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40 AR/39 AR ages for the alkaline volcanism and the basement of Gorringe Bank, North atlantic Ocean ArchiMer
Feraud, Gilbert; Gastaud, Janine; Auzende, Jean-marie; Olivet, Jean-louis; Cornen, Guy.
Gorringe Bank is situated on the Europe-Africa plate boundary at the eastern end of the Azores-Gibraltar fracture zone. It has two summits. Gettysburg Bank to the southwest and Ormonde Bank to the northeast. We applied the 40Ar/39AR stepwise heating method to date six samples of the alkaline volcanic rocks. Two gabbros from the Ormonde Bank and a dolerite from the Gettysburg Bank. The results suggest that the alkaline volcanism lasted probably for less than 6 Ma(66-60 Ma). Although the nature of this volcanism precludes any subduction feature during its setting. the alkaline volcanism of Ormonde is probably linked to Upper Cretaceous/Eocene compressive tectonic events. The basement rocks of Gorringe Bank reveal disturbed 40Ar/39Ar age spectra. One...
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1981 URL: http://archimer.ifremer.fr/doc/1981/publication-5365.pdf
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56. Morphology and Basement Structures of the Goban Spur Continental Margin (Northeastern Atlantic) and the Role of the Pyrenean Orogeny ArchiMer
Sibuet, Jean-claude; Mathis, B; Pastouret, Léo; Auzende, Jean-marie; Foucher, Jean-paul; Hunter, Peter; Guennoc, P; De Graciansky, Pc; Montadert, L; Masson, Douglas.
Tipo: Text
Ano: 1985 URL: http://archimer.ifremer.fr/doc/00184/29494/27815.pdf
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6. Multibeam Echo-Sounding Bathymetry of El Jadida Plateau and Escarpment, Mazagan, West Morocco ArchiMer
Auzende, Jean-marie; Monti, Serge; Ruellan, Etienne.
Tipo: Text
Ano: 1984 URL: http://archimer.ifremer.fr/doc/00184/29497/27814.pdf
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Accrétion océanique et déformation dans la partie méridionale du bassin Nord-Fidjien: résultats préliminaires de la campagne océanographique SEAPSO III du N.O. Jean-Charcot (décembre 1985) ArchiMer
Auzende, Jean-marie; Eissen, Jean-philippe; Caprais, Marie-paule; Gente, Pascal; Gueneley, S; Harmegnies, Francois; Lagabrielle, Yves; Lapouille, A; Lefevre, C; Maillet, P; Maze, Jean-pierre; Ondreas, Helene; Schaaf, A; Singh, R.
Seismic, Seabeam, magnetic and gravimetrie surveys in the southern part of the N-Fiji basin were conducted during the SEAPSO LEG III Cruise. The active spreading axis was recognized between 17°30'S and 21°S. It consists of a continuous N-S Ridge cross-cut by transverse directions oriented N25 and N45. North of 17°30'S, the spreading System is more complex due to the existence of a possible triple junction located around 15° S. The eastern part of the N-Fiji basin, west of Viti Levu is mostly characterized by alternating highs and deeps (<4,000 m). This area must be regarded no more as a spreading center, but as complex boundary suffering transverse tectonics.
Tipo: Text
Ano: 1986 URL: http://archimer.ifremer.fr/doc/00184/29492/27835.pdf
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Activité magmatique, tectonique et hydrothermale actuelle sur la Dorsale Est Pacifique entre17°-et 19°S(campagne NAUDUR) ArchiMer
Auzende, Jean-marie; Ballu, Valerie; Batiza, R; Bideau, Daniel; Cormier, Mh; Fouquet, Yves; Geistdoerfer, Patrick; Lagabrielle, Yves; Sinton, J; Spadea, P.
The submersible-study of four segments of the East Pacific Rise between 17 degrees and 18 degrees 40'S, where the spreading rate is greater than 150 mm/a, allows us to confirm the variability of the accretion processes. The segment between 17 degrees and 17 degrees 30'S shows an intense present-day magmatic activity. The one between 18 degrees 10' and 18 degrees 22'S shows a mainly tectonic activity. The segment between 18 degrees 22' and 18 degrees 37'S is an intermediate stage with an axial graben in which fresh lavas were emplaced by an extremely young eruption. On all the segments the hydrothermal activity exists ranging from shimmering water up to black smokers, It is associated with different stages of animal colonization.
