Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 12
Primeira ... 1 ... Última
Imagem não selecionada

Imprime registro no formato completo
Active tectonics of the Calabrian subduction revealed by new multi-beam bathymetric data and high-resolution seismic profiles in the Ionian Sea (Central Mediterranean) ArchiMer
Gutscher, Marc-andre; Kopp, Heidrun; Krastel, Sebastian; Bohrmann, Gerhard; Garlan, Thierry; Zaragosi, Sebastien; Klaucke, Ingo; Wintersteller, Paul; Loubrieu, Benoit; Le Faou, Yann; San Pedro, Laurine; Dominguez, Stephane; Rovere, Marzia; De Lepinay, Bernard Mercier; Ranero, Cesar; Sallares, Valenti.
The detailed morphology and internal structure of the Calabrian accretionary wedge and adjacent Eastern Sicily margin are imaged in unprecedented detail by a combined dataset of multi-beam bathymetry and high-resolution seismic profiles. The bathymetric data represent the results of 6 recent marine geophysical surveys since 2010 as well as a compilation of earlier surveys presented as a 2 arc-sec (60 m) grid. Several distinct morpho-tectonic provinces are identified including: the deeply incised Malta–Hyblean Escarpment, numerous submarine canyons, broad regions of relatively flat seafloor dominated by fields of sediment waves, the gently undulating anticlinal fold-and-thrust belts of the external Calabrian accretionary wedge and the adjacent portion of...
Tipo: Text Palavras-chave: Subduction; Active faults; Eurasia-Africa plate boundary; Bathymetry; Seismic profiles; Accretionary wedge.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00366/47685/47853.pdf
Imagem não selecionada

Imprime registro no formato completo
Choix du type de charge acoustique potentielle pour le H-ROV ArchiMer
Fabri, Marie-claire; Loubrieu, Benoit; Dupre, Stephanie; Opderbecke, Jan; Lurton, Xavier.
Ce document a pour objectif de préparer une réunion sur le choix du type de charge utile "Acoustique" pour le H-ROV. Ce document s'intéresse à la charge utile "cartographie acoustique". Il est réalisé avec l'objectif de préparer une réunion du groupe de travail scientifique du H-ROV. Il propose un bilan des différentes charges utiles acoustiques embarquables sur un engin sous-marin, ainsi que leur avantages et leurs inconvénients au regard des caractéristiques techniques du H-ROV. Au final un SONDEUR MULTIFAISCEAUX a été le choix considéré comme étant le plus adapté à l'environnement probable d'exploration du HROV (milieu à fort relief) ainsi qu'à ses caractéristiques techniques (autonomie réduite). Lors de l'intégration sur le SKID "Acoustique", il faudra...
Tipo: Text Palavras-chave: H-ROV; Cartographie acoustique.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00233/34382/32753.pdf
Imagem não selecionada

Imprime registro no formato completo
Le programme d’EXTension RAisonnée du PLAteau Continental (EXTRAPLAC). Enjeux pour les trois collectivités ultramarines du Pacifique (Nouvelle-Calédonie, Wallis & Futuna, Polynésie française). ArchiMer
Loubrieu, Benoit; Roest, Walter; Patriat, Martin; Loubersac, Lionel.
This article replaces the French program of legal extension of the continental shelf named EXTRAPLAC, interesting in particular the 3 overseas collectivities of the Pacific (New Caledonia, Wallis and Futuna and French Polynesia)” It considers this program in the context of the Convention of the United Nations on the Maritime law. It clarifies the governance system of this program set up by the authorities of the State. A specific chapter clarifies the constraints to be respected to build up the necessary file in respect of the international Committee requirements so said UNO Commission of the Limits of the Continental shelf. The article considers then scenarios presented by 3 territories and state of progress of the three cases, both regarding the...
Tipo: Text
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00217/32820/31254.pdf
Imagem não selecionada

Imprime registro no formato completo
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
Imagem não selecionada

Imprime registro no formato completo
Mass-transport deposits and fluid venting in a transform margin setting, the eastern Demerara Plateau (French Guiana) ArchiMer
Pattier, France; Loncke, L.; Gaullier, V.; Basile, C.; Maillard, Alexandre; Imbert, Patrice; Roest, Walter; Vendeville, B. C.; Patriat, Martin; Loubrieu, Benoit.
The eastern Demerara Plateau offshore French Guiana was surveyed in 2003 during the GUYAPLAC cruise (multibeam bathymetry and acoustic imagery, 6-channel seismic reflection and 3.5 kHz echo-sounding). The data show the "post-transform" Cenozoic that the series located on the outer part of the plateau (below c. 2000 m) contain at least twelve stacked mass transport deposits (MTDs) that have recorded a history of large-scale slope failure, as well as two main normal fault sets that provide possible pathways for upward fluid migration through the series, reaching at high as the uppermost MTDs. Seabed data show that the area above the failures is characterized by circular-to-elongate (slope-parallel) depressions interpreted as fluid seeps (pockmarks), some of...
Tipo: Text Palavras-chave: Fluid ascent; Pockmarks; MTDs; Transform margin; Demerara Plateau.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00157/26850/25316.pdf
Imagem não selecionada

Imprime registro no formato completo
Moyens mis en oeuvre pour la cartographie du plateau continental - Guide général ArchiMer
Rollet, Claire; Breton, Cecile; Loubrieu, Benoit; Satra Le Bris, Catherine.
Sur le plateau continental, du littoral jusqu’aux fonds atteignant une profondeur de plus 200 m, une multitude de données océanographiques est recueillie à partir d’une grande diversité de moyens. Ces moyens, souvent mis en œuvre de façon complémentaire, font appel à des technologies et à des expertises variées. Ce document présente les différentes technologies mise en œuvre pour la cartographie du plateau continental. Il introduit une série de guides, chacun étant dédié spécifiquement à une technique de la cartographie numérique.
Tipo: Text
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00071/18237/15801.pdf
Imagem não selecionada

