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| Registros recuperados: 34 | |
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| 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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| 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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| Pautot, Guy; Hoffert, Michel; Karpoff, Anne Marie; Schaaf, André. |
| The Tiki basin is in the south central Pacific, south of the Marquesas Islands and east of the Tuamotu archipelago. It is bounded nothwards by the Marquesas Fracture Zone and divided in two parts by the topographic heights cunstituting the end to the Tuamotu Fracture Zone. One hundred stations with nodule sampling were occupied by the Group CNEXO-SLN in this area (scale 1O X 10 degrees). The nodule abundance at each station is determined from the weight of nodules brought back by free fall grabs. Chemical analysis were made on each sample (three by station) and the values presented here are the mean values. The parameters : abundance, Ni grade, Cu grade and Mn grade are compared with water depth and topographic features of the area. The main results are :... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/1981/publication-5307.pdf |
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| Hoffert, Michel; Karpoff, Anne-marie; Clauer, Norbert; Schaaf, André; Courtois, Chantal; Pautot, Guy. |
| A sedimentological, biostratigraphical, mineralogical, geochemical (major and trace elements including rare earths) and isotopic (Rb/Sr) study was made of core samples drilled between the Touamotou Archipelago and the Marquises Islands. This structurally complex region of the South Pacific is characterised by volcanism and deep ocean water circulation. The samples consisted of two 20 cm cores of surface sediment, and a flattened nodule with indurated centre, taken close to the cores. One core sample (T KR 07) is entirely composed of brown, soft sediment. The top part of the second core (T KS 19) is also brown mud but the bottom is indurated. The brown sediment is essentially composed of phillipsite, palagonite. micronodules and nontronite. The indurated... |
| Tipo: Text |
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| Ano: 1978 |
URL: http://archimer.ifremer.fr/doc/1978/publication-5231.pdf |
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| 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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| 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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| Pautot, Guy; Le Pichon, Xavier. |
| En nous appuyant sur les 13 rapports initiaux, publiés à ce jour, et sur les résultats sommaires des 15 autres parcours du bâtiment foreur "Glornar Challenger", nous présentons quelques aspects importants des principaux résultats acquis. Un jeu de cartes synthétiques est d'abord présenté : âge du substratum ou des sédiments les plus anciens atteints et, pour comparaison, cartes des isochrones du socle d'aprés les anomalies magnétiques. Ces documents sont établis à partir des diverses données publiées, souvent préliminaires, et que nous n'avons pas cherché à réconcilier dans le cas où des désaccords existaient. La même remarque s'applique d'ailleurs à l'ensemble de l'article. Nous attirons ensuite l'attention sur quelques aspects qui nous paraissent... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1973 |
URL: http://archimer.ifremer.fr/doc/1973/publication-5150.pdf |
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| 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 |
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| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/1981/publication-5319.pdf |
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| Pautot, Guy. |
| New oceanographic data enable us to precise the geological phenomena linked to the convergence zones of two lithospheric plates. Taking into example the Peruvian continental margin, the subduction phenomenon of the Nazca plate under the South-American plate can be tackled. This subduction occurs in the domain which is immersed by seisms, volcanism, magmatism and tectonics. We present the geophysical and sedimentological data specific to the oceanic domain of the Nazca plate and follow its evolution as it reaches the Peruvian margin. Up until the Peruvian fault, the analysis is relatively easy. |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1975 |
URL: http://archimer.ifremer.fr/doc/1975/publication-5083.pdf |
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| 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 |
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| Ano: 1979 |
URL: http://archimer.ifremer.fr/doc/1979/publication-5243.pdf |
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| Le Pichon, Xavier; Pautot, Guy; Weill, J.p.. |
| The Alboran Sea contains two basins deeper than 1,000 m separated by a ridge which we shall call the Alboran marginal fracture (Fig. 1). Seismic reflexion studies and data from the Joides drill site 121, situated exactly on the northern limit of the western basin, show that the deepest sedimentary layers, lying on the substratum, are older than upper Burdigalian (14 m.y.), but probably younger than lower Aquitanian (23 m.y.)1. But we do not know whether the substratum of the deep basins is young oceanic crust or foundered continental crust. Here we shall assume that the portions of the basins deeper than 1,000 m indeed consist of new surface created by the separation of two rigid plates during the Middle Miocene, and we shall discuss whether the... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1972 |
URL: http://archimer.ifremer.fr/doc/1972/publication-5043.pdf |
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| Auzende, Jean-marie; Olivet, Jean-louis; Pautot, Guy. |
| In a recent note (Mauffret et al, in press) we described the extension of the acoustic basement south of the Balearic mainland. One series of arguments (position, morphology, and magnetism) led us to advance the hypothesis that the acoustic basement represents a prolongation of the Balearic continental basement towards the south at least as far as 38' 30'N latitude. The prolongation appears to be marked by a large topographic rise between the 1000 and 2600 meter isobaths. Figure 1 (Mauffret et al, in press) schematically shows the continuation toward the south of this supposed Balearic continent. DSDP Leg 13 Drill Site 124 was located near 5°E longitude and 39°N latitude at the inferred southeast extremity of the sunken "Balearic continent". With reference... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1972 |
URL: http://archimer.ifremer.fr/doc/1972/publication-5036.pdf |
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| Pautot, Guy; Truillet, René; Hoffert, Michel. |
| Tubotomaculum are cylinder-shaped bodies a few centimetres long which can be found in pretty large quantities in the "numidian clays" of the upper Cretacean to Oligocene Mediterranean boundary. We present the observations conducted with electron microscopy. Geochemical and mineralogical analyses have been carried out. The manganese and iron contents are similar to the polymetallic nodules covering the bottom of today's oceans. We continued the comparison with the transition element contents (copper, nickel, cobalt). The Tubotomaculums' core is composed of rhodocrosite and siderite, while their cortex is made of non crystallised iron and manganese. The deposition localization is discussed through the analysis of the surrounding sediments. Different... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1975 |
URL: http://archimer.ifremer.fr/doc/1975/publication-4979.pdf |
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| Hoffert, Michel; Karpoff, Anne Marie; Schaaf, André; Pautot, Guy. |
| A sedimentological, mineralogial and geochemical study was made on surface sediment samples associated with nodules in the Tiki Basin (Central South Pacific). The aim of this study was to find variations in the sediment composition with respect to bathymetry and to thus show a relationship between nodule formation and sedimentation. It is now well known that nodules rich, from an economical point of view, are located in this area at a depth more than 4100 meters. The progressive transformation of a carbonate ooze rich in Foraminifera and poor in siliceous biogenic material into a metalifferous sediment has been shown. The CaCO(3), dissolution involves Fe and Mn enrichment of the sediment. The content of these elements becomes stable and independant of... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/1981/publication-5315.pdf |
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| Registros recuperados: 34 | |
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