Consulta: creatorFacets:"Pastouret, Léo"
Registros recuperados: 23
Data/hora: 01/06/2024 17:39:58

Dredged rocks from the armorican and celtic margins
Provedor de dados: 5
Autores: Auffret, Gérard-andré; Pastouret, Léo; Cassat, G.; De Charpal, O.; Cravatte, J.; Guennoc, P.
This report presents the preliminary results of the study of rocks and sediments obtained by dredging during four cruises of the R/V Jean Charcot and R/V Le Suroît during a cooperative program between CNEXO and CEPM (CH 58 : April 1975 ; SU 01 : December 1975 ; CH 66 : February 1976 ; and CH 67 : March 1976). A bathymetric map of the margins under study, as well as the location of the 27 dredges considered in this report, are presented in Figures 1 and 2, respectively. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/1979/publication-5255.pdf

Upper cretaceous to quaternary sedimentary process in the bay of biscay from textural, mineralogical, and coarse fraction studies
Provedor de dados: 5
Autores: Auffret, Gérard-andré; Pastouret, Léo.
The evolution of the sedimentary regime that prevailed on the Armorican margin from Late Cretaceous to late Tertiary is herein discussed and interpreted. The sedimentation budget of four components of the sediment : calcium carbonate, quartz, "less than 10  m non carbonate material,"and biogenic silica are quantified as is the composition of the coarse fraction and the textural properties of the sediment. Variation of the coarse fraction components is directly related to change in the oceanic environment (terrigenous supplies, productivity, calcium carbonate dissolution). Sediment texture is a function of many factors, comprising lithology, dissolution action, and hydrodynamic control. The medians of the silt fractions from bulk and decalcified sediments...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/1979/publication-5256.pdf

Remarques complémentaires sur le Néogène de la mer d'Alboran
Provedor de dados: 5
Autores: Pastouret, Léo; Olivet, Jean-louis; Auzende, Jean-marie; Rehault, Jean-pierre.
The existence of a discontinuity in the marine series between late Miocene and lower Pliocene in the Alboran sea has been put to light by the study of sedimentological, stratigraphical and geophysical data. This discontinuity consists of an evaporitic and salt layer in the deep parts of the basin, and of a stratigraphic hiatus near drill site 121 of Glomar Challenger. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1975
URL: http://archimer.ifremer.fr/doc/1975/publication-5096.pdf

Description géologique de la bordure provençale
Provedor de dados: 5
Autores: 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

Présence de pillow-lavas tholéiitiques dans le canyon Shamrock (marge continentale armoricaine) ; leur place dans l'histoire du golfe de Gascogne
Provedor de dados: 5
Autores: Pastouret, Léo; Maury, René C.
Tipo: Text
Ano: 1982
URL: http://archimer.ifremer.fr/doc/00311/42184/41484.pdf

Sur les modalités de la sédimentation profonde actuelle dans le golfe de Gascogne
Provedor de dados: 5
Autores: Auffret, Gérard-andré; Pastouret, Léo.
Knowledges concerning the nature and distribution of present day sedimentary facies on the slope and in the Biscay abyssal plain are very poor, due to the scarcity of available sea-floor samples.Samples from the uppermost section of Reineck cores obtained in six areas of the Bay of Biscay in water depths ranging from 2,000 to 4,800 m allow us to study the evolution of the sediments according to the water depth and geographic localisation.This study suggests that the sediment from the southern part of the bay independently of depth are characterized by a higher amount in terrigenous components (quartz, clay ...).This disparity is explained by the differing phyisiographic setting (broad shelf in the northern part versus narrow shelf and submarine canyon...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1977
URL: http://archimer.ifremer.fr/doc/1977/publication-5201.pdf

56. Morphology and Basement Structures of the Goban Spur Continental Margin (Northeastern Atlantic) and the Role of the Pyrenean Orogeny
Provedor de dados: 5
Autores: 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

Sur la présence d'Aptien inférieur à faciès urgonien sur la marge continentale armoricaine. Conséquences paléogéographiques
Provedor de dados: 5
Autores: Pastouret, Léo; Masse, Jean-pierre; Philip, Jean; Auffret, Gérard-andré.
During the Secondary and Tertiary periods, the northern continental margin of the Bay of Biscay was the scene of some subsidence phenomena which lowered the continental blocks through faults. This was mainly observed off the coast of Brittany and at the entrance of the English Channel [(2), (3)]. During the Géogas cruise of the research vessel "Jean-Charcot" (October 1972), samples were taken from the Mériadzek scarp which forms one of these blocks. A dredging conducted on the southern limb of this structure (pl.) enabled the sampling of some sedimentary rocks among which some fragments of a yellow limestone containing a fauna of rudists could be found.
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1974
URL: http://archimer.ifremer.fr/doc/1974/publication-5435.pdf