Tipo: Text Palavras-chave: Océan Pacifique; Dorsale ultra-rapide; Magmatisme; Tectonique; Hydrothermalisme.; PACIFIC OCEAN; ULTRA-FAST SPREADING RIDGE; MAGMATISM; TECTONICS; HYDROTHERMALISM.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00183/29458/27840.pdf
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Activité tectonique, magmatique et hydrothermale autour des triples jonctions de16°50'S-173°30'E et de l6°30'S-l76°10E dans le bassin nord fidjien (SWPacifique): Campagne HYFIFLUX ArchiMer
Auzende, Jean-marie; Halbach, P; Allspach, A; Becker, K; Blum, N; Bonnier, Olga; Van Gerven, M; Halbach, M; Koschinsky, A; Lange, D; Madureira, Mj; Manoutsoglou, E; Mrazek, J; Munch, U; Pratt, C; Rahders, E; Van Reusel, A; Richter, S; Seifert, T; Spangenberg, T; Stenzler, J; Thiermann, F; Turkay, M; Windoffer, R.
The aim of the HYFIFLUX-SONNE 99 cruise was the geological, biological and chemical study of the 2 triple-junctions characterizing the oceanic accretion in the North Fiji Basin. Multibeam bathymetric coverage, in situ observations and sampling confirmed the existence of an active spreading ridge immediately west of the Fiji islands (WFR), and gave an evaluation of the magmatic and hydrothermal activity of the central ridge (CSR). New hydrothermal sites have been discovered and sampled.
Tipo: Text Palavras-chave: SW Pacifique; Dorsales; Magmatisme; Tectonique; Hydrothermalisme.; SW PACIFIC; RIDGES; MAGMATISM; TECTONISM; HYDROTHERMALISM.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/00183/29453/27843.pdf
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Affleurements des roches profondes de la croûte océanique et du manteau sur le mur sud de la fracture Kane (Atlantique central) : observations par submersible ArchiMer
Auzende, Jean-marie; Cannat, M; Gente, Pascal; Henriet, Jean-pierre; Juteau, Thierry; Karson, J; Lagabrielle, Yves; Mevel, Christophe; Tivey, M.
The aim of the 20 Nautile dives of the recent Kanaut cruise was the study of the Kane Fracture Zone from its intersection with the Mid-Atlantic Ridge up to 80 km to the west. The dives have been conducted along four massifs located along the southern wall of the fracture valley. The flanks of the massifs consist of slightly tilted peridotites, gabbros and basalts, which have been exposed along normal and strike-slip major faults. No dike complex similar to that observed along the ZF Vema was observed The observed sections show pervasive cataclastic deformation and greenschist-facies metamorphic overprint.
Tipo: Text
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00183/29470/27886.pdf
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Axial accretion in the north Fiji basin (SW Pacific) between 16° and 22° S ArchiMer
Auzende, Jean-marie; Eissen, Jp; Lafoy, Y; Gente, P; Charlou, Jean-luc.
Tipo: Text
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00070/18109/15657.pdf
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Benefits of swath mapping for the identification of marine habitats in the New Caledonia Economic Zone ArchiMer
Van De Beuque, Sabrina; Auzende, Jean-marie; Lafoy, Yves; Grandperrin, René.
The ZoNeCo programme is devoted to the evaluation of the marine resources of the Economic Zone of New Caledonia. The results are essentially dependent on the quality of the seafloor mapping. From 1993 to 1996, four geological and geophysical surveys using the EM12 DUAL multibeam echosounder provided swath-mapping and acoustic imagery data of the seafloor of selected sites on the northern and southern parts of the Norfolk ridge, the Loyalty basin, around the Loyalty islands and in the westernmost part of the Economic Zone of New Caledonia. The accuracy of these documents shows the morphology of the seafloor in detail and allows rocky substratum to be differentiated from muddy bottom. It allows favorable emplacements of future exploratory fishing surveys to...
Tipo: Text Palavras-chave: Ressources marines; Habitats marins; Cartographie multifaisceaux; Nouvelle Calédonie; Sud Ouest Pacifique; Marine resources; Marine habitats; Swath mapping; New Caledonia; SW Pacific.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/publication-833.pdf
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Cinématique de l'Atlantique Nord et Central ArchiMer
Jolivet, J.l.; Bonnin, J; Beuzart, Paul; Auzende, Jean-marie.
The three central chapters of this work constitute an explanatory comment of the jointed Central North Atlantic reconstruction maps. In the first chapter, the model is situated relatively to other works devoted to the evolution of the Atlantic ocean, the data used and the methods followed are exposed. In th fifth chapter, we discuss some of the several implications of the model. The main characteristic of this approach is that it aims to integrate from the beginningthe major plate system constituted by: the North American, Eurasian and African plates. For each geological period, results of the detailed regional studies are referred to the evolution of the whole system and evaluated according to it. [NOT CONTROLLED OCR]
Tipo: Text
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/publication-7439.pdf
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Considérations sur l'origine et la mise en place des ophiolites des Alpes Occidentales : apport de la connaissance des structures océaniques ArchiMer
Auzende, Jean-marie; Polino, R; Lagabrielle, Yves; Olivet, Jean-louis.
