Consulta: creatorFacets:"Olivet, Jean-louis"
Registros recuperados: 50
Data/hora: 10/06/2024 07:39:21

Subsidence of the gulf of Lions continental margin (France)
Provedor de dados: 5
Autores: Bache, François; Olivet, Jean-louis; Rabineau, Marina; Gorini, C; Baztan, Juan; Aslanian, Daniel.
The Gulf of Lion margin has been created by an Oligo-Aquitanian rifting followed by oceanic accretion in the Provencal basin during the Burdigalian. Two main periods have been detailed in this study. The Messinian event represents a clear marker (between 7 and 5.3 Ma) within the history of the basin. The study of sedimentary geometries on the margin and in the deep basin gave new elements for the understanding of the messinian crisis: • The first element is the identification of a thick detritic series (up to 1000 m) at the transition between the sub aerially eroded shelf and the slope. The base of this series corresponds to the very first event of the Messinian crisis. • The second important element is the identification of a thick stratum of lower...
Tipo: Text
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/acte-4687.pdf

Considérations sur l'origine et la mise en place des ophiolites des Alpes Occidentales : apport de la connaissance des structures océaniques
Provedor de dados: 5
Autores: 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

Structural framework of selected regions of the western mediterranean 1. Valencia basin
Provedor de dados: 5
Autores: Pautot, Guy; Auzende, Jean-marie; Olivet, Jean-louis; Mauffret, Alain.
The alignment of the Balearic Islands, stretching from the Spanish mainland towards the Corsican-Sardinian block, has long intrigued many geologists. Since Suess (1886), we know that the Balearic block (Ibiza, Formentera, and Majorca) is part of the Alpine system. Many authors (Kober, 1914; Staub, 1928; Kober, 1931) have subsequently attempted to comprehensively integrate the history of the Balearic block within the history of the Alpine chain. In this paper, we will use data from marine geology and geophysics to define the location of the Balearic Islands during the diverse phases of distension, shearing, and compression between the European and African plates, which created the present western Mediterranean and the Alpine chain. In particular, we will...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1972
URL: http://archimer.ifremer.fr/doc/1972/publication-5035.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

Sampling and observation of oceanic mantle and crust on gorringe bank
Provedor de dados: 5
Autores: Auzende, Jean-marie; Olivet, Jean-louis; Charvet, J; Le Lann, Alain; Le Pichon, Xavier; Monteiro, Jh; Nicolas, Anne; Ribeiro, A.
THE structure and nature of the uppermost oceanic mantle and crust has been, and still is, the subject of a major international research effort . Yet the direct field evidence known to us on this subject, whether obtained by drilling in the I.P.O.D. oceanic crust programme² or by submersible surveying in the Famous programme , has been either very incomplete or limited to the upper part of layer 2. As a result, the problem of the comparison between ophiolites and oceanic crust is still debated . We report here the preliminary results of an in situ geological survey in which we have sampled and observed what we believe to be an almost complete geological section starting a few kilometres below the Moho discontinuity and ending in the upper part of layer 2...
Tipo: Text
Ano: 1978
URL: http://archimer.ifremer.fr/doc/1978/publication-5230.pdf

Panafrican events within the Adrar Souttouf Massif (Moroccan Mauritanides).
Provedor de dados: 5
Autores: Villeneuve, Michel; Bellon, Hervé; El Archi, A; Sahabi, M; Rehault, Jean Pierre; Olivet, Jean-louis; Aghzer, A.
The Adrar Souttouf belt (Western Sahara) lies in the northern part of the Mauritanide belt and was considered as a part of the Hercynian Mauritanian-Appalachian belt. Recently the presence of a Panafrican protolith (595 Ma) was evidenced by the age of inherited zircons from an eclogitic unit and led to consider complex Panafrican events included in the Hercynian belt, as in the central and southern Mauritanide belt. Our new field survey completed by ten K-Ar dating (whole rocks and separate minerals) confirmed that multiphased Panafrican formations outcrop within the center of the Adrar Souttouf massif. Diverse events ranged from ca. 1000 to 500 Ma, some of them being indicative of an oceanic type environment and metamorphism. The 1000 Ma metamorphic event...
Tipo: Text
Palavras-chave: Radiometric datations; Hercynian; Panafrican; Mauritanian belt; Sahara; West Africa; Datations radiochronologiques; Hercynien; Panafricain; Mauritanides; Sahara; Afrique de l'Ouest.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1809.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

Le banc de Gorringe : résultats de la campagne Cyagor (août 1977)
Provedor de dados: 5
Autores: Auzende, Jean-marie; Charvet, Jacques; Le Lann, Alain; Le Pichon, Xavier; Monteiro, José Hippolyte; Nicolas, Adolphe; Olivet, Jean-louis; Ribeiro, Antonio.
Gorringe bank is one of the structures which are found on the Europe-Africa plate boundary. It is located between Tagus abyssal plain in the North and Horseshoe plain in the South. It is oriented NE-SW and is in the exact prolongation of the large "tardi-hercynien" fractures which cross the iberian peninsula and its continental margin. Gorringe bank show two summits just under the sea levels, separated by a saddle. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/1979/publication-5386.pdf

