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| Lallemand, S; Collot, J-y; Pelletier, B; Rangin, C; Cadet, J-p. |
| This paper presents some of the implications of oceanic asperities in subduction zones, based on examples gathered during the world circumnavigation of R/V Jean Charcot . The study of these examples provides a new overview of active margin modelling in response to asperity subduction. It is concluded that both erosion and accretion may be governed by the oceanic plate even though frontal tectonic erosion is better documented because it is accessible to conventional surveys. Most of the time, erosion is due to the relaxation of the arc slope in the wake of asperity/subduction. |
| Tipo: Text |
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| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00268/37957/36038.pdf |
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| Boucard, M; Marcaillou, B; Lebrun, Jf; Laurencin, M; Klingelhoefer, Frauke; Laigle, M; Lallemand, S; Schenini, L; Graindorge, David; Cornee, Jj; Munch, P; Philippon, M; The Antithesis 1, 3 And Garanti Scientific Teams.,. |
| Oblique collision of buoyant provinces against subduction zones frequently results in individualizing and rotating regional-scale blocks. In contrast, the collision of the Bahamas Bank against the Northeastern Caribbean Plate increased the margin convexity triggering forearc fragmentation into small-scale blocks. This deformation results in a prominent >450- km-long sequence of V-shaped basins that widens trenchward separated by elevated spurs, in the Northern Lesser Antilles (NLA, i.e. Guadeloupe to Virgin Island). In absence of deep structure imaging, various competing models were proposed to account for this faults-bounded Basins-and-Spurs System. High-resolution bathymetric and deep multichannel seismic data acquired during cruises... |
| Tipo: Text |
Palavras-chave: Margin tectonic fracturing; Northern Lesser Antilles; Oblique collision; Subduction erosion; Subduction zone; Vertical motion. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00651/76351/77343.pdf |
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