|
|
|
|
|
| Sultan, Nabil; Gaudin, Mathieu; Berne, Serge; Canals, Miquel; Urgeles, Roger; Lafuerza, Sara. |
| To improve understanding of evolution of submarine canyons, a three-dimensional slope-stability model is applied to Bourcart Canyon in the western Gulf of Lions in the Mediterranean Sea. The model builds on previous work by Chen and others, and it uses the upper bound theorem of plasticity to calculate the factor of safety of a kinematically admissible failing mass. Examples of three-dimensional failure surfaces documented in the literature were used to test the model formulation. Model application to Bourcart Canyon employed the results of a detailed stratigraphic analyses based on data acquired by swath bathymetry, sub-bottom profiling, high-resolution seismic reflection surveys, and piston coring. The sediment layers were also characterized using... |
| Tipo: Text |
Palavras-chave: Cascadia accretionary complex; Upper bound theorem; Stability analysis; Continental slope; Limit equilibrium; Western gulf; Offshore; Margin; Initiation; Sediment. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2410.pdf |
| |
|
|
| 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 |
| |
|
|
| Jouet, Gwenael; Gaudin, Mathieu; Bassetti, Maria-angela; Berne, Serge; Rabineau, Marina; Dennielou, Bernard; Sierro, F; Flores, J; Taviani, M. |
| The Rhône deltaic margin (NW Mediterranean) was under the influence of a very high sedimentation flux during the last climatic cycle, because of the vicinity of major fluvial systems that fed the outer shelf during the glacial period and the inner shelf during the deglacial period. The two areas provide a complete sedimentary record of depositional events from 130 cal. kyr BP to present. This sequence represents the sedimentary expression of the glacial/interglacial cycle (100 kyr cyclicity) within the Late Quaternary succession [1]. [Extract] |
| Tipo: Text |
|
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/acte-6152.pdf |
| |
|
|
| Gonthier, E; Cirac, P; Faugeres, J; Gaudin, Mathieu; Cremer, M; Bourillet, Jean-francois. |
| Acoustic and core data have recently been collected on the shelf break and the upper part of the slope of the south Aquitaine continental margin. They reveal the major role played by mass-flow gravity processes in deposit erosion and redistribution, modelling of the sea-bed, and transfer of sediment toward the deep-sea. The study region is bounded in the south by the Capbreton canyon. The northern area, which shows a smooth morphology, is characterised by small-scale deformations due to sediment creep or low-amplitude slide processes. The deformations are associated with mini listric-like faults that bound packets of sediments in which the deposit geometry is typical of constructional sediment waves. These sediment waves result from the interaction of... |
| Tipo: Text |
Palavras-chave: Sediment transfer; Mass flows; Sediment wave; Continental slope; Canyon; Bay of Biscay. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-3960.pdf |
| |
|
|
| Gaudin, Mathieu; Berne, Serge; Jouanneau, J.-m.; Palanques, A; Puig, P; Mulder, T; Cirac, P; Rabineau, Marina; Imbert, P. |
| Nowadays, the Gulf of Lions continental shelf and slope are under the influence of dense water cascading, wind-induced bottom currents and the geostrophic Northern Current. In order to characterize sedimentary activity at the shelf break, several interface and piston cores were taken in the Bourcart canyon head and a current meter equipped with temperature, conductivity, pressure and turbidity sensors was moored during the 2003-2004 winter season. Even if the canyon is not connected directly to continental sources since Last Glacial Maximum, detailed grain size, X-ray and sediment facies analysis of interface cores show that down to 350 m water depth, the canyon head is blanketed by up to 1.5 m of structureless muddy medium-grained sand. 210 Pb-exc... |
| Tipo: Text |
Palavras-chave: Pb 210exc activity; Sand deposits; Cascading; Submarine canyon. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-2324.pdf |
| |
|
| |
|
|
| Mulder, Thierry; Cirac, Pierre; Gaudin, Mathieu; Bourillet, Jean-francois; Trainer, J.; Normand, Alain; Weber, O.; Griboulard, R.; Jouanneau, Jean-marie; Anschutz, Pierre; Jorissen, Frans. |
| Submarine canyons are narrow but deep submarine valleys that extend for hundreds of meters. They represent the most impressive structures that shape the present morphology of passive continental margins. They can occur off the mouth of rivers: the Tagus, Zaire, Amazon, and Orinoco in the Atlantic; the Indus in the Indian Ocean; and the Var, Rhone, and Ebro in the Mediterranean. Some are at times disconnected from any stream mouth such as the Nazare canyon, off Portugal, despite the fact that it is close to the coast. Some were connected to a river mouth during lowstands of sea level, such as the Wilmington canyon in the northwest Atlantic, or the Blackmud canyon in the northeast Atlantic. |
| Tipo: Text |
|
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/00071/18201/15769.pdf |
| |
|
|
|
