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| Registros recuperados: 34 | |
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| 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 |
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| Ano: 1983 |
URL: http://archimer.ifremer.fr/doc/00184/29499/27852.pdf |
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| 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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| 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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| 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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| 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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| 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; Renard, Vincent; Daniel, Jacques; Dupont, Jacques. |
| The west African continental margin between Abidjan (Ivory Coast) and Walvis Boy (Southwcst Africa) was surveyed in 1971 by the R/V Jean Charcot. Fiftyeight seismic-reflection (flexotir source), bathymetric (3.5 and 12 kc), gravimetric, and magnetic profiles were obtained. The seaward limit of an evaporitic zone outlined during the survey is at the boundary between continental slope and continental rise. Variation of depth of this limit as a function of latitude shows the presence of a large offset at 11°S which seems to be related to an east-east-southeast line of magnetic seamounts cutting into the continental slope. The Annobon-Cameroun volcanic axis separates the salt zones of the Nigerian basin and Congo-Angola basin. The northern limit of Salt... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1973 |
URL: http://archimer.ifremer.fr/doc/1973/publication-5123.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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| 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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| 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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| 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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| 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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| 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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| Registros recuperados: 34 | |
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