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Registros recuperados: 20
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Environmental Hf–Nd isotopic decoupling in World river clays ArchiMer
Bayon, Germain; Skonieczny, Charlotte; Delvigne, Camille; Toucanne, Samuel; Bermell, Sylvain; Ponzevera, Emmanuel; Andre, Luc.
The hafnium and neodymium radiogenic isotope systems behave differently during Earth surface processes, causing a wide dispersion of Hf and Nd isotopic compositions in sediments and other sedimentary rocks. The decoupling between Hf and Nd isotopes in sediments is generally attributed to a combination of preferential sorting of zircon during sediment transport and incongruent weathering processes on continents. In this study, we analysed size-fractions of sediment samples collected near the mouth of 53 rivers worldwide to better understand the factors controlling the distribution of Hf and Nd isotopes in sediments. Our results for rivers draining old cratonic areas and volcanic provinces demonstrate that both granite and basalt weathering can lead to...
Tipo: Text Palavras-chave: Hafnium isotopes; Neodymium; Rivers; Clays; Weathering; Climate.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00310/42094/41479.pdf
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Extensive wet episodes in Late Glacial Australia resulting from high-latitude forcings ArchiMer
Bayon, Germain; De Deckker, Patrick; Magee, John W.; Germain, Yoan; Bermell, Sylvain; Tachikawa, Kazuyo; Norman, Marc D..
Millennial-scale cooling events termed Heinrich Stadials punctuated Northern Hemisphere climate during the last glacial period. Latitudinal shifts of the intertropical convergence zone (ITCZ) are thought to have rapidly propagated these abrupt climatic signals southward, influencing the evolution of Southern Hemisphere climates and contributing to major reorganisation of the global ocean-atmosphere system. Here, we use neodymium isotopes from a marine sediment core to reconstruct the hydroclimatic evolution of subtropical Australia between 90 to 20 thousand years ago. We find a strong correlation between our sediment provenance proxy data and records for western Pacific tropical precipitations and Australian palaeolakes, which indicates that Northern...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00375/48585/48906.pdf
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Identification des pecheries cotieres bretonnes et des problemes d'amenagement ArchiMer
Talidec, Catherine; Berthou, Patrick; Rivoalen, Jean-jacques; Bermell, Sylvain; Guillaumont, Brigitte.
The study undertaken during the 1994-1998 planning contract on the Breton fishing fleet made it possible to underscore the size of the economic activity in regional territorial waters: More than 85% of the ships work there. This space, which is a matter of national sovereignty, is mainly managed at the regional level. To clarify the paths that may need to be taken, it seemed opportune to us to identify spatially the coastal fisheries, as well as the main current problems of planning. The fishing zones were mapped. This work required special surveys of the local fishing committees, because it could not be done from existing fishing statistics. The surveys allowed us to approach the localization of the various trades' fishing zones on maps at 1/50,000, as...
Tipo: Text Palavras-chave: Fishing regulation; Territorial waters; Cartography; Survey; Fleet; Fisheries; Brittany; Réglementation; Enquêtes; Zones de pêche; Cartographie; Gisements naturels; Eaux territoriales; Flotte; Pêche bretonne; CPER.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/2000/rapport-2256.pdf
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Intensifying Weathering and Land Use in Iron Age Central Africa ArchiMer
Bayon, Germain; Dennielou, Bernard; Etoubleau, Joel; Ponzevera, Emmanuel; Toucanne, Samuel; Bermell, Sylvain.
About 3000 years ago, a major vegetation change occurred in Central Africa, when rainforest trees were abruptly replaced by savannas. The consensus is that the forest disturbance was caused by climate change. We show here that chemical weathering in Central Africa, reconstructed from geochemical analyses of a marine sediment core, intensified abruptly at the same period, departing significantly from the long-term weathering fluctuations related to the Late Quaternary climate. Evidence that this weathering event was also contemporaneous with the migration of Bantu-speaking farmers across Central Africa suggests that human land-use intensification at that time already had a significant impact on the rainforest.
Tipo: Text
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00069/18031/15574.pdf
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Major modification of sediment routing by a large Mass Transport Deposit in the Gulf of Lions (Western Mediterranean) ArchiMer
Dennielou, Bernard; Jegou, I.; Droz, Laurence; Jouet, Gwenael; Cattaneo, Antonio; Berné, Serge; Aslanian, Daniel; Loubrieu, Benoit; Rabineau, Marina; Bermell, Sylvain.
