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Registros recuperados: 5
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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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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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Messinian event in the black sea: Evidence of a Messinian erosional surface ArchiMer
Gillet, Herve; Lericolais, Gilles; Rehault, Jean Pierre.
In 1975, sediment cores from leg DSDP 42b (sites 380A and 381) revealed a thin sediment layer in the Black Sea basin which points to a shallow water environment at the Miocene-Pliocene boundary. With these facts and in the wake of hypothesis of the Messinian Salinity Crisis (MSC), it was proposed that the Black Sea, like the Mediterranean Sea, suffered a desiccation period at the end of the Messinian (Hsu, K.J. and Giovanoli, F., 1979. Messinian event in the Black Sea. Palaeogeography, Palaeoclimatology, Palaeoecology, 29: 75-93). Whereas the main topics of the MSC in the Mediterranean Sea is now widely accepted, the lack of evidence for a Messinian erosional surface in the Black Sea left the debate about the Messinian desiccation of this basin open until...
Tipo: Text Palavras-chave: Messinian salinity crisis; Seismic stratigraphy; Messinian erosional surface; Black Sea.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3324.pdf
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Panafrican events within the Adrar Souttouf Massif (Moroccan Mauritanides). ArchiMer
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
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Relation between lipid and fatty acid composition of eggs and larval survival in white pacific shrimp (Penaeus vannamei, Boone, 1931) ArchiMer
Palacios, Elena; Rehault, Jean Pierre; Heras, Horacio; Marty, Yannick; Moal, Jeanne; Samain, Jean-francois.
In this study, lipid classes and fatty acid composition were determined in eggs of P. vannamei as a function of survival to zoea III stage. Spawns were reared individually to zoea III and grouped, according to their final survival to this larval stage, into spawns of high and low survival. Eggs of individual spawns were analyzed for lipid and fatty acid composition of neutral and polar lipids and the results were then grouped according to survival to zoea III. The lipids within each group (high and low survival to zoea III) were pooled for the separation of phospholipids and the analysis of their fatty acid composition. Higher levels of triglycerides, carotenoids, and linoleic (18: 2n-6) acid in eggs were associated with improved survival to zoea III....
Tipo: Text Palavras-chave: Triglycerides; Phospholipid; Larval quality; Larval culture; Carotenoid.
Ano: 2001 URL: https://archimer.ifremer.fr/doc/2002/publication-786.pdf
Registros recuperados: 5
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