Paleo sea levels reconsidered from direct observation of paleoshoreline position during Glacial Maxima (for the last 500,000 yr)
Provedor de dados: 5
Autores: Rabineau, Marina; Berne, Serge; Olivet, Jean-louis; Aslanian, Daniel; Guillocheau, François; Joseph, Philippe.
The drastic climatic changes which characterise the cooling trend of the last few million years of Earth history led to variations in eustatic sea level that had tremendous impact on the geology and ecology of continental margins. Reconstructing a sea-level curve back in time is not an easy task. Observations of shoreline positions are always a local measurement of Relative Sea Level that needs to be corrected from the effect of tectonic and thermal subsidence, sediment loading, compaction and glacio-hydro isostasy. Extensive studies have been done for the last deglaciation and for the last 100,000 yr cycle. But very few studies deal with position of sea level during earlier cycles, simply because conditions are very rarely favourable for the preservation...
Tipo: Text
Palavras-chave: Mediterranean Sea; Gulf of Lions; Golfe du Lion; Subsidence; Glacial maxima; Climatic cycles; Shoreline position; Glacioeustatism; Sea level amplitudes; Sea level changes.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2253.pdf

La marge sud Baléare et la zone de fracture de l'émile Baudot
Provedor de dados: 5
Autores: Mauffret, A.; Olivet, Jean-louis; Auzende, Jean-marie; Lajat, X.
Sur ces cartes structurales, BOURCART (1960-1962) avait déjà souligné l'importance de la faille de l'"EMILE BAUDOT" dont la longueur dépasse 200 km.  Cet accident conditionne la morphologie et la structure de la marge sud-baléare. [OCR NON CONTRÔLE]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1972
URL: http://archimer.ifremer.fr/doc/1972/publication-5131.pdf

Hotspotting called into question
Provedor de dados: 5
Autores: Aslanian, Daniel; Geli, Louis; Olivet, Jean-louis.
Tipo: Text
Ano: 1998
URL: https://archimer.ifremer.fr/doc/00446/55769/59653.pdf

La marge nord-africaine considérée comme marge active
Provedor de dados: 5
Autores: Auzende, Jean-marie; Bonnin, Jean; Olivet, Jean-louis.
Based on the study of some seismic-reflection profiles, we demonstrate that the identified sedimentary units show a structural anomaly at the bottom of the North-African continental margin compared to the situation observed on the other margins of the western Mediterranean basin: all the deep Messinian and infra-Messinian deposits are subjected to a flexure when reaching the North-African margin; the created depression is filled by the plio-quaternary deposits. This observation, set back in the geodynamic context of the western Mediterranean, leads to the following interpretation: the North-African margin is a very active margin at a very early evolutional stage. The abnormal structure of the gravity field in the considered region confirms this...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1975
URL: http://archimer.ifremer.fr/doc/1975/publication-5473.pdf

Le bassin nord-occidental méditerranéen : structure et évolution
Provedor de dados: 5
Autores: Rehault, Jean-pierre; Olivet, Jean-louis; Auzende, Jean-marie.
Several marine geophysical and geological studies have been recently conducted in the ligurian Sea. Two main structural trends are present : a NE-SW direction is related to creation of the ligurian basin and a NW-SE to the Corso Sardinian microplate drifting. Strong positive magnetic anomalies and volcanic activities are associated with this last direction. Finally the North Western mediterranean Sea post-Oligocene evolution is discussed. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1974
URL: http://archimer.ifremer.fr/doc/1974/publication-5437.pdf

Sedimentary sequences in the Gulf of Lion: A record of 100,000 years climatic cycles
Provedor de dados: 5
Autores: Rabineau, Marina; Berne, Serge; Aslanian, Daniel; Olivet, Jean-louis; Joseph, Philippe; Guillocheau, François; Bourillet, Jean-francois; Le Drezen, Eliane; Granjeon, Didier.
The wide continental shelf of the Gulf of Lion (up to 70 km) has been the object of numerous investigations since the early days of oceanography. Yet, the question of sequences duration, the mechanisms of deposition and factors implied remained unanswered. A study of a very dense grid of Very High Resolution (VHR) seismic reflection (Sparker) data associated with surficial cores both, collected by IFREMER between 1992 and 2001 on the outer shelf and upper slope offshore of Sète in the Languedoc region gives a new insight into these issues. Analysis of the 3D geometry of the sedimentary record reveals a basic depositional pattern consisting of a pair of horizontally juxtaposed and downlapping prisms. Prism PI with low angle clinoforms (&lt;1°) lies on the...
Tipo: Text
Palavras-chave: Stratigraphic modelling; Cores; High resolution seismic data; Glacioeustatism; Climatic cycles; Gulf of Lion; Western Mediterranean.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-368.pdf

An alternative early opening scenario for the Central Atlantic Ocean
Provedor de dados: 5
Autores: Labails, Cinthia; Olivet, Jean-louis; Aslanian, Daniel; Roest, Walter.
The opening of the Central Atlantic Ocean basin that separated North America from northwest Africa is well documented and assumed to have started during the Late Jurassic. However, the early evolution and the initial breakup history of Pangaea are still debated: most of the existing models are based on one or multiple ridge jumps at the Middle Jurassic leaving the oldest crust on the American side, between the East Coast Magnetic Anomaly (ECMA) and the Blake Spur Magnetic Anomaly (BSMA). According to these hypotheses, the BSMA represents the limit of the initial basin and the footprint subsequent to the ridge jump. Consequently, the evolution of the northwest African margin is widely different from the northeast American margin. However, this setting is in...
Tipo: Text
Palavras-chave: Central Atlantic Ocean; Mesozoic reversals; Volcanism; Fracture zones; Spreading asymmetry; Plate reconstructions.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00014/12533/17926.pdf

The "lost Inca Plateau": cause of flat subduction beneath Peru?
Provedor de dados: 5
Autores: Gutscher, Marc-andre; Olivet, Jean-louis; Aslanian, Daniel; Eissen, Jp; Maury, Rene.
Since flat subduction of the Nazca Plate beneath Peru was first recognized in the 1970s and 1980s a satisfactory explanation has eluded researchers. We present evidence that a lost oceanic plateau (Inca Plateau) has subducted beneath northern Peru and propose that the combined buoyancy of Inca Plateau and Nazca Ridge in southern Peru supports a 1500 km long segment of the downgoing slab and shuts off arc volcanism. This conclusion is based on an analysis of the seismicity of the subducting Nazca Plate, the structure and geochemistry of the Marquesas Plateau as well as tectonic reconstructions of the Pacific¿Farallon spreading center 34 to 43 Ma. These restore three sub¿parallel Pacific oceanic plateaus; the Austral, Tuamotu and Marquesas, to two Farallon...
Tipo: Text
Palavras-chave: Nazca Plate; Subduction; Nazca Ridge; Peru; Reconstruction.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/publication-360.pdf

Nature du contact Sardaigne-Tunisie. son role tectonique
Provedor de dados: 5
Autores: Auzende, Jean-marie; Olivet, Jean-louis; Bonnin, Jean.
The analysis of the geological and geophysical data on the North African basin and its edges highlighted the importance of a group of accidents in the NE-SW direction, embodied by the Alboran and Emile-Baudot ridges and the northern Tunisian fracture zone. A recent work (Auzende et al., London, Feb. 1972) showed that this family of accidents could be interpreted as a unique system of transforming faults linked to the creation of the North African basin.
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1972
URL: http://archimer.ifremer.fr/doc/1972/publication-5126.pdf

Sur quelques datations du volcanisme alcalin de la ligne Açores-Gibraltar et leur contexte géodynamique
Provedor de dados: 5
Autores: Feraud, Gilbert; Bonnin, Jean; Olivet, Jean-louis; Auzende, Jean-marie; Bougault, Henri.
Ages of a few rocks sampled in three sites of the Azores-Gibraltar ridge have heen determined using the K/Ar method.For one site (Gorringe hank), both whole rock and separated mineral techniques have heen used: ages are compared and discussed. All the dated samples are younger than the adjacent ocean floor whose age is evaluated from the observed magnetic anomalies.For the Gorringe bank samples, ages do not coincide with the generally accepted age for the uplift of this portion of the ocean floor. [NOT CONTROLLED OCR]
Tipo: Text
Ano: 1977
URL: http://archimer.ifremer.fr/doc/1977/publication-5214.pdf

La méditerranée occidentale depuis l'oligocène, schéma d'évolution
Provedor de dados: 5
Autores: 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

Evolution of rifted continental margins: The case of the Gulf of Lions (Western Mediterranean Basin)
Provedor de dados: 5
Autores: Bache, Francois; Olivet, Jean-louis; Gorini, Christian; Aslanian, Daniel; Labails, Cinthia; Rabineau, Marina.
The formation of rifted continental margins has long been explained by numerous physical models. However, field observations are still lacking to validate or constrain these models. This study presents major new observations on the broad continental margin of the Gulf of Lions, based on a large amount of varied data. Two contrasting regions characterize the thinned continental crust of this margin. One of these regions corresponds to a narrow rift zone (40–50 km wide) that was highly thinned and stretched during rifting. In contrast with this domain, a large part of the margin subsided slowly during rifting and then rapidly after rifting. The thinning of this domain cannot be explained by stretching of the upper crust. We can thus recognize a zonation of...
Tipo: Text
Palavras-chave: Subsidence; Passive margins; Back-arc; Rifting; Erosion; Stretching; Thinning; Western Mediterranean; Gulf of Lions.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00001/11230/7736.pdf