In the Gulf of Lions (Western Mediterranean), the emplacement of a large (160 km3) Mass Transport Deposit, the Rhone Western Mass Transport Deposit (RWMTD), at the base of slope, aside the Rhone deep-sea fan between 1800 and 2700 m water depth, resulted in a major modification of the sediment routing by clogging a drainage network and blocking at the base of slope sediments that were previously routed into the Valencia channel and the Balearic abyssal plain. The RWMTD was sourced from sediments of the western flank of the Rhone upper fan and the adjacent base of slope. The mass transport deposit is characterized by a transparent seismic facies and sediment cores show that it is composed of a stiff laminated muddy lithofacies characteristic of the Rhone fan...
Tipo: Text Palavras-chave: Gulf of Lions; Ebro margin; Sediment routing; Rhone deep-sea fan; Canyon; Mass transport deposit; Turbidite.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00480/59175/61813.pdf
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Origin of an enigmatic regional Mio-Pliocene unconformity on the Demerara plateau ArchiMer
Pattier, France; Loncke, L.; Imbert, Patrice; Gaullier, V.; Basile, C.; Maillard, Alexandre; Roest, Walter; Patriat, Martin; Vendeville, B. C.; Marsset, Tania; Bayon, Germain; Cathalot, Cecile; Caprais, Jean-claude; Bermell, Sylvain; Sotin, Christine; Hebert, Bertil; Mercier De Lepinay, Marion; Lebrun, J. F.; Marcaillou, B.; Heuret, A.; Droz, Laurence; Graindorge, David; Poetisi, E.; Berrenstein, H..
The Demerara plateau, located offshore French Guiana and Suriname, is part of a passive transform continental margin particularly prone to develop slope instabilities, probably in relation to the presence of a free distal border along its steep continental slope. Slope failure occurred at different periods (Cretaceous to Neogene) and shows an overall retrogressive evolution through time. Upslope these failure headscarp, an enigmatic regional MioPliocene unconformity has been discovered through the interpretation of new academic and industrial datasets. The aim of this work is to describe and understand the origin of this surface. Our analysis shows that this unconformity is made of a series of valleys that cross-cut sedimentary strata. Each one of these...
Tipo: Text Palavras-chave: Unconformity; Hydrate pockmark; Slide; Contourite; Valley; Canyon; Demerara plateau.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00271/38193/36735.pdf
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Rare earth elements and neodymium isotopes in sedimentary organic matter ArchiMer
Freslon, Nicolas; Bayon, Germain; Toucanne, Samuel; Bermell, Sylvain; Bollinger, Claire; Chéron, Sandrine; Etoubleau, Joel; Germain, Yoan; Khripounoff, Alexis; Ponzevera, Emmanuel; Rouget, Marie Laure.
We report rare earth element (REE) and neodymium (Nd) isotope data for the organic fraction of sediments collected from various depositional environments, i.e. rivers (n=25), estuaries (n=18), open-ocean settings (n=15), and cold seeps (n=12). Sedimentary Organic Matter (SOM) was extracted using a mixed hydrogen peroxide/nitric acid solution (20%-H2O2 – 0.02M-HNO3), after removal of carbonate and oxy-hydroxide phases with dilute hydrochloric acid (0.25M-HCl). A series of experimental tests indicate that extraction of sedimentary organic compounds using H202 may be complicated occasionally by partial dissolution of sulphide minerals and residual carbonates. However, this contamination is expected to be minor for REE because measured concentrations in H2O2...
Tipo: Text Palavras-chave: Organic matter; Rare earth elements; REE; Neodymium isotopes; ΕNd; Sediment; Boundary Exchange; Paleoceanography.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00191/30250/28682.pdf
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Rare earth elements and neodymium isotopes in world river sediments revisited ArchiMer
Bayon, Germain; Toucanne, Samuel; Skonieczny, Charlotte; Andre, L.; Bermell, Sylvain; Cheron, Sandrine; Dennielou, Bernard; Etoubleau, Joel; Freslon, Nicolas; Gauchery, T.; Germain, Yoan; Jorry, Stephan; Menot, G.; Monin, L.; Ponzevera, Emmanuel; Rouget, M. -l.; Tachikawa, K.; Barrat, Jean-alix.