We suggest that some. ophiolites of the "Schistes Lustrés Nappe" (Western Alps) originated from oceanic massives thrusted and tectonically incorporated into the ocean sediments during early compressive events. This interprétation is supported by field observations and oceanic data.
Tipo: Text
Ano: 1983 URL: http://archimer.ifremer.fr/doc/00184/29500/27851.pdf
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Description géologique de la bordure provençale ArchiMer
Olivet, Jean-louis; Auzende, Jean-marie; Mascle, Jean; Monti, S.; Pastouret, Léo; Pautot, Guy.
Recent data on the western Mediterranean basin (Joides cruise, Montadert et al., 1970, Auzende et al., 1971, Le Borgne et al., 1971) and its connection with the evolution of the Atlantic area (Le Pichon et al., 1970, Talwani et al., 1971, Le Pichon et al. in writing) lead us, like other authors (Dubourdieu, 1962, Stanley and Mutti, 1968, Ryan, 1969 amongst others) to admit the theory of an opening of the Algero-provencal basin during the Cenozoic era. A series of arguments drove us to formulate the hypothesis of an Oligocene age (in process). This work is in line with this perspective. [...]
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1971 URL: http://archimer.ifremer.fr/doc/1971/publication-4907.pdf
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Extensive magmatic and hydrothermal activity in Manus Basin ArchiMer
Auzende, Jean-marie; Ishibashi, J; Beaudouin, Y; Charlou, Jean-luc; Delteil, J; Donval, Jean-pierre; Fouquet, Yves; Gouillou, Jp; Ildefonse, B; Kimura, H; Nishio, Y; Knoery, Joel; Ruollan, E.
In 1995, a joint French‐Japanese cruise (ManusFlux) explored the Manus Spreading Center and some sites of the South Eastern Rift in the Manus Basin off the coast of Papua New Guinea (Figure 1) with the Japanese submersible [Auzende et al., 1996; Gamo et al., 1997]. In the framework of this joint project, called New STARMER, the French and Japanese teams completed the Manaute cruise with the R/V LAtalante and the Ifremer submersible Nautile in April and May 2000. The Manaute cruise explored and sampled volcanic and hydrothermal sites in the eastern part of Manus Basin and on the spreading axis of the Western Ridge (WR). The eastern part of the Manus Basin (Figure 2) was interpreted as a stretched‐back arc basin crust showing alternatively elongated ridges...
Tipo: Text
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00069/18055/15597.pdf
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From intracratonic extension to mature spreading in back arc basins: Examples from the Okinawa, Lau, North Fiji basins ArchiMer
Auzende, Jean-marie; Boespflug, Xavier; Bougault, Henri; Dosso, Laure; Foucher, Jean-paul; Joron, Jean-louis; Ruellan, Etienne; Sibuet, Jean-claude.
Three cruises (POP 1, SEAPSO 3 and SEAPSO 4) carried out during the "Tour du Monde" of the R.V. Jean Charcot allow us to obtain new structural and geochemical data for the Okinawa, North Fiji and Lau basins. Taken together, the structural and geochemical data illustrate a difference in evolution stages of these sites. The less evolved stage is represented by the Okinawa basin, where accretion is evidenced only by volcanic intrusion into a thinned continental crust. The most evolved stage is illustrated in the North Fiji basin, where the present-day accretion can be directly compm·ed to the East Pacific Ridge. The Lau basin displays an intem1ediate stage with a complex system of accretionary ridges. This difference in the evolution stage is translated in...
Tipo: Text Palavras-chave: Ouest Pacifique; Bassins arriere arc; Structure; Accretion; Geochimie; West Pacific; Back arc basins; Structure; Accretion; Geochemistry.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00119/23058/20893.pdf
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Geological sampling in deep water: A new instrument is necessary. ArchiMer
Girardeau, J; Auzende, Jean-marie; Boillot, G.
The Nautile submersible is used to observe the underwater geological structures and to conduct geological sampling in deep water. But it is not sufficient because it is not possible to measure the faults in the oceanic rifts.
Tipo: Text Palavras-chave: Faults; Palaeomagnetism; Tectonics; Submersibles; Surveying underwater; Surveys; Seafloor sampling; Marine technology; Deep water.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/1990/acte-1154.pdf
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Géologie des Escarpements de Porcupine et de Goban (N.E. Atlantique). Résultats de la campagne de plongée CYAPORC. ArchiMer
Auffret, Gerard; Auzende, Jean-marie; Cousin, Michel; Coutelle, Alain; Dobson, M; Geoghegan, M; Masson, D.; Rolet, J; Vaillant, P.
