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Registros recuperados: 35
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A granite cliff deep in the North Atlantic ArchiMer
Pautot, Guy; Renard, Vincent; Auffret, Gérard-andré; Pastouret, Leo; De Charpal, Olivier.
WE report here preliminary results from the detailed sampling of granitic basement at a depth of 4.000 m at the lower edge of the Armorican continental margin near 48°N and 12°W. We consider that we have sampled here the extreme lateral limit of the continental crust where local exposures emerge from under a cover of Cainozoic,Mesozoic and probable Palaeozoic sediments. [NOT CONTROLLED OCR]
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1976 URL: http://archimer.ifremer.fr/doc/1976/publication-5181.pdf
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Atlantique nord : étude préliminaire des roches de la fracture Gibbs (53° Nord) et de la zone de fracture Açores-Gibraltar. ArchiMer
Hekinian, Roger; Bougault, Henri; Pautot, Guy.
[OCR NON CONTRÔLE]
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1973 URL: http://archimer.ifremer.fr/doc/1973/publication-5059.pdf
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Cadre morphologique de la Baie des Anges (Nice-Côte d'Azur) : modèle d'instabilité de pente continentale ArchiMer
Pautot, Guy.
A revised bathymetric chart of the Baie des Anges of Nice-Côte d'Azur has been produced using the Sea-Beam multibeam echo-sounder. The narrow beams of this new system and precision radionavigation techniques have resulted in seven charts at a scale of 1/10 000 with a contour intervals of 10m. The analysis of these charts delineates the principal morphologic units of the region : two active canyons (the Var and the Paillon), two sedimentary ridges extending from Cape Antibes and Cape Ferrat, a coastal sediment fan and a fossil deltaic system. The entire area appears to be undergoing erosion at present, principally by gravity mass movements. [NOT CONTROLLED OCR]
Tipo: Text
Ano: 1981 URL: http://archimer.ifremer.fr/doc/1981/publication-5319.pdf
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Comparaison géochimique et minéralogique entre la zone des dômes et la marge continentale ArchiMer
Pautot, Guy; Hekinian, Roger; Bougault, Henri.
Nous avons reporté les valeurs des dosages en éléments-traces et les pourcentages en argiles pour essayer de dégager des éléments de comparaison entre la zone des dômes et le domaine de la marge continentale. Très schématiquement, nous avons effectué la division géographique suivante: - T 9, T 13, T 14 : dômes salifères ? - T 1, T 10 : bas de pente - T 4, T 7 : ride sédimentaire. [OCR NON CONTRÔLE]
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1971 URL: http://archimer.ifremer.fr/doc/1971/publication-4906.pdf
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Continuous Deep Sea Salt Layer along North Atlantic Margins related to Early Phase of Rifting ArchiMer
Pautot, Guy; Le Pichon, Xavier.
Deep seismic reflexion surveys have revealed diapiric structures in deep water off Labrador, Newfoundland, Mauritania, Morocco, Portugal, Spain and lreland as well as in the Mediterranean. Many of these diapirs are similar to the Gulf of Mexico salt domes, and it is suggested that there is a continuous deep sea sait layer, off the continental margin, which is related to the early phase of rifting. [NOT CONTROLLED OCR]
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1970 URL: http://archimer.ifremer.fr/doc/1970/publication-4874.pdf
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Deep bottom currents, sedimentary hiatuses and polymetallic nodules ArchiMer
Pautot, Guy; Melguen, M..
Recent studies undertaken by the Centre National pour l'Exploitation des Oceans have focused some attention on the environment of nickel- and copper-bearing iron-manganese nodules in the Tuamotu Archipelago region of the South Pacific. The results indicate that the distribution of the nodules is closely linked to that of deep currents in the area. We attempt to show that these currents are associated mainly with the Antarctic Bottom Water and we attribute the episodical character of nodule formation in this region to major pulsations of the Antarctic Bottom Water. A synthesis of what are considered to be primary factors in the nodules formation are incorporated into a tentative model which is presented as a guide for future exploration for polymetallic...
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1975 URL: http://archimer.ifremer.fr/doc/1975/publication-5087.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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Evolution de la sédimentation pendant le Néogène en Méditerranée d'après les Forages JOIDES-DSDP ArchiMer
Nesteroff, Wladimir D.; Ryan, William B.f.; Hsu, Kenneth J.; Pautot, Guy; Wezel, Forese C.; Lort, Jennifer M.; Cita, Maria B.; Maync, Wolf; Stradner, Herbert; Dumitrica, Paulian.