Sédimentation profonde au large du delta du Niger (golfe de guinée)
Provedor de dados: 5
Autores: Thiede, Jörn; Pastouret, Léo; Melguen, Marthe.
L'analyse des sédiments d'une carotte prélevée sur une colline sous-marine du golfe de Guinée a montré que les niveaux les plus anciens se seraient mis en place lors de la dernière période interpluviale vers 220 000 ans BP.  Les fluctuations des masses d'eau continentales et dessalées ont fortement influencé les processus sédimentaires. [OCR NON CONTRÔLE]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1974
URL: http://archimer.ifremer.fr/doc/1974/publication-5162.pdf

Recent mass wasting processes on the provencal margin (western mediterranean)
Provedor de dados: 5
Autores: Auffret, Gérard-andré; Auzende, Jean-marie; Gennesseaux, M.; Monti, S.; Pastouret, Léo; Pautot, G.; Vanney, J.r.
On October 19, 1979 off Nice, the upper continental shelf has been affected by a catastrophic event (Gennesseaux et al., 1980). (a) At 2 p.m. (approximate time), following a lowering of the sea level, a tsunami of several meters amplitude reached the Coast line south of Antibes. This was followed during 4 hours by several oscillations of decreasing amplitude, that were felt on a shore length of about 100 km. (b) About the same time, an embanked area 300 m long and wide, collapsed in a few seconds ; after the event the sea-floor in that area was found at a depth of 50 meters. (c) At 17h45 TU and 22h00 TU, two telephone cables have been broken 80 and 110 km off Nice respectively (fig. 1). (d) No earthquake was registered by the Monaco Observatory during this...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/publication-5354.pdf

Seismic stratigraphy and related lithofacies of the blake-bahama basin
Provedor de dados: 5
Autores: E.sheridan, Robert; Pastouret, Léo; Mosditchian, Georges.
The seismic stratigraphy of the Blake-Bahama Basin is interesting because of the apparent acoustic blanking of the deeper reflectors.The blanking is caused by shallow high impedance layers, diffractions at shallow hyperbolic reflectors, and velocity inversions. Only recently have high-energy multichannel seismic techniques been employed in the basin to reveal the true configuration of the deeper reflectors and the extent of the blanking (Figure 1). In 1974 a cooperative U.S. Geological Survey-Institut Français du Pétrole cruise aboard R/V Florence collected three profiles, FC I, II, III, using a 24-fold Flexichoc system (Dillon et al., 1976).DSDP Site 391 was selected on the basis of these U.S.G.S.-I.F.P.seismic data. A survey aboard R/V Conrad was made in...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1978
URL: http://archimer.ifremer.fr/doc/1978/publication-5212.pdf

La marge continentale armoricaine, résultats d'observations en submersible et de dragages dans le canyon Shamrock
Provedor de dados: 5
Autores: Pastouret, Léo; Auffret, Gérard-andré; Auzende, Jean-marie; Beuzart, Paul; Dubois, Paul; Seguret, Michel; Sigal, Jacques; Vanney, Jean-rené.
Observations gathered with Cyana submersible and dredge sampling in the Shamrock canyon area during the CYMOR cruise allow us to specify the geological evolution of this part of the northern Bay of Biscay margin.  At least during the Lower Cretaceous (Neocomian to Albian) there existed a subsident basin limited by highs.  The hiatus located between Albian and Tertiary formations indicates that this process was interrupted during the Late Cretaceous by a possible tectonic event.  From the Oligocene the sedimentation became turbiditic. Active erosion processes on the canyon flanks and turbiditic massive flows have been observed. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/publication-5331.pdf

Les bassins sédimentaires de la mer d'Alboran
Provedor de dados: 5
Autores: Auzende, Jean-marie; Pastouret, Léo; Olivet, Jean-louis; Rehault, Jean-pierre; Szep, Bela.
The study of seismic profiles (made with Sparker and with air-gun) recorded in the Alboran sea helps us to complete and modify an interpretation which was previously made. Further to complementary data on the structural frame, we showed the existence of a salt layer topped with evaporites, in the basins situated on both sides of the Alboran ridges. With regard to the thick infra-salt layer in the western Alboran basin, it appears that the basement of the basin, as a whole, is at a depth similar to the depth of the North-African basin. This supports the hypothesis of a common origin and evolution for both basins. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1975
URL: http://archimer.ifremer.fr/doc/1975/publication-5464.pdf

Influence of the prevailing current regime on sedimentation in the Alboran Sea
Provedor de dados: 5
Autores: Auffret, Gérard-andré; Pastouret, Léo; Chamley, Hervé; Lanoix, Franz.
The extent to which the prevailing current regime controls the nature of surface sediments in the Alboran Sea is suggested.  Hydrographic data and surface sediments collected during the Polymède II cruise of the R.V. Jean Charcot in 1972 strongly suggest that the sediment distribution is controlled by the current system resulting from the difference in density between the Intermediate and Deep Mediterranean Water and Atlantic Surface Water.  Clay, mainly montmorillonite, and planktonic Foraminifera are carried into the Mediterranean by east-flowing Atlantic Surface Water. As the suspended particles settle through the water column, they are redistributed by the westward-flowing deep currents and accumulate on the floor of the sea,  where they constitute a...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1974
URL: http://archimer.ifremer.fr/doc/1974/publication-5158.pdf

Pacifique est-équatorial: précisions sur la biostratigraphie du pléistocène supérieur
Provedor de dados: 5
Autores: Volat, Jean-louis; Pastouret, Léo.
From observations made on four piston cores located in the eastern equatorial Pacific, Globoquadrina pseudofoliata, a local marker, became extinct around 300.000 years B.P.; Globigerina calida calida appeared at about 180,000 years B.P.; East of the 1 10th meridian, a pronounced peak in the frequency of Globorotalia inflata occurred at 40.000 years B.P. There is a large overlap of Globoquadrina conglomerata and Gq. pseudofoliata.Globorotalia crassaformis hessi, a tropical Atlantic marker, did occur in the Pacific. The stratigraphic range of four other species is also discussed. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1978
URL: http://archimer.ifremer.fr/doc/1978/publication-5220.pdf

Évolution sédimentaire comparée des marges armoricaines et de Blake-Bahama depuis le Crétacé supérieur, d'après les résultats des Legs 48 et 44 du Glomar Challenger
Provedor de dados: 5
Autores: Auffret, Gérard-andré; Pastouret, Léo.
We compare the post-lower Cretaceous sedimentary evolution on the Armorican and Blake Plateau continental margins. This comparison is based on lithological studies made on sediments from legs 44 and 48 of D.V. Glomar Challenger. These studies (mineralogy, textures, coarse fraction observation) and the consideration of the accumulation rates for each components, allow us to establish the similarity between the sedimentary regime on both margins. We notice particulary the simultaneous occurrence of a lowermost upper Cretaceous hiatus, reduced accumulation rates during Late Cretaceous and Paleocene ; the instauration of an active bottom current regime during Paleocene and its strengthening during Eocene and Oligocene ;  a drastic incrcase of the accumulation...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1978
URL: http://archimer.ifremer.fr/doc/1978/publication-5236.pdf

Essai de synthèse paléoclimatique
Provedor de dados: 5
Autores: Pastouret, Léo; Chamley, H.; Gaudry, I.
The drill samples collected during the Térébel expedition show some interesting characteristics. First, these samples have been taken from the sedimentary cover at depths of around 40 m, never attained through classical drillings in this area of the Mediterranean Sea; secondly, they have been the focus of a shared study between different disciplines. It seemed interesting to gather in a synthetic chapter the paleoclimatic results provided by palynology, the study of argillaceous minerals and planktonic foraminiferae. Considering, on the one hand, the shortness of the drill samples and the low density of the samples taken from these cores, and, on the other hand, the lack of a precisely-dated reference level, we had to be extremely cautious with our...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1971
URL: http://archimer.ifremer.fr/doc/1971/publication-4905.pdf

Middle Cretaceous sediments from the eastern part of walvis ridge
Provedor de dados: 5
Autores: Pastouret, Léo; Goslin, J.
THE Walvis Ridge is one of the most conspicuous features of the South Atlantic. It extends from near Tristan da Cunha on the Mid-Atlantic Ridge to the African continental margin and has three main segments. The western segment is oriented SW-NE, the central one N-S and the eastern one SSW-NNE. The Walvis Ridge may have kept pace with the opening of the South Atlantic which started in the Early Cretaceous1-6, either by transform fault mechanisms7-8 or by a mantle hot spot and plume 9-12. The eastern segment is thought to have been built throughout the Middle Cretaceous, that is, between 120 m.y. ago and 80 m.y. ago13-15. We report information obtained from an investigation of the age and depositional conditions of sedimentary rock recovered during the Walda...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1974
URL: http://archimer.ifremer.fr/doc/1974/publication-5429.pdf