Over the past decades, rare earth elements (REE) and their radioactive isotopes have received tremendous attention in sedimentary geochemistry, as tracers for the geological history of the continental crust and provenance studies. In this study, we report on elemental concentrations and neodymium (Nd) isotopic compositions for a large number of sediments collected near the mouth of rivers worldwide, including some of the world’s major rivers. Sediments were leached for removal of non-detrital components, and both clay and silt fractions were retained for separate geochemical analyses. Our aim was to re-examine, at the scale of a large systematic survey, whether or not REE and Nd isotopes could be fractionated during Earth surface processes. Our results...
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00276/38733/37249.pdf
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Response to Comments on "Intensifying Weathering and Land Use in Iron Age Central Africa" ArchiMer
Bayon, Germain; Dennielou, Bernard; Etoubleau, Joel; Ponzevera, Emmanuel; Toucanne, Samuel; Bermell, Sylvain.
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00092/20327/18004.pdf
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Saisie des métadonnées sous ArcGIS 10.1. Selon les normes et standards d'interopérabilité ISO 19115 et ISO 19139, et exportation vers Sextant Version 5 – Version 5 de Sextant – Interface GeoNetwork (Version 2.10). ArchiMer
Boisson, Edith; Lamirault-gall, Marie-odile; Pitel-roudaut, Mathilde; Manceau, Sophie; Bermell, Sylvain.
Ce document explique la saisie des métadonnées sous ArcGIS 10.1, selon les normes et standards d'interopérabilité ISO 19115 et ISO 19139 et compatibles à la Directive européenne INSPIRE. Il présente également une méthode d'exportation en fichier XML et l'intégration de ce fichier dans le serveur de données géographiques Sextant.
Tipo: Text Palavras-chave: ArcGIS 10.1; ArcCatalog; Sextant; Norme ISO; Directive européenne INSPIRE; Information géographique; Métadonnées.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00186/29678/28052.pdf
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Scénarios d'aménagement des activités de pêche dans la bande cotière bretonne, rapport 2002 ArchiMer
Talidec, Catherine; Berthou, Patrick; Peronnet, Isabelle; Guyader, Olivier; Daures, Fabienne; Thebaud, Olivier; Leblond, Emilie; Bermell, Sylvain.
This 2002 report is the progress report of a study co-financed by the Brittany region and IFREMER within the framework of the XII State-Regional Planning Contract. It follows the 2001 report, which contains a comprehensive description of the Breton fleet in 2000, i.e., all occupations included, as well as its evolution since 1983. The work carried out in 2002 focused on mapping the fishing zones frequented by Brittany's ships as well as on analysing fishing strategies.
Tipo: Text Palavras-chave: Fishing gear; Regional development; Cartography; Fleet; Breton fisheries; Brittany; Cartographie; CPER 2002; Peche bretonne; Flotte; Casier; Ligne; Drague; Palangre; Filet; Chalut.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/rapport-2259.pdf
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Sextant : Guide de saisie des métadonnées selon les normes et standards d'interopérabilité ISO 19115 et ISO 19139, dans l'interface GeoNetwork (version 2.0.1 personnalisée Ifremer)-Version 1.0 ArchiMer
Lamirault-gall, Marie-odile; Rollet, Claire; Satra Le Bris, Catherine; Bermell, Sylvain; Laffay, Etienne; Lecuy, Fanny; Quimbert, Erwann; Pitel-roudaut, Mathilde.
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00025/13671/10884.pdf
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Sextant : Guide de saisie des métadonnées selon les normes et standards d'interopérabilité ISO 19115 et ISO 19139, et en conformité avec la directive INSPIRE Version 4 de Sextant - interface GeoNetwork (Version 2.6.1.0) ArchiMer
Lamirault-gall, Marie-odile; Rollet, Claire; Satra Le Bris, Catherine; Bermell, Sylvain; Laffay, Etienne; Lecuy, Fanny; Quimbert, Erwann; Pitel-roudaut, Mathilde.
Ce document présente comment saisir les métadonnées, compatibles à la norme ISO 19115 et à la Directive européenne INSPIRE, dans le serveur de données géographiques Sextant. L'approche de ce guide se veut pragmatique c'est-à-dire que la présentation des différents éléments se fait selon leur apparition dans l'ordre des onglets au niveau de la Vue avancée.