Examination of the GLOMAR CHALLENGER cores in the Mediterranean Sea (Leg 13) enables us to distinguish three main lithological units in the Neogene series. The lower unit is composed of blue marls with a poor, or dwarfed, fauna. The marls are of Langhian, Serravalian and Tortonian age, and are very similar to the blue marls of the same age known on land (in the Rhône basin, Vienna Basin, the Panonic Basins, etc.). This suggests that the Vindobonian Tethys received a uniform type of sedimentation. [NOT CONTROLLED OCR]
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1972 URL: http://archimer.ifremer.fr/doc/1972/publication-5434.pdf
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Fragmentation de la plaque Nazca à l'Ouest de la fosse du Pérou : résultats de la campagne SEAPERC du N.O. Jean-Charcot, juillet 1986 IRD
Pautot, Guy; Bourgois, Jacques; Bandy, William; Pelletier, Bernard.
Tipo: Text Palavras-chave: SUBDUCTION; PLAQUE NAZCA; FRAGMENTATION; MENDANA ZONE FRACTURE.
Ano: 1986 URL: http://www.documentation.ird.fr/hor/fdi:23294
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Granodiorites, granulites et charnockities de l'éperon de goban (marge armoricaine) au contact du domaine océanique ArchiMer
Pautot, Guy; Didier, Jean; Guennoc, Pol.
In the Goban spur area, very close to the oceanward edge of the continental crust, the base of the armorican margin is made up of granulite and charnockite of indeterminate age intruded by a late hercynian granodiorite (Circa 281 M.Y). [NOT CONTROLLED OCR]
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1977 URL: http://archimer.ifremer.fr/doc/1977/publication-5195.pdf
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Gypsum-calcite rosettes in sediments from the Congo deep-sea fan ArchiMer
Pautot, Guy; Fontes, Jc.
The occurrence of "rose"-like aggregates with diameters of a few centimetres in a core of dark brown siliceous mud of the Congo deep-sea fan (depth of 4 070 m) is reported. The rosettes are well preserved. They have the crystalline outlines of gypsum but are made of calcite (97% with traces of quartz and clay minerals. In addition to the preserved specimens, fragments of rosettes occur at various levels in the sedimentary column. The core was taken on a levee of the submarine canyon and the depositional environment is thus compatible with down-slope sedimentation. Discussion concerning the origin of the rosettes takes into account regional morphology and structure, sedimentary cover and the isotopic composition of calcite from the rosettes. The most...
Tipo: Text
Ano: 1979 URL: http://archimer.ifremer.fr/doc/1979/publication-5243.pdf
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Histoire Sédimentaire de la Région au large de la Côte d'Azur ArchiMer
Pautot, Guy.
Detailed investigation of a portion of the sea-floor off the French Riviera serves to detail the history of the Algéro-Provençal Basin. The chemical composition and physical properties of sediments and the stratigraphy and structural framework are considered together. Both stratigraphy and structural framework of the sedimentary cover are examined by means of deep drilling, coring and seismic reflection. It appears that the unconsolidated sedimentary cover of the continental slope is Plio-Quaternary in age. This cover displays abundant slumping structures which have resulted from contemporaneous tectonic movements. The basement south of Cannes corresponds to an extension of the crystalline Maures Massif which subsided during Mio-Pliocene time. The central...
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1972 URL: http://archimer.ifremer.fr/doc/1972/publication-5112.pdf
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Influence of deep water circulation and sea floor morphology on the abundance and grade of central south pacific manganese nodules ArchiMer
Pautot, Guy; Melguen, Marthe.
Analyses of polymetallic nodules from the central south Pacific and from the underlying sediments indicate that nodule abundance is at least partly related to the degree of carbonate dissolution, which, it self, is strongly influenced by the flow o f the Antarctic Bottom Water. The greatest nodule abundance is generally encountered in a 300 to 400 meter thick water layer situated between the lysocline and the calcite compensation depth levels.This range of depth is the first and main controlling factor of abundance. Inside this range, the bathymetry represents a secondary factor influencing both abundance and grade.Some correlations appear locally between nodule grade and abundance.Nodule grade seems to be generally related to the bottom morphology. Ni, Cu...
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/1979/publication-5277.pdf
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La dorsale medio-atlantique et le renouvellement des fonds océaniques ArchiMer
Pautot, Guy.
There is an important gap between marine studies based upon geophysics and field geology, which fundamentally remains at a descriptive level. If we want to reach a general understanding of the earth history, we must consider all the informations from land and oceanic areas. This short paper is an attempt to draw the attention of geologists upon the data acquired in oceanic areas. From the example of the mid-ocean atlantic ridge (studied through geophysical and geological methods), the theories of sea floor spreading and plate tectonics are exposed. Considering these theories, a model for the origin of the Atlantic ocean can be established. Obviously, the atlantic origin depends on compression, distension and shear strength phenomena, that have had an...
