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Registros recuperados: 6
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Evidence for pre-Messinian submarine canyons on the Gulf of Lions slope (Western Mediterranean) ArchiMer
Lofi, J; Berne, Serge.
On the Gulf of Lions margin, the Messinian Salinity Crisis (MSC) event led to a significant and widespread erosion of the Miocene shelf and slope. It is thus difficult nowadays to restore the morphology of the margin at the beginning of the crisis, and to study the Middle-Upper Miocene series rarely preserved from erosion. In this study, thanks to the use of multichannel seismic reflection data from the Gulf of Lions western slope, it has been possible to image the Miocene slope deposits. Interpretation of the data reveals several diachronic sediment bodies just beneath the Miocene/Pliocene boundary. These bodies are related to slope erosional-depositional complexes, underlain by erosional unconformities outlined by seismic reflector truncations. They are...
Tipo: Text Palavras-chave: Messinian salinity crisis; Passive margin; Miocene/Pliocene; Submarine canyon.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4779.pdf
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Historical biogeography of Western Palaearctic pelobatid and pelodytid frogs: a molecular phylogenetic perspective Naturalis
Veith, M.; Fromhage, L.; Kosuch, J.; Vences, M..
Spadefoot toads (Pelobates) and Parsley frogs (Pelodytes) are an enigmatic group of Western Palaearctic anurans. In the genus Pelobates, a fossorial lifestyle has enforced a conserved bauplan that masks their intraspecific evolutionary history. We used partial sequences of the mitochondrial 16S and 12S rRNA genes to infer a paleobiogeographic scenario of speciation events in these two anuran genera. Based on two alternative, mutually exclusive calibrations of the Iberian-African split within Pelobates (Pb. cultripes and Pb. varaldii), the disjunction of the Betic Cordillera ca. 14-16 million years ago (mya), and the end of the Messinian Salinity crisis 5.33 mya, we inferred alternative scenarios for species evolution within both genera applying...
Tipo: Article / Letter to the editor Palavras-chave: Phylogeny; Paleobiogeography; Speciation; Regression-based molecular clock; Bayesian molecular dating; Messinian salinity crisis; 16S; 12S; 42.82.
Ano: 2006 URL: http://www.repository.naturalis.nl/record/214531
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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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Post-rift evolution of the Gulf of Lion margin tested by stratigraphic modelling ArchiMer
Leroux, Estelle; Rabineau, Marina; Aslanian, Daniel; Gorini, Christian; Bache, Francois; Moulin, Maryline; Pellen, Romain; Granjeon, Didier; Rubino, Jean-loup.
The sedimentary architecture of basins and passive margins is determined by a complex interaction of parameters, including subsidence, eustasy, and sediment supply. A quantification of the post-rift (20 Ma-0 Ma) vertical movements of the Gulf of Lion (West Mediterranean) is proposed here based on the stratigraphic study of sedimentary paleomarkers using a large 3D grid of reflection seismic data, correlations with existing drillings, and refraction data. Post-rift subsidence was measured by the direct use of sedimentary geometries analysed in 3D and validated by numerical stratigraphic modelling. Three domains of subsidence were found: on the continental shelf and slope, subsidence corresponds to a seaward tilting with different amplitudes, whereas the...
Tipo: Text Palavras-chave: Modélisations stratigraphiques; Stratigraphie sismique; Golfe du Lion; Post-Rift subsidence; Crise de salinité messinienne; Processus profonds et superficiels; Stratigraphic modelling; Seismic stratigraphy; Gulf of Lion; Post-rift subsidence; Messinian salinity crisis; Deep and surface processes.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00283/39421/37903.pdf
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Quantifying subsidence and isostatic readjustment using sedimentary paleomarkers, example from the Gulf of Lion ArchiMer
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
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Tectonic inheritance and Pliocene-Pleistocene inversion of the Algerian margin around Algiers: Insights from multibeam and seismic reflection data ArchiMer
Strzerzynski, Pierre; Deverchere, Jacques; Cattaneo, Antonio; Domzig, Anne; Yelles, Karim; De Lepinay, Bernard Mercier; Babonneau, Nathalie; Boudiaf, Azzedine.
The Algerian margin has originated from the opening of the Algerian basin about 25-30 Ma ago. The central margin provides evidence for large-scale normal faults of Oligo-Miocene age, whereas transcurrent tectonics characterizes the western margin. A set of NW-SE oriented dextral transform faults was active during basin opening and divided the 600 km long central margin into segments of similar to 120-150 km. The upper Miocene, Plio-Quaternary, and present-day tectonic setting is, however, compressional and supports the occurrence of a margin inversion, a process still poorly documented worldwide. We show that the central Algerian margin represents a rare example of inverted margin, where the process of subduction inception is particularly well expressed...
Tipo: Text Palavras-chave: Messinian salinity crisis; Western mediterranean sea; Northern algeria; Intraplate deformation; Incipient subduction; Plate kinematics; Salt tectonics; Boundary; Basin; Miocene.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00008/11883/9286.pdf
Registros recuperados: 6
Primeira ... 1 ... Última
 

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