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| Registros recuperados: 14 | |
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| Aidi, Chafik; Beslier, Marie-odile; Yelles-chaouche, Abdel Karim; Klingelhoefer, Frauke; Bracene, Rabah; Galve, Audrey; Bounif, Abdallah; Schenini, Laure; Hamai, Lamine; Schnurle, Philippe; Djellit, Hamou; Sage, Francoise; Charvis, Philippe; Deverchere, Jacques. |
| During the Algerian-French SPIRAL survey aimed at investigating the deep structure of the Algerian margin and basin, two coincident wide-angle and reflection seismic profiles were acquired in central Algeria, offshore Greater Kabylia, together with gravimetric, bathymetric and magnetic data. This ~260 km-long offshore-onshore profile spans the Balearic basin, the central Algerian margin and the Greater Kabylia block up to the southward limit of the internal zones onshore. Results are obtained from modeling and interpretation of the combined data sets. The Algerian basin offshore Greater Kabylia is floored by a thin oceanic crust (~4 km) with P-wave velocities ranging between 5.2 and 6.8 km/s. In the northern Hannibal High region, the atypical 3-layer... |
| Tipo: Text |
Palavras-chave: Mediterranean Sea; Algerian margin; Crustal structure; Tectonic inversion; Post-accretion magmatism; Deep seismics. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00425/53677/54519.pdf |
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| Paulatto, Michele; Laigle, Mireille; Galve, Audrey; Charvis, Philippe; Sapin, Martine; Bayrakci, Gaye; Evain, Mikael; Kopp, Heidrun. |
| Subducting slabs carry water into the mantle and are a major gateway in the global geochemical water cycle. Fluid transport and release can be constrained with seismological data. Here we use joint active-source/local-earthquake seismic tomography to derive unprecedented constraints on multi-stage fluid release from subducting slow-spread oceanic lithosphere. We image the low P-wave velocity crustal layer on the slab top and show that it disappears beneath 60–100 km depth, marking the depth of dehydration metamorphism and eclogitization. Clustering of seismicity at 120–160 km depth suggests that the slab’s mantle dehydrates beneath the volcanic arc, and may be the main source of fluids triggering arc magma generation. Lateral variations in seismic... |
| Tipo: Text |
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| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00392/50321/51004.pdf |
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| Badji, Rabia; Charvis, Philippe; Bracene, Rabah; Galve, Audrey; Badsi, Madjid; Ribodetti, Alessandra; Benaissa, Zahia; Klingelhoefer, Frauke; Medaouri, Mourad; Beslier, Marie-odile. |
| For the first time, a deep seismic data set acquired in the frame of the Algerian-French SPIRAL program provides new insights regarding the origin of the westernmost Algerian margin and basin. We performed a tomographic inversion of traveltimes along a 100-km-long wide-angle seismic profile shot over 40 ocean bottom seismometers offshore Mostaganem (Northwestern Algeria). The resulting velocity model and multichannel seismic reflection profiles show a thin (3-4 km thick) oceanic crust. The narrow ocean-continent transition (less than 10 km wide) is bounded by vertical faults and surmounted by a narrow almost continuous basin filled with Miocene to Quaternary sediments. This fault system, as well as the faults organized in a negative-flower structure on the... |
| Tipo: Text |
Palavras-chave: Seismic tomography; Continental margins: transform; Crustal structure; Africa; Europe.. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00255/36670/35278.pdf |
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| Récy, Jacques; Pelletier, Bernard; Charvis, Philippe; Gérard, Martine; Monjaret, Marie-Claire; Maillet, Patrick. |
| Cet article présente une synthèse des résultats concernant la géophysique, la géologie structurale, la stratigraphie, la pétrographie, la géochronologie et la micropaléontologie, obtenus sur les fossés arrière-arc des Nouvelles-Hébrides dans le cadre de la campagne Seapso 2 et des campagnes complémentaires Multipso, Eva 13 et Eva 14. Trois domaines de l'arc sont étudiés: le domaine central, où n'apparaît aucun indice d'extension, la partie Sud, caractérisée par les fossés du Coriolis, et la partie Nord, où sont développés les fossés du Nord |
| Tipo: Text |
Palavras-chave: ARC VOLCANIQUE; SUBDUCTION; TECTONIQUE DE PLAQUES; PROFIL SISMIQUE; BATHYMETRIE; EXTENSION TECTONIQUE; HORST; GRABEN; FOSSE ARRIERE ARC; BASSIN MARGINAL. |
| Ano: 1990 |
URL: http://www.documentation.ird.fr/hor/fdi:31935 |
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| Récy, Jacques; Charvis, Philippe; Ruellan, E.; Monjaret, Marie-Claire; Gérard, Martine; Auclair, G.; Baldassari, Catherine; Boirat, J.M.; Brown, G.R.; Butscher, John; Collot, Jean-Yves; Daniel, Jacques; Louat, Rémy; Monzier, Michel; Pontoise, Bernard. |
| L'arrière-arc des Nouvelles-Hébrides est caractérisé par deux régions structurées en horsts et grabens, au nord et au sud, encadrant une zone centrale clairement affectée par des compressions. Dans le nord, les grabens peu marqués dans la morphologie sont associés à d'importantes manifestations volcaniques récentes et actuelles. Localement, des dépôts manganèsifères témoignent d'une activité hydrothermale récente. Dans les fossés du Coriolis, les laves draguées sont de nature différente de celles des fossés nord ; en particulier, des basaltes ankaramitiques frais ont été recueillis au fond du fossé de Futuna. Ces structures et, plus spécialement, le fossé de Futuna au sud et le fossé de Vot Tande au nord, se sont mis en place sous l'effet d'une extension... |
| Tipo: Text |
Palavras-chave: MORPHOLOGIE; FOND MARIN; DRAGAGE; LAVE; VOLCANISME; ARC INSULAIRE; EXTENSION TECTONIQUE; CONVERGENCE; STRUCTURE; FOSSE OCEANIQUE; HYDROTHERMALISME; DEFORMATION. |
| Ano: 1986 |
URL: http://www.documentation.ird.fr/hor/fdi:24216 |
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| De Lepinay, Bernard Mercier; Deschamps, Anne; Klingelhoefer, Frauke; Mazabraud, Yves; Delouis, Bertrand; Clouard, Valerie; Hello, Yann; Crozon, Jacques; Marcaillou, Boris; Graindorge, David; Vallee, Martin; Perrot, Julie; Bouin, Marie-paule; Saurel, Jean-marie; Charvis, Philippe; St-louis, Mildor. |
| After the January 12, 2010, Haiti earthquake, we deployed a mainly offshore temporary network of seismologic stations around the damaged area. The distribution of the recorded aftershocks, together with morphotectonic observations and mainshock analysis, allow us to constrain a complex fault pattern in the area. Almost all of the aftershocks have a N-S compressive mechanism, and not the expected left-lateral strike-slip mechanism. A first-order slip model of the mainshock shows a N264 degrees E north-dipping plane, with a major left-lateral component and a strong reverse component. As the aftershock distribution is sub-parallel and close to the Enriquillo fault, we assume that although the cause of the catastrophe was not a rupture along the Enriquillo... |
| Tipo: Text |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00054/16557/14071.pdf |
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| Registros recuperados: 14 | |
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