The aim of the joint French-British CYAPORC submersible cruise was the exploration and sampling of the Porcupine and Goban Escarpments. A paleozoic mesozoic sedimentary cover has been evidenced abov ea caledonian or older cristalline basement on the Porcupine scarp. On the Goban scarp, the observed outcrops are mainly lower Cretaceous carbonates overlying paleozoic sandstones
Tipo: Text
Ano: 1987 URL: http://archimer.ifremer.fr/doc/00184/29489/27853.pdf
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Géologie dynamique - Les orientations structurales et magnétiques sous-marines au sud de la corse et la dérive corso-sarde ArchiMer
Gennesseaux, Maurice; Auzende, Jean-marie; Olivet, Jean-louis; Bayer, Roger.
West of the Bouches de Bonifacio, the lengthening directions of the magnetic anomalies reduced to the pole coincide with those of the basement's outcrops. They certainly correspond to north-west - south-east faults, injected with volcanic material and probably linked to the opening of the western basin.
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1974 URL: http://archimer.ifremer.fr/doc/1974/publication-5438.pdf
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Hydrothermalisme et communautés animales associées sur la dorsale du Pacifique oriental entre17°S et 19°S (campagne Naudur, décembre 1993) ArchiMer
Geistdoerfer, P; Auzende, Jean-marie; Batiza, R; Bideau, Daniel; Cormier, Mh; Fouquet, Yves; Lagabrielle, Yves; Sinton, J; Spadea, P.
70 hydrothermal sites were observed during the 23 dives of the French submersible Nautile (''Naudur'' cruise, December 1993), at 17-degrees-19-degrees-S on the East Pacific Rise. Large vent-animal communities are present around these sites. The zoological composition of these communities is the same as that of the communities at 11-degrees-13-degrees-N and 21-degrees-N on the East Pacific Rise. However, the distribution of the species on the sites is different from all the other hydrothermal communities; large anemone fields of several hundred square metres, associated with colonies of Bathymodiolus and Calyptogena, have been observed. Fresh lava areas seem to bear the most important biological activity.
Tipo: Text Palavras-chave: Hydrothermalisme; Dorsale Est Pacifique; Communautés animales.; HYDROTHERMAL VENTS; EAST PACIFIC RISE; ANIMAL COMMUNITIES.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/00183/29454/27856.pdf
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Japanese submersible explores the north Fiji basin ArchiMer
Auzende, Jean-marie; Urabe, T.; Tanahashi, M.; Ruellen, E.; Bendel, V.; Fiala-medioni, A.; Fujikura, K.; Geistdoerfer, P.; Gracia-mont, E.; Grimaud, D.; Ihibashi, J. I.; Joshima, M.; Kisimoto, K.; Kojima, S.; Maillet, P.; Matsumoto, T.; Mitsuzawa, K.; Murai, M.; Naka, J.; Nargeolet, P. H.; Nojiri, Y.; Ohta, S.; Pranal, V.; Pratt, C..
Since 1987, Japanese and French geologists, geophysicists, and biologists have been studying the North Fiji Basin Ridge within the framework of a joint project named STARMER (Science and Technology Agency of Japan—IFREMER of France). This ridge was first geologically, geophysically, and geochemically surveyed during the 1985 SEAPSO 3 cruise of the R/V Jean Charcot [Auzende et al., 1988]. At that time, water sampling and morphotectonic analysis indicated that the North Fiji Basin Ridge was technically and hydrothermally active. Within the STARMER project, four surface ship cruises have been conducted {Kaiyo 87‐88‐89 and Yokosuka 90). One significant result of these surveys is the complete mapping of the entire ridge between 14°S and 22°S (Figure 1), an area...
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Ano: 1992 URL: http://archimer.ifremer.fr/doc/00451/56267/57838.pdf
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La dépression nord-baléare (Espagne) ArchiMer
Auzende, Jean-marie; Olivet, Jean-louis; Mauffret, Alain; Pautet, Guy.
This document is a structural scheme of the northern Balearic depression based on continuous seismic-reflection profiles and on the results of the drilling cruise (n° 13) of the "Glomar Challenger" in the Mediterranean Sea. This scheme is linked, to a larger extent, to the hypothesis of the opening of the north-western Mediterranean Sea during the Oligocene epoch.
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1972 URL: http://archimer.ifremer.fr/doc/1972/publication-4903.pdf
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