Microfacies of some sediments from the western north atlantic: paleoceanographic implications (leg 44 dsdp)
Provedor de dados: 5
Autores: Pastouret, Léo; Auffret, Gérard-andré; Chambley, Hervé.
We characterized the microfacies of sediments encountered dunng Leg 44 on the basis of coarse fraction mineralogy (  sup 125  m), silt mineralogy (63 inf   inf 20  m), clay mineralogy (  inf 2  m), silt and clay particle size distributions, and calcium carbonate contents. Secondly we attempted to tentatively correlate microfacies changes with major oceanographic events which have affected the sedimentary processes along the continental margin of North America.Because part of the stratigraphic column was not recovered (no Pliocene and Oligocene, and reduced Pleistocene and Barremian sections), and because of the fairly large sampling intervals our results are far from complete and exhaustive.Some important results, however, concerning the evolution of the...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1978
URL: http://archimer.ifremer.fr/doc/1978/publication-5211.pdf

Sédimentation actuelle et récente en mer d'Alboran
Provedor de dados: 5
Autores: Auffret, Gérard-andré; Pastouret, Léo; Cavanie, Alain; Lanoix, F.
Three processes are called to explain the deposition of hemipelagic muds accounting for around 95 % of deposits in the Alboran Sea during the Holocene: general currents, distal part of a turbidite current, or a combination of these two causes a "gravity-assisted bottom current". We will discuss these hypotheses based on the results of the study of superficial sediment samples and the current measurements conducted during the Polymède II cruise (April-May 1972) by the R.S. "Jean Charcot", as well as on recent works about this region's hydrology (Lanoix, 1972).
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1972
URL: http://archimer.ifremer.fr/doc/1972/publication-5127.pdf

Conclusions sur la détermination de la microfaune
Provedor de dados: 5
Autores: Le Calvez, Y.; Pastouret, Léo.
The analysis of cores taken during the drilling operation of the Terebel's cruise in the northwestern Mediterranean Sea has put into evidence some reworked sediments. However, the occurence of Gtobigerina pachyderma, Gtoborotatia truncatutinoides and Hyalinea balthica gives a quaternary age to these deposits (not older than Sicilian). The microfauna variations in some cores are related to paleoclimatological changes. Some of the sedimentary levels were deposited during a warming interglacial period. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1971
URL: http://archimer.ifremer.fr/doc/1971/publication-4904.pdf

Towards a quaternary time scale
Provedor de dados: 5
Autores: Berggren, W.a.; Hays, J.d.; Burckle, L.h.; Kennett, J.p.; Cita, M.b.; Opdyke, N.d.; Cooke, H.b.s.; Pastouret, Léo; Funnell, B.m.; Shackleton, N.j.; Gartner, S.; Takayanagi, Y.
The stratigraphic subdivision of the Quaternary deep-sea record is not only of significance to stratigraphers but also to those who seek to understand processes that are recorded in these sediments :  for example, climatic change and its causes, ocean chemistry and its variation through time, the phenomena of faunal and floral evolution and extinction, and many others. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1978
URL: http://archimer.ifremer.fr/doc/1978/publication-5316.pdf

Observations sur les microfaciès des roches sédimentaires prélevées sur la marge armoricaine
Provedor de dados: 5
Autores: Pastouret, Léo; Auffret, Gérard-andré.
The study of the rock and sediment dredgings carried out on the Armorican margin between 47 and 48° latitude North enables us to precise this latter's paleogeographical and tectonic evolution and to integrate it to the Bay of Biscay's. The microfacies analysis of the rock samples dating back from the Upper Jurassic to the Neogene era demonstrates: - on the one hand, the belonging of the northern edge of the Armorican margin to the Mesogean domain, at least up to the Mid-Cretaceous period; - on the other hand, the persistence of a carbonated platform regime which seems to operate from the Tithonian to the lower Tertiary phase, and on which reef could grow, especially in the Mid-Cretaceous period. Over the whole period, sedimentation compensated for...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1976
URL: http://archimer.ifremer.fr/doc/1976/publication-5100.pdf