Imprime registro no formato completo
Pockmarks on the South Aquitaine Margin continental slope: The seabed expression of past fluid circulation and former bottom currents ArchiMer
Michel, Guillaume; Dupre, Stephanie; Baltzer, Agnes; Ehrhold, Axel; Imbert, Patrice; Pitel, Mathilde; Loubrieu, Benoit; Scalabrin, Carla; Lazure, Pascal; Marie, Louis; Geldof, Jean-baptiste; Deville, Eric.
Inactive and mostly elongated pockmarks of 100–200 m in dimension were recently discovered on the South Aquitaine Margin continental slope. They are distributed at water depths greater than 350 m in both interfluve and sediment-wave areas, and are strongly controlled by the sedimentary morphology and architecture. Water column and seafloor backscatter and sub-bottom profiler data do not exhibit present-day or past gas evidence, e.g., massive and continuous gas releases at the seabed and fossil methane-derived authigenic carbonates. It is thus proposed that the pockmarks originated from a shallow source and result from relatively recent and short-duration gas or water expulsion events. Former near-bottom currents may have contributed to the elongation of...
Tipo: Text Palavras-chave: Pockmark; Fluid; Seabed morphology; Aquitaine slope; GIS; Currents.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00413/52491/53279.pdf
Imagem não selecionada

Imprime registro no formato completo
Premières observations sur la morphologie et les processus sédimentaires récents de l'Éventail celtique ArchiMer
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
Imagem não selecionada

Imprime registro no formato completo
Slope morphologies offshore Dakhla (SW-Moroccan margin) ArchiMer
Benabdellouahed, Massinissa; Baltzer, Agnes; Rabineau, Marina; Aslanian, Daniel; Sahabi, Mohamed; Germond, Fabien; Loubrieu, Benoit; Biari, Youssef.
This study explores a portion of the West African margin at the junction between two well- known segments offshore Dakhla and offshore Mauritania with destructional architecture characterized by giant slides. In between these two segments, the Dakhla segment has historically been described as a constructional section. During an oceanographic Dakhla cruise (2002), high resolution seismic data, swath bathymetry and imagery were acquired around latitude 23° N, offshore Dakhla,. This new data set reveals the existence of varied and complex morphologies on the continental slope, interpreted as a "shallot-shaped" canyon, seafloor depressions or pockmarks, ridges and scarps. These morphologies are interpreted as clues of sedimentary transfers and rupture...
Tipo: Text Palavras-chave: African margin; Bathymetry; Seismic interpretation; Pockmarks; Ridges; Scarps..
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00286/39736/38214.pdf
Imagem não selecionada

Imprime registro no formato completo
Sur les traces des coraux d'eau froide du golfe de Gascogne. 8 cartes bathymorphologiques et géomorphologiques au 1/100.000 ArchiMer
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
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00320/43162/42719.pdf
Imagem não selecionada

Imprime registro no formato completo
The Aquitaine Shelf edge (Bay of Biscay): a primary outlet for microbial methane release ArchiMer
Dupré, Stephanie; Loubrieu, Benoit; Pierre, C.; Scalabrin, Carla; Guerin, Charline; Ehrhold, Axel; Ogor, Andre; Gautier, Emeric; Ruffine, Livio; Biville, Romain; Saout, Johan; Breton, C; Floodpage, J.; Lescanne, M..
A few thousand (2612) seeps are releasing microbial methane bubbles from the seafloor at the Aquitaine Shelf edge (Bay of Biscay) at shallow water depths (140‐220 m). This methane contributes to the formation of meter‐scale subcircular carbonate structures, which are (sub‐)outcropping over 375 km2. Based on in situ flow rate measurements and acoustic data, and assuming steady and continuous fluxes over time, the methane entering the water column is estimated to 144 Mg/yr. Microbial methane circulation has been on‐going for at least a few thousand years. This discovery highlights the importance of microbial methane generation, disconnected from deep thermogenic sources and gas hydrates, at continental shelves. The shelf edge may be viewed as a focus area...
Tipo: Text Palavras-chave: Microbial methane; Continental shelf; Fluid emissions; High‐resolution acoustics; Aquitaine Margin; Methane‐derived authigenic carbonates.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00618/72982/72057.pdf
Imagem não selecionada

Imprime registro no formato completo
Young Marquesas volcanism finally located ArchiMer
Revillon, Sidonie; Guillou, Herve; Maury, Rene C.; Chauvel, Catherine; Aslanian, Daniel; Pelleter, Ewan; Scao, Vincent; Loubrieu, Benoit; Patriat, Martin.
The Marquesas Island chain in Polynesia is quite unusual because the alignment of the islands on the Pacific oceanic plate (N40°W) does not follow the plate motion in the region (N65°W). The exact location of the active hotspot is unknown but has been predicted to underlie the Marquesas Fracture Zone Ridge. Nevertheless, no concrete evidence exists. Here, we document the occurrence on this ridge of fresh tephrites dated at ~ 92 ka by the 40Ar-39Ar method. The lavas dredged on a small seamount have trace element contents and Sr, Nd, Pb isotopic compositions typical of the southwest Marquesas Islands, the Fatu Hiva group. This discovery demonstrates that the Marquesas plume is still active and it puts new constraints on its present location. It also supports...
Tipo: Text Palavras-chave: Submarine volcanism; Ar-40-Ar-39 ages; Geochemistry; Plume; Marquesas; French Polynesia.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00407/51832/52431.pdf
Registros recuperados: 12
Primeira ... 1 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional