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40 AR/39 AR ages for the alkaline volcanism and the basement of Gorringe Bank, North atlantic Ocean ArchiMer
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
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A new starting point for the history of the central Atlantic ArchiMer
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
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A two-step process for the reflooding of the Mediterranean after the Messinian Salinity Crisis ArchiMer
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
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An alternative early opening scenario for the Central Atlantic Ocean ArchiMer
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
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Axial incision: The key to understand submarine canyon evolution (in the western Gulf of Lion) ArchiMer
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
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Considérations sur l'origine et la mise en place des ophiolites des Alpes Occidentales : apport de la connaissance des structures océaniques ArchiMer
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
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Crustal structure of the SW-Moroccan margin from wide-angle and reflection seismic data (the DAKHLA experiment) Part A: Wide-angle seismic models ArchiMer
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
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Description géologique de la bordure provençale ArchiMer
Olivet, Jean-louis; Auzende, Jean-marie; Mascle, Jean; Monti, S.; Pastouret, Léo; Pautot, Guy.
Recent data on the western Mediterranean basin (Joides cruise, Montadert et al., 1970, Auzende et al., 1971, Le Borgne et al., 1971) and its connection with the evolution of the Atlantic area (Le Pichon et al., 1970, Talwani et al., 1971, Le Pichon et al. in writing) lead us, like other authors (Dubourdieu, 1962, Stanley and Mutti, 1968, Ryan, 1969 amongst others) to admit the theory of an opening of the Algero-provencal basin during the Cenozoic era. A series of arguments drove us to formulate the hypothesis of an Oligocene age (in process). This work is in line with this perspective. [...]
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1971 URL: http://archimer.ifremer.fr/doc/1971/publication-4907.pdf
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Evolution of rifted continental margins: The case of the Gulf of Lions (Western Mediterranean Basin) ArchiMer
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
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Geological constraints on the evolution of the Angolan margin based on reflection and refraction seismic data (ZaïAngo project) ArchiMer
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
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Géologie dynamique - Les orientations structurales et magnétiques sous-marines au sud de la corse et la dérive corso-sarde ArchiMer
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
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Hotspotting called into question ArchiMer
Aslanian, Daniel; Geli, Louis; Olivet, Jean-louis.
Tipo: Text
Ano: 1998 URL: https://archimer.ifremer.fr/doc/00446/55769/59653.pdf
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La crise de la salinité messinienne dans le Golfe du Lion : de la marge érodée au bassin évaporitique ArchiMer
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
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La dépression nord-baléare (Espagne) ArchiMer
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
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La faille transformante Gibbs entre le Rift et la marge du Labrador ArchiMer
Olivet, Jean-louis; Sichler, Bertrand; Thonon, Pierre; Le Pichon, Xavier; Martinais, Guy; Pautot, Guy.
The Gibbs fracture moves the central Rift of the Mid-Atlantic Ridge 370 km to the left at latitude 53O north. It is the only fracture located between Europe and America that can be compared to the large equatorial fractures mapped by B.C. Heezen and M. Tharp between Africa and America. Its morphology is a major element in the understanding of the structural framework of the northern Atlantic Ocean. The identification of its extension to the west was one of the proposed focuses for the first Noratlante expedition of the R.V. Jean-Charcot (conducted in August 1969 under the authority of the C.N.E.X.O.). J.T. Wilson (2) suggested, in his hypothesis of sea-bed spreading from the dorsal axis, that such fractures are "transforming faults" that are active only...
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1970 URL: http://archimer.ifremer.fr/doc/1970/publication-4875.pdf
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La fracture Gibbs et la circulation profonde en Atlantique Nord ArchiMer
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
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La marge du Grand Banc et la fracture de Terre-Neuve ArchiMer
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
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La marge nord-africaine considérée comme marge active ArchiMer
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
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La marge sud Baléare et la zone de fracture de l'émile Baudot ArchiMer
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
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La méditerranée occidentale depuis l'oligocène, schéma d'évolution ArchiMer
Le Pichon, Xavier; Pautot, Guy; Auzende, Jean-marie; Olivet, Jean-louis.
The evolution of the Western Mediterranean basin during Tertiary time is discussed. It is proposed that it was created by a continental drift process during Middle Oligocene time, synchronously with the creation of the grabens over the continents. The significance of the Messinian evaporitic sedimentary episode is discussed in liaison with the problem of large scale subsidence which has been at least six kilometers since Oligocene time. [NOT CONTROLLED OCR]
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1971 URL: http://archimer.ifremer.fr/doc/1971/publication-4921.pdf
Registros recuperados: 49
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