A two-step process for the reflooding of the Mediterranean after the Messinian Salinity Crisis
Provedor de dados: 5
Autores: Bache, Francois; Popescu, Speranta-maria; Rabineau, Marina; Gorini, Christian; Suc, Jean-pierre; Clauzon, Georges; Olivet, Jean-louis; Rubino, Jean-loup; Melinte-dobrinescu, Mihaela Carmen; Estrada, Ferran; Londeix, Laurent; Armijo, Rolando; Meyer, Bertrand; Jolivet, Laurent; Jouannic, Gwenael; Leroux, Estelle; Aslanian, Daniel; Dos Reis, Antonio Tadeu; Mocochain, Ludovic; Dumurdzanov, Nikola; Zagorchev, Ivan; Lesic, Vesna; Tomic, Dragana; Cagatay, M. Namik; Brun, Jean_pierre; Sokoutis, Dimitrios; Csato, Istvan; Ucarkus, Gulsen; Cakir, Ziyadin.
The Messinian Salinity Crisis is well known to have resulted from a significant drop of the Mediterranean sea level. Considering both onshore and offshore observations, the subsequent reflooding is generally thought to have been very sudden. We present here offshore seismic evidence from the Gulf of Lions and re-visited onshore data from Italy and Turkey that lead to a new concept of a two-step reflooding of the Mediterranean Basin after the Messinian Salinity Crisis. The refilling was first moderate and relatively slow accompanied by transgressive ravinement, and later on very rapid, preserving the subaerial Messinian Erosional Surface. The amplitude of these two successive rises of sea level has been estimated at =500 similar to m for the first rise and...
Tipo: Text
Palavras-chave: Paleo environmental changes; Miocene pliocene boundary; Section marche province; Earliest zanclean age; Desiccated deep basin; Di tetto formations; Northern apennines; Southern France; Decic basin; Depositional environments.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00076/18774/16490.pdf

Campagne CYAGOR - Submersible Cyana - 25 juillet-26 août 1977
Provedor de dados: 5
Autores: Le Lann, Alain; Auzende, Jean-marie; Olivet, Jean-louis.
We present in this paper raw data and preliminary results of CYAGOR dives (July-August 1977) on Gorringe bank (SW Portugal). A series of eight dives with submersible SP 3000 Cyana, from 2 600 to 40 m depth, enabled us to observe the outcrop of the bank flanks, a nearly complete cross-section of oceanic crust and upper mantle. The structure seems to be little affected by fracturing and is slightly rocked to the NE. Cross-sections made during the dives show characteristics similar to those of an ophiolitic complex.
Tipo: Text
Ano: 1979
URL: https://archimer.ifremer.fr/doc/00418/52940/53880.pdf

Miocene of the gulf of Lions (France) : a passive margin ?
Provedor de dados: 5
Autores: Bache, François; Gorini, C; Olivet, Jean-louis; Rabineau, Marina; Rubino, J.l.; Mauffret, A; Lofi, J.
The continental shelf of the "Golfe du Lion" (Gulf of Lions) has been considered for a long time as a privileged place for the study of passive margins. However, the model usually adopted to explain the formation of this type of margin does not apparently fit the subsidence history of the Gulf of Lions. Indeed, the evolution of this basin is characterized by a high subsidence rate, comparable to those of Atlantic margins, although it is only 30 MY old. Previous studies show anomalies in subsidence rate in the Gulf of Lions (Bessis and Burrus, 1986; Bessis, 1984). Seismic data from a dense grid of seismic reflection profiles acquired by the petroleum industry (RM96, LIGO and HR Total profiles) and by IFREMER (Marion and Calmar campaigns) provided by the...
Tipo: Text
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/acte-4683.pdf

Structural framework of selected regions of the western mediterranean
Provedor de dados: 5
Autores: Olivet, Jean-louis; Pautot, Guy; Auzende, Jean-marie.
The Alboran Sea (Figure 1) is a narrow sea (200 km wide), closed on the West by the "Arc of Gibraltar" and opening in the east into the Balearic Basin. The Betic chains extend along its northern border, the Rif chain extends along its southwest border, and its southern border is essentially formed by the Atlas Foreland. The Betico-Rif ensemble forms an arc having divergent structures (dipping away from the Alboran Sea). South of the sea, the Rif structures turn towards the northeast in contact with the autochthonous and semiautochthonous Atlas Foreland. The Rif and the Betic chains are affected by numerous northeast-southwest and northwest-southeast lateral faults whose role seems important (Kornprobst, 1971; Andrieux et al., 1971 ; Jacquin, 1970), but is...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1972
URL: http://archimer.ifremer.fr/doc/1972/publication-5037.pdf

