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| Lebas, E.; Le Friant, A.; Boudon, G.; Watt, S. F. L.; Talling, P. J.; Feuillet, Nathalie; Deplus, Christine; Berndt, C.; Vardy, M. E.. |
| New high-resolution multichannel seismic data (GWADASEIS-2009 and JC45/46-2010 cruises; 72 and 60 channels, respectively) combined with previous data (AGUADOMAR-1999 and CARAVAL-2002; 6 and 24 channels, respectively) allow a detailed investigation of mass-wasting processes around the volcanic island of Montserrat in the Lesser Antilles. Seven submarine deposits have sources on the flanks of Montserrat, while three are related to the nearby Kahouanne submarine volcanoes. The most voluminous deposit (similar to 20 km(3)) within the Bouillante-Montserrat half-graben has not been described previously and is probably related to a flank instability of the Centre Hills Volcano on Montserrat, while other events are related to the younger South Soufriere... |
| Tipo: Text |
Palavras-chave: Debris avalanches; Flank collapse; Submarine slope failure; Montserrat; Lesser Antilles. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00200/31100/29510.pdf |
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| Beck, C.; Reyss, J-l; Leclerc, F.; Moreno, E.; Feuillet, Nathalie; Barrier, L.; Beauducel, F.; Boudon, G.; Clement, V.; Deplus, Christine; Gallou, N.; Lebrun, J-f; Le Friant, A.; Nercessian, A.; Paterne, M.; Pichot, Thibaud; Vidal, C.. |
| During the GWADASEIS cruise (Lesser Antilles volcanic arc, February-March 2009) a very high resolution (VHR) seismic-reflection survey was performed in order to constrain Late Quaternary to Present faulting. The profiles we obtained evidence frequent "ponding" of reworked sediments in the deepest areas, similar to the deposition of Mediterranean "homogenites". These bodies are acoustically transparent (few ms t.w.t. thick) and are often deposited on the hanging walls of dominantly normal faults, at the base of scarps. Their thickness appears sufficient to compensate (i.e. bury) co-seismic scarps between successive earthquakes, resulting in a flat and horizontal sea floor through time. In a selected area (offshore Montserrat and Nevis islands), piston... |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00089/20040/21990.pdf |
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| Wall-palmer, D.; Hart, M. B.; Smart, C. W.; Sparks, R. S. J.; Le Friant, A.; Boudon, G.; Deplus, Christine; Komorowski, J. C.. |
| The aragonite shell-bearing thecosome pteropods are an important component of the oceanic plankton. However, with increasing pCO(2) and the associated reduction in oceanic pH (ocean acidification), thecosome pteropods are thought to be particularly vulnerable to shell dissolution. The distribution and preservation of pteropods over the last 250 000 years have been investigated in marine sediment cores from the Caribbean Sea close to the island of Montserrat. Using the Limacina Dissolution Index (LDX), fluctuations in pteropod calcification through the most recent glacial/interglacial cycles are documented. By comparison to the oxygen isotope record (global ice volume), we show that pteropod calcification is closely linked to global changes in pCO(2) and pH... |
| Tipo: Text |
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| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00215/32656/31067.pdf |
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