Tipo: Text Palavras-chave: Sextant; Norme ISO; Information géographique; Métadonnées; INSPIRE.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00054/16516/14038.pdf
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Structure of the Demerara passive-transform margin and associated sedimentary processes. Initial results from the IGUANES cruise ArchiMer
Loncke, L.; Maillard, A.; Basile, C.; Roest, Walter; Bayon, Germain; Gaullier, V.; Pattier, France; Mercier De Lépinay, Marion; Grall, Celine; Droz, L.; Marsset, Tania; Giresse, P.; Caprais, Jean-claude; Cathalot, Cecile; Graindorge, D.; Heuret, A.; Lebrun, J. F.; Bermell, Sylvain; Marcaillou, B.; Sotin, C.; Hebert, B.; Patriat, Martin; Bassetti, M. A.; Tallobre, Cedric; Buscail, R.; Durrieu De Madron, X.; Bourrin, F..
he IGUANES cruise took place in May 2013 on the R/V L'Atalante along the Demerara passive transform margin off French Guiana and Surinam. Seismic, multibeam and chirp acquisitions were made. Piston cores were collected for pore geochemistry and sedimentology. A mooring was deployed on the sea-bottom for 10 months (temperature, salinity, turbidity and current measurements). This new dataset highlights the lateral variability of the 350 km-long Guiana–Surinam transform margin due to the presence of a releasing bend between two transform segments. The adjacent Demerara Plateau is affected by a 350 km-long giant slide complex. This complex initiated in Cretaceous times and was regularly reactivated until recent times. Since the Miocene, contourite processes...
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Ano: 2016 URL: http://archimer.ifremer.fr/doc/00428/53942/55285.pdf
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Synthèse des Flottilles de Pêche 2003. Flotte Mer du Nord - Manche - Atlantique ArchiMer
Leblond, Emilie; Daures, Fabienne; Berthou, Patrick; Bermell, Sylvain; Merrien, Claude; Demaneche, Sébastien.
The document synthesizes the data collected in 2004 as part of the Fisheries Observatory of Ifremer. It updates the description of the status in 2002 of the French fishing fleets operating in the North Sea, Channel and Atlantic (published in 2003). The document is comprised of a series of leaflets. The first leaflet provides a detailed breakdown of the fishing fleet. Information provided includes vessel and crew characteristics, spatial distribution of fishing activity and catch, and gear used. A description of fleets (sub-groups of vessels using the same gear combination) is also provided at both national and regional levels. The following leaflets provide a detailed description of the fishing activity and economic status of each coast (the North Sea...
Tipo: Text Palavras-chave: France; Atlantique; Manche; Mer du Nord; Indicateurs économiques; Indicateurs d'activité; Engin; Métier; Flottille; Typologies; Pêche; France; Atlantic; Channel; North Sea; Economic indicators; Indicators of fishing activity; Gear; Metier; Fishing fleet; Typologies; Fishing sector.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/rapport-1227.pdf
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Synthèse des flottilles de pêche 2004 - Mer du Nord, Manche, Atlantique ArchiMer
Leblond, Emilie; Daures, Fabienne; Berthou, Patrick; Bermell, Sylvain; Jezequel, Michele; Merrien, Claude.
This summary reports on the characteristics of the French flotillas according to trade; allocation of ships by region; spatial distribution of the activity; average economic indicators; technical characteristics of the ships...
Tipo: Text Palavras-chave: North Sea; Channel; Metier; Fishing gear; Ship size; Atlantic ocean; French fishing fleet; Indicateur économique; Metiers; Engins de pêche; Tailles des navires; Mer du Nord; Manche; Atlantique; Flottille française.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/rapport-2631.pdf
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Synthèse des flottilles de pêche 2005 - Flotte Mer du Nord-Manche-Atlantique ArchiMer
Leblond, Emilie; Daures, Fabienne; Berthou, Patrick; Bermell, Sylvain; Merrien, Claude; Planchot, Marie; Demaneche, Sébastien; Brigaudeau, Cécile.