La marge du Grand Banc et la fracture de Terre-Neuve
Provedor de dados: 5
Autores: Auzende, Jean-marie; Olivet, Jean-louis; Bonnin, Jean.
Some seismic and magnetic profiles carried out south of the Big Bank of Newfoundland during the Noratlante cruise show a fracture zone which collapses the continental margin and continues to the south-east towards the Azores. This fracture zone proves evidence of the drift movement of Africa towards the east during the Jurassic or Trias opening of the Atlantic. From the south-east corner of the Big Bank, the fracture zone supports a sediment ridge formed by the underflows and which continues to the meridian 430 West.
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1970
URL: http://archimer.ifremer.fr/doc/1970/publication-4877.pdf

Variations in axial morphology, segmentation, and seafloor roughness along the Pacific-Antarctic Ridge between 56 degrees S and 66 degrees S
Provedor de dados: 5
Autores: Ondreas, Helene; Aslanian, Daniel; Geli, Louis; Olivet, Jean-louis; Briais, Anne.
The spreading rate at the Pacific-Antarctic Ridge (PAR) increases rapidly from 54 mm/yr near Pitman Fracture Zone (FZ) up to 76 mm/yr near Udintsev FZ, resulting in three domains of axial morphology: an axial valley south of Pitman FZ, an axial high north of Saint Exupery FZ, and in between, the transitional domain extends over 650 km. It comprises sections of ridge with an axial valley or an axial high and generally displays a very low cross-sectional relief. It is also characterized by two propagating rifts. Two domains of different seafloor roughness appear south of Udintsev FZ: east of 157 degreesW these two domains are separated by a 1000-km V-shaped boundary. West of 157 degreesW, the boundary approximately coincides with Chron 3a or Chron 4. The...
Tipo: Text
Palavras-chave: Spreading; Segmentation; Geomorphology; Seafloor; Ridge.
Ano: 2001
URL: https://archimer.ifremer.fr/doc/2001/publication-438.pdf

La dépression nord-baléare (Espagne)
Provedor de dados: 5
Autores: 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

The origin of the western Mediterranean basin
Provedor de dados: 5
Autores: Auzende, Jean-marie; Bonnin, Jean; Olivet, Jean-louis.
The evolution of the western Mediterranean basin is considered. The Provence basin results from the Oligocene migration of Corsica and Sardinia southeastwards. The North African basin was created by the dislocation of an 'internal zone plate' by the mechanism invoked by Karig. Lower or middle Miocene squeezing of the internal zones against the North African platform caused ejection of the flysch nappes. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1973
URL: http://archimer.ifremer.fr/doc/1973/publication-5057.pdf

Messinian erosional and salinity crises: View from the Provence Basin (Gulf of Lions, Western Mediterranean)
Provedor de dados: 5
Autores: Bache, Francois; Olivet, Jean-louis; Gorini, Christian; Rabineau, Marina; Baztan, Juan; Aslanian, Daniel; Suc, Jean-pierre.
Though the late Miocene "Messinian Salinity Crisis" has been intensely researched along the circum-Mediterranean basins, few studies have focused on the central part of the Mediterranean Basin and, especially, the pre-salt deposits. To improve our knowledge of the Messinian events, it is imperative to better understand this domain. In this study, we provide a more complete understanding of this central domain in the Provence Basin. We were able to recognize: a) thick marine detrital series (up to 1000 m) derived from the Messinian subaerial erosion which is partly prolongated in the distal part by b) a thick unit of deep marine deposits (up to 800 m) prior to the evaporites; c) a thick presumed alternation of detritals and evaporites (1500 m) below the...
Tipo: Text
Palavras-chave: Erosion; Detrital deposits; Miocene; Provence Basin; Mediterranean; Gulf of Lions; Salinity Crisis; Messinian.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6870.pdf

Modèle d'évolution de la Méditerranée occidentale : mise au point
Provedor de dados: 5
Autores: Auzende, Jean-marie; Bonnin, Jean; Olivet, Jean-louis.
Tipo: Text
Ano: 1977
URL: http://archimer.ifremer.fr/doc/00318/42913/42417.pdf

PLACA: a white box for plate reconstruction and best-fit pole determination
Provedor de dados: 5
Autores: Matias, Luis; Olivet, Jean-louis; Aslanian, Daniel; Fidalgo, Luis.
PLACA was developed as a general purpose computer program for the earth scientist that has to manipulate the rigid plate tectonics theory, from the representation of plate reconstructions to the determination of best-fit poles using magnetic anomalies, fracture zones or volcanic alignments. In the "forward" mode PLACA has the features of most available demonstration software plus the ability of simulating mid-oceanic ridges (MOR) as dynamic segments that move with a fraction of the relative motion between two plates. The movement can be illustrated by the generation of flow lines, plate trajectories and/or pseudo-magnetic anomalies on the ocean floor. The evolution of simple triple junctions of the R-R-R type can also be studied. In the "modifying" mode,...
Tipo: Text
Palavras-chave: Precision; Confidence region; Fortran; Plate tectonics; Tectonophysics.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-788.pdf