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1970 URL: http://archimer.ifremer.fr/doc/1970/publication-4881.pdf
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La faille transformante Gibbs entre le Rift et la marge du Labrador ArchiMer
Olivet, Jean-louis; Sichler, Bertrand; Thonon, Pierre; Le Pichon, Xavier; Martinais, Guy; Pautot, Guy.
The Gibbs fracture moves the central Rift of the Mid-Atlantic Ridge 370 km to the left at latitude 53O north. It is the only fracture located between Europe and America that can be compared to the large equatorial fractures mapped by B.C. Heezen and M. Tharp between Africa and America. Its morphology is a major element in the understanding of the structural framework of the northern Atlantic Ocean. The identification of its extension to the west was one of the proposed focuses for the first Noratlante expedition of the R.V. Jean-Charcot (conducted in August 1969 under the authority of the C.N.E.X.O.). J.T. Wilson (2) suggested, in his hypothesis of sea-bed spreading from the dorsal axis, that such fractures are "transforming faults" that are active only...
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1970 URL: http://archimer.ifremer.fr/doc/1970/publication-4875.pdf
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La marge continentale algérienne et le phénomène de subsidence : exemple du Golfe de Bougie ArchiMer
Auzende, Jean-marie; Pautot, Guy.
The study of a continuous seismic-reflection profile (Flexotir) carried out in the central part of the Bougie gulf, enabled the identification of a thick sediment series leaning on the continental basement and continuing underneath the abyssal plain. On the one hand, this series contains a formation (D) thought to be a Miocene salt layer, and on the other hand, it keeps the trace of some upheaval and subsidence movements which define the recent tectonic history of the Bougie gulf. No trace of the current compression phenomenon between the Eurasian and African plates could be found.
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1970 URL: http://archimer.ifremer.fr/doc/1970/publication-4886.pdf
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La méditerranée occidentale depuis l'oligocène, schéma d'évolution ArchiMer
Le Pichon, Xavier; Pautot, Guy; Auzende, Jean-marie; Olivet, Jean-louis.
The evolution of the Western Mediterranean basin during Tertiary time is discussed. It is proposed that it was created by a continental drift process during Middle Oligocene time, synchronously with the creation of the grabens over the continents. The significance of the Messinian evaporitic sedimentary episode is discussed in liaison with the problem of large scale subsidence which has been at least six kilometers since Oligocene time. [NOT CONTROLLED OCR]
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1971 URL: http://archimer.ifremer.fr/doc/1971/publication-4921.pdf
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La zone de fracture des Marquises ArchiMer
Pautot, Guy; Dupont, Jacques.
The Marquise fracture zone is an elongated structure, with an irregular topography, which distinguishes areas of different depths. It is 3 500 km long, from its contact point with the oceanic crust of the East-Pacific ridge to its contact point with the northern end of the Touamotou archipelago. Its general direction is West-South-West - East-North-East. It is made up of 5 segments whose morphology and direction differ. These segments' inflection points correspond to those of the North Pacific fractures.
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1974 URL: http://archimer.ifremer.fr/doc/1974/publication-5461.pdf
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Les canyons du Var et du Paillon (marge des Alpes méridionales-Méditerranée occidentale) : une origine quaternaire par glissement. ArchiMer
Guillocheau, Francois; Pautot, Guy; Auzende, Jean-marie.
A morphological analysis of the Baie desAnges (Nice) Seabeam map has been carried out in order to investigate the genesis of the Var and Paillon submarine canyons. From the identification of the morphological units at différent scales one is able to proposea model for the formation of the canyons, The Var and Paillon canyons are interpreted as being cut in a deep-sea fan presently being destroyed by mass wasting processes. .The structural framework exhibits an orthogonal fault system which plays a prominent role in the spatial distribution of the canyons and the sliding areas. The age of these canyons is thought to be Quatenary.
Tipo: Text
Ano: 1983 URL: http://archimer.ifremer.fr/doc/00184/29499/27852.pdf
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Les glissements sous-marins de la pente continentale niçoise et la rupture de câbles en mer Ligure (Méditerranée occidentale). ArchiMer
Gennesseaux, Maurice; Mauffret, Alain; Pautot, Guy.
On October 16, 1979, off the Bay of Nice, a turbidity current, generated by large submarine landslides. was channelled by submarine valleys down to the bathyal plain of the Ligurian Sea where it seriously damaged two submarine cables, at about 80 and 110 km from its starting-point. The measured mean speeds were 17 km/h, above the first cable, and 7 km/h between the two cables, but the speed may have reached 40 km/h on the upper slope. [NOT CONTROLLED OCR]
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1980 URL: http://archimer.ifremer.fr/doc/1980/publication-5314.pdf
Registros recuperados: 35
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