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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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| Deville, Eric; Mascle, A.; Callec, Y.; Huyghe, P.; Lallemant, S.; Lerat, O.; Mathieu, X.; De Carillo, C. Padron; Patriat, Martin; Pichot, Thibaud; Loubrieux, B.; Granjeon, D.. |
| Several marine geophysical data and piston-coring surveys acquired during the last decade allow one to better understand the close dynamic interactions between the sand-rich Orinoco turbidite system and the compressional structures of the Barbados prism. These interactions have been active since Eocene time as illustrated by the study of outcrops onshore Barbados Island. Because of strong morphologic and tectonic control in the east-Caribbean active margin, the present-day Orinoco turbiditic pattern system does not exhibit a classic fan geometry. The sea-floor geometry between the slope of the front of the Barbados prism and the slope of the South-American margin induces the convergence of the turbidite channels toward the abyssal plain, at the front of... |
| Tipo: Text |
Palavras-chave: Turbidite system; Active margin; Orinoco; Barbados. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00252/36373/34913.pdf |
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| Pichot, Thibaud; Nalpas, T.. |
| Compressive systems in foreland domains are characterised by fold and thrust belts linked to the presence of one or several ductile layers in depth acting as a decollement level. The main parameters controlling the structural evolution are: the presence of a decollement level, the amount and rate of shortening, and the amount of synkinematic sedimentation. The effect of these parameters has only been studied on a thrust belt scale. Furthermore, only the effect of synkinematic sedimentation on a simple system with one decollement level has been studied at the scale of a single structure. The aim of this study was to use analogue modelling to test the effect of shortening rate, velocity and the localization of sedimentation on a single system characterised... |
| Tipo: Text |
Palavras-chave: Analogue modelling; Synkinematic sedimentation; Decollement level; Thrust. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6781.pdf |
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| Huang, Haibo; Qiu, Xuelin; Pichot, Thibaud; Klingelhoefer, Frauke; Zhao, Minghui; Wang, Ping; Hao, Tianyao. |
| Evolution of the continental margins of the South China Sea (SCS) is one of the open questions when discussing continental breakup and seafloor spreading. We processed data from a wide-angle seismic profile (OBS2011–1), which passes through the northwestern margin of the SCS, and performed travel time modeling to obtain the seismic velocity structures. The modeling results show a stepwise variation of the crustal thicknesses from continental margin to oceanic basin. Stretching factor of the upper crust is nearly double the estimate of the lower crust along the Zhongsha Trough. The lower crust shows asymmetrical upwelling towards the trough center, accompanied by ∼0.3 km/s of the velocity increase due to magmatic addition. The upper and lower crusts have... |
| Tipo: Text |
Palavras-chave: Seismic tomography; Continental tectonics: extensional; Crustal structure; Rheology: crust and lithosphere. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00500/61189/64720.pdf |
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