Structure et évolution tectonique du bassin d'Alboran
Provedor de dados: 5
Autores: Olivet, Jean-louis; Auzende, Jean-marie; Bonnin, Jean.
The Alboran Sea is made up of two distinct basins. The first one has approximately the shape of a lozenge, surrounded by the arc of Gibraltar and the two thresholds (northern and southern) of Alboran. It is about a hundred kilometres at its largest width. Its average depth is only 1 300 m, that is 1 000 m less than in the Algero-balearic and Provencal basins. The second one is elongated, deeper (1 800 to 2 000 m) and is widely open to the east and northeast on the algero-balearic basin. The route to this latter basin is made through a more marked slope of a gradient of around 500 m and oriented NNE-SSW.
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1973
URL: http://archimer.ifremer.fr/doc/1973/publication-5052.pdf

Quantifying subsidence and isostatic readjustment using sedimentary paleomarkers, example from the Gulf of Lion
Provedor de dados: 5
Autores: Rabineau, Marina; Leroux, Estelle; Aslanian, Daniel; Bache, F.; Gorini, Christian; Moulin, Maryline; Molliex, Stephane; Droz, Laurence; Dos Reis, Antonio; Rubino, J. L.; Guillocheau, Francois; Olivet, Jean-louis.
Passive margins are characterised by an important tectonic and thermal subsidence, which favours a good preservation of sedimentary sequences. This sedimentation in turn enhances the subsidence because of loading effects. We present here a direct method based on sedimentary markers seen on seismic data, to evaluate total subsidence rates from the coast to the outer shelf and to the deep basin in the Gulf of Lion, from the beginning of massive salt deposition up to present day (the last circa 6 Ma) with minimal theoretical assumptions.  On the shelf, the Pliocene-Quaternary subsidence shows a seaward tilt reaching a rate of 240 m/Ma (±15 m/Ma) at the shelf break (70 km from the present day coastline) (i.e. a total angle of rotation of 0.88° (0.16°/Ma)). We...
Tipo: Text
Palavras-chave: Subsidence; Pliocene-quaternary; Messinian salinity crisis; Isostasy; Mediterranean Sea; Gulf of Lion.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00171/28176/32147.pdf

La faille transformante Gibbs entre le Rift et la marge du Labrador
Provedor de dados: 5
Autores: 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

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

Géologie dynamique - Les orientations structurales et magnétiques sous-marines au sud de la corse et la dérive corso-sarde
Provedor de dados: 5
Autores: 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

Structural framework of selected regions of the western mediterranean 2. Balearic islands : southern prolongation
Provedor de dados: 5
Autores: 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

Axial incision: The key to understand submarine canyon evolution (in the western Gulf of Lion)
Provedor de dados: 5
Autores: Baztan, Juan; Berne, Serge; Olivet, Jean-louis; Rabineau, Marina; Aslanian, Daniel; Gaudin, Mathieu; Rehault, Jean Pierre; Canals, M.
A detailed morphological analysis of the outer shelf and continental slope of the Western Gulf of Lion is presented, based on swath bathymetry data together with sub-bottom profiles and high resolution seismic reflection profiles. These data reveal two main erosive features, of very different dimensions: the axial incision and the canyon's major valley. The height of axial incisions' flanks with respect to the canyon deepest point (the thalweg) ranges from 40 to 150 m. It creates a small axial erosive path within the canyon's major valley, which is typically bounded by flanks of more than 700 m in height. We interpret the axial incision observed in the sea floor as the imprint of turbidity currents that eroded the floor of canyons during phases of...
Tipo: Text
Palavras-chave: Submarine canyon; Axial incision; Gulf of Lion.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-353.pdf

Geological constraints on the evolution of the Angolan margin based on reflection and refraction seismic data (ZaïAngo project)
Provedor de dados: 5
Autores: Moulin, Maryline; Aslanian, Daniel; Olivet, Jean-louis; Contrucci, Isabelle; Matias, Luis; Geli, Louis; Klingelhoefer, Frauke; Nouze, Herve; Rehault, Jean Pierre; Unternehr, Patrick.
Deep penetration multichannel reflection and Ocean Bottom Seismometer wide-angle seismic data from the CongoAngola margin were collected in 2000 during the ZaïAngo cruise. These data help constrain the deep structure of the continental margin, the geometry of the pre-salt sediment layers and the geometry of the Aptian salt layer. Dating the deposition of the salt relative to the chronology of the margin formation is an issue of fundamental importance for reconstructing the evolution of the margin and for the understanding of the crustal thinning processes. The data show that the crust thins abruptly, from a 3040 km thickness to less than 10 km, over a lateral distance of less than 50 km. The transitional domain is a 180-km-wide basin. The pre-salt sediment...
Tipo: Text
Palavras-chave: Deep seismic reflection and refraction; Sub salt imaging; Transitional domain; Crustal structure; Non volcanic passive continental margin.
Ano: 2005
URL: https://archimer.ifremer.fr/doc/2005/publication-349.pdf

