thierry; Cirac, Pierre; Gaudin, Mathieu; Bourillet, Jean-francois; Trainer, J.; Normand, Alain; Weber, O.; Griboulard, R.; Jouanneau, Jean-marie; Anschutz, Pierre; Jorissen, Frans. |
| Submarine canyons are narrow but deep submarine valleys that extend for hundreds of meters. They represent the most impressive structures that shape the present morphology of passive continental margins. They can occur off the mouth of rivers: the Tagus, Zaire, Amazon, and Orinoco in the Atlantic; the Indus in the Indian Ocean; and the Var, Rhone, and Ebro in the Mediterranean. Some are at times disconnected from any stream mouth such as the Nazare canyon, off Portugal, despite the fact that it is close to the coast. Some were connected to a river mouth during lowstands of sea level, such as the Wilmington canyon in the northwest Atlantic, or the Blackmud canyon in the northeast Atlantic. |
| Tipo: Text |
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| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/00071/18201/15769.pdf |
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| Bourillet, Jean-francois; De Chambure, Laurent; Loubrieu, Benoit. |
| Les coraux d’eau froide, contrairement aux coraux tropicaux, n’ont pas besoin de lumière et peuvent se développer en profondeur. Les espèces constructrices comme Lophelia pertusa et Madrepora occulata ont une distribution mondiale et sont présentes de la Norvège à la Grèce sous forme de monts carbonatés ou de récifs. Menacés par l’évolution des conditions environnementales et les actions anthropiques, les coraux d’eau froide sont actuellement classés comme écosystème vulnérable par plusieurs institutions internationales. Dans les eaux européennes, les indicateurs pour mesurer l’impact des pêcheries et l’efficacité des mesures de protection manquent encore. Le projet européen CoralFISH vise à étudier l’interaction entre les coraux, les poissons et les... |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00320/43162/42719.pdf |
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| Registros recuperados: 45 | |
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