This description of the French fishing fleets of the North Sea/English Channel/Atlantic for the year 2005 was done in the context of IFREMER's programme, "Information systems and observation techniques, economy and diagnostics of the evolution of resources and their use". This programme brings together projects that have ambitions specific to each. The "Fisheries Information Systems" (FIS) project constitutes the operational and multidisciplinary fisheries observatory. In addition to support for halieutic research programmes and halieutic advisory and experts' missions, the FIS project has as its mission the development of integrated indicators on fisheries and summaries meant for the various actors of the fishing sector (from researchers to the fishermen...
Tipo: Text Palavras-chave: Fisheries Information system fishing strategy cartography fishing zones fishing gear metier hooker potter netter seiner dredger trawler Atlantic Ocean North Sea Channel French fishing fleet Atlantique Manche; Mer du Nord flottille de pêche stratégie de pêche cartographie zones de pêche métier engin SIH ligneur caseyeur fileyeur tamiseur bolincheur dragueur chalutier.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/rapport-2579.pdf
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Synthèse des flottilles de pêche 2006 - Flotte Mer du Nord - Manche - Atlantique - Méditerranée ArchiMer
Leblond, Emilie; Daures, Fabienne; Berthou, Patrick; Merrien, Claude; Pitel-roudaut, Mathilde; Bermell, Sylvain; Brigaudeau, Cecile; Planchot, Marie; Demaneche, Sebastien; Jezequel, Michele; Bodere, Erwan.
This document, which is the fifth edition of a series started in 2000, provides a global overview of the data collected in 2007 as part of the Fisheries Observatory of Ifremer. It includes a brief account of the activity and financial situation of the French fleets operating in the North Sea, English Channel, Northeast Atlantic and Mediterranean Sea in 2006 and updates the 2005 issue, which was published in 2006. The summary is intended for a wide audience. The document contains several fact sheets : • The first sheet provides a global description of the French national (excluding overseas) fishing fleet (North Sea - Channel, Atlantic and Mediterranean Sea), including vessel and crew characteristics. It also presents the evolution of the French fishing...
Tipo: Text Palavras-chave: Pêche; Typologies; Flottille; Métier; Engin; Indicateurs d’activité; Indicateurs économiques; Mer du Nord; Manche; Atlantique; Méditerranée; France; Fishing sector; Typologies; Fishing fleet; Métier; Gear; Indicators of fishing activity; Economic indicators; North Sea; English Channel; Atlantic; Mediterranean Sea; France.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/00042/15351/12706.pdf
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Synthèse des Pêcheries 2002 - Flotte mer du Nord-Manche-Atlantique ArchiMer
Berthou, Patrick; Daures, Fabienne; Merrien, Claude; Leblond, Emilie; Guyader, Olivier; Jezequel, Michele; Bermell, Sylvain.
The document synthesizes the data collected in 2002 and 2003 as part of the Fisheries monitoring system of Ifremer. It updates the description of the status in 2000 of the French fishing fleets operating in the North Sea, Channel and Atlantic (produced in 2002). The document is made of a series of leaflets. The first leaflet provides a global description of the overall population of fishing vessels. Information provided includes vessel and crew characteristics, spatial distribution of fishing activity and catch, and gears used. A description of fleets (sub-groups of vessels using the same gear combinations) is also provided at both national and regional levels. The following leaflets provide a detailed description of the fishing activity and economic...
Tipo: Text Palavras-chave: France; Atlantique; Manche; Mer du Nord; Indicateurs économiques; Indicateurs d'activité; Engin; Métier; Flottille; Typologies; Pêche; France; Atlantic; Channel; North Sea; Economic indicators; Indicators of fishing activity; Gear; Metier; Fishing fleet; Typologies; Fishing sector.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/rapport-1226.pdf
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Tableau de bord de l'activité de la flotte de pêche du Finistère – étude en soutien à l'élaboration du schéma de référence des dragages en Finistère ArchiMer
Leblond, Emilie; Demaneche, Sébastien; Bermell, Sylvain.
This document was established within the framework of a study carried out to back up the elaboration of a dredging scheme in Finistère, answering a demand from the DDE-Finistère, and contains a list of dashboards concerning Finistère's fishing fleet and its activity in 2006, as well as charts presenting the main indicators per fishing area (statistical rectangle)....
Tipo: Text Palavras-chave: Cartes; Production; Activité; Finistère; Pêche; Flotte.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/rapport-3828.pdf
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