Crustal structure of the SW-Moroccan margin from wide-angle and reflection seismic data (the DAKHLA experiment) Part A: Wide-angle seismic models
Provedor de dados: 5
Autores: Klingelhoefer, Frauke; Labails, Cinthia; Cosquer, Emmanuel; Rouzo, Stephane; Geli, Louis; Aslanian, Daniel; Olivet, Jean-louis; Sahabi, M.; Nouze, Herve; Unternehr, P.
A total 1500 km of seismic reflection and wide-angle profiles were acquired off the southern Moroccan margin during the DAKHLA cruise, a joint project of Ifremer, the Universities of Brest, El Jadida and Lisbon and Total. The shots along two profiles parallel to the margin and two profiles perpendicular to the margin were also recorded by ocean bottom seismometers (OBS). The profiles perpendicular to the margin were additionally extended on land using 14 stations on the northern profile and 11 stations on the southern profile. Modelling of the reflection and wide-angle seismic data reveals a 10 km deep sedimentary basin including two high velocity carbonate layers. Lateral crustal thinning is observed from a 27 km thick crystalline continental crust to a 7...
Tipo: Text
Palavras-chave: Ocean continent transition; Keyword wide angle seismic; Southern Moroccan margin.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6410.pdf

La crise de la salinité messinienne dans le Golfe du Lion : de la marge érodée au bassin évaporitique
Provedor de dados: 5
Autores: Bache, Francois; Gorini, C; Olivet, Jean-louis; Rabineau, Marina; Aslanian, Daniel; Baztan, Juan; Moulin, Maryline.
The Messinian erosional surface that can be observed on the Mediterranean margins is a good marker of the relative lowering of the sea level which happened during the Messinian salinity crisis. The estimate of the volume of Miocene sediments on the Gulf of Lion platform gives a minimum eroded volume of 5 300 Km . The eroded layer reaches one kilometre in numerous places (Figures 2 and 3). This volume demonstrates the erosion of the continental shelf in the Gulf of Lion and does not include the eroded volumes in the Rhone valley, the surroundings of the Gulf of Lion and on the slope. Thus, this minimum eroded volume is logically transferred towards the basin.
Tipo: Text
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/acte-4680.pdf

Upper miocene salt layer in the western mediterranean basin
Provedor de dados: 5
Autores: Auzende, Jean-marie; Bonnin, Jean; Olivet, Jean-louis; Pautot, Guy; Mauffret, Alain.
"Flexotir" profiles in the Western Mediterranean Basin reveal a uniform salt layer, overlain by a sedimentary sequence affected by diapirism. The salt has been given an Upper Miocene age. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1971
URL: http://archimer.ifremer.fr/doc/1971/publication-4889.pdf

Messinian Events: View from the Provence Basin (Gulf of Lion,Western Mediterranean)
Provedor de dados: 5
Autores: Bache, François; Gorini, C; Olivet, Jean-louis; Rabineau, Marina; Aslanian, Daniel; Suc, J.p.
Though the late Miocene "Messinian Salinity Crisis" has been intensely researched along the circum- Mediterranean basins, few studies have focused on the central part of the Mediterranean Basin and, especially, the pre-salt deposits. Within the Western Mediterranean, the Gulf of Lion is exceptional in that its sedimentary strata have not been significantly deformed. In addition, the Gulf of Lion is characterized by a relatively constant subsidence with continuous accommodation space for sediment accumulation. This configuration, together with the availability of a wealth of offshore information (seismic profiles, boreholes), enables us to precisely describe the sedimentary geometries on the margin and in the central basin. This study gives new elements for...
Tipo: Text
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/acte-6942.pdf

40 AR/39 AR ages for the alkaline volcanism and the basement of Gorringe Bank, North atlantic Ocean
Provedor de dados: 5
Autores: 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

Le banc de gorringe (sud-ouest du portugal), un fragment de manteau et de croûte océanique reconnu par submersible
Provedor de dados: 5
Autores: Auzende, Jean-marie; Charvet, J; Le Lann, Alain; Lepichon, X; Monteiro, Jh; Nicolas, Anne; Olivet, Jean-louis; Ribeiro, A.
An almost complete geological section of the oceanic crust and upper mantle outcropping on the flanks of the Gorringe Bank has been surveyed during eight dives of SP 3000 Cyana submersible. The section which is slightly tilted to the east bears a close resemblance to an ophiolitic complex. [NOT CONTROLLED OCR]
Tipo: Text
Ano: 1977
URL: http://archimer.ifremer.fr/doc/1977/publication-5219.pdf

