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De Min, L.; Lebrun, J. F.; Cornee, J. J.; Munch, P.; Leticee, J. L.; Quillevere, F.; Melinte-dobrinescu, M.; Randrianasolo, A.; Marcaillou, B; Zami, F.. |
The Karukéra spur is an easternmost submerged rise of the Lesser Antilles fore-arc in the Guadeloupe archipelago, culminating about 4000 m above the fore-arc basin 150 km west of the deformation front. The analysis of 3500 km 2D high-resolution multichannel seismic reflection and multibeam bathymetric data, and the study of 14 core samples, allow for the first time to reconstruct its sedimentary anatomy and