La fracture Gibbs et la circulation profonde en Atlantique Nord
Provedor de dados: 5
Autores: Olivet, Jean-louis; Le Pichon, Xavier; Laubier, Lucien.
The cold waters from the Norwegian Sea are the main source of the underflow system in the northern Atlantic Ocean (10) (pl. 1, fig. 1b). The role of these currents in the formation of large sediment ripples has been demonstrated in some recent studies [(2), (3)]. As in the southern Atlantic Ocean, the observations suggested that their influence had been of importance since the Eocene era (6). From a sedimentological point of view, it appears that the Gibbs fracture (4) represents a very important feature in this system; this structure both forms a deep opening through the Mid-Atlantic Ridge and a dam across the abyssal plain to the northeast of Newfoundland. This dam, which is still active today, though partly flooded, must have been continuous from the...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1970
URL: http://archimer.ifremer.fr/doc/1970/publication-4882.pdf

A new starting point for the history of the central Atlantic
Provedor de dados: 5
Autores: Sahabi, Mohamed; Aslanian, Daniel; Olivet, Jean-louis.
A new starting point for the history of the central Atlantic. The first oceanic crust in the central Atlantic is usually thought to have a Middle Jurassic age. The new interpretation of the two key parameters, the African homologue of the East Coast Magnetic Anomaly and the situation of the Triassic salt basin of Morocco and Novia Scotia, shows that this age was underestimated by about 20 Ma. In our kinematic reconstruction, the first oceanic crust begins at the Late Sinemurian. This difference in age is crucial for the evolution of those margins and we discuss here its consequences.
Tipo: Text
Palavras-chave: Cinématique; Bassin à évaporites; Anomalie magnétique; Atlantique central; Cinematic; Salt basin; Magnetic anomaly; Central Atlantic.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-437.pdf

Messinian evaporite deposition during sea level rise in the Gulf of Lions (Western Mediterranean)
Provedor de dados: 5
Autores: Bache, Francois; Gargani, Julien; Suc, Jean-pierre; Gorini, Christian; Rabineau, Marina; Popescu, Speranta-maria; Leroux, Estelle; Do Couto, Damien; Jouannic, Gwenael; Rubino, Jean-loup; Olivet, Jean-louis; Clauzon, Georges; Dos Reis, Antonio Tadeu; Aslanian, Daniel.
The Messinian Salinity Crisis resulted from desiccation of the Mediterranean Sea after its isolation from the Atlantic Ocean at the end of the Miocene. Stratal geometry tied to borehole data in the Gulf of Lions show that the pre-crisis continental shelf has been eroded during a major sea-level fall and that sediments from this erosion have been deposited in the basin. This detrital package is onlapped by high amplitude seismic reflectors overlain by the “Messinian Salt” and the “Upper Evaporites”. Towards the shelf, the transition between regressive deposits and overlying onlapping sediments is characterised by a wave-ravinement surface, suggesting that a significant part of the onlapping reflectors and overlying Messinian Evaporites were deposited during...
Tipo: Text
Palavras-chave: Messinian; Mediterranean; Gulf of Lions; Seismic stratigraphy; Evaporites.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00248/35887/34408.pdf

Une structure compressive au nord de l'Algérie?
Provedor de dados: 5
Autores: Auzende, Jean-marie; Olivet, Jean-louis; Bonnin, Jean.
From the study of continuous seismic reflection profiles (Flexotir) we have revealed a marked morphological contrast between the Northern Algerian margin and the other margins of the Balearic basin. Such a difference is made particularly clear by a downwarping of the sedimentary layers at the limit of the Algerian margin. This downwarping could be explained by the existence of a trench being formed by compression. [NOT CONTROLLED OCR]
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1972
URL: http://archimer.ifremer.fr/doc/1972/publication-4895.pdf

Structure en nappe à l'Ouest de Gibraltar
Provedor de dados: 5
Autores: Bonnin, Jean; Olivet, Jean-louis; Auzende, Jean-marie.
A partir de l'analyse de profils de sismique réflexion, il apparaît que les nappes de glissement du Rharb et du Guadalquivir ont une grande extension dans le domaine marin adjacent où elles atteignent vers l'Ouest les plaines abyssales de Seine et du Fer à Cheval. A terre comme en mer, la mise en place des nappes a eu lieu au Tortonien. [OCR NON CONTRÔLE]
Tipo: Text
Ano: 1975
URL: http://archimer.ifremer.fr/doc/1975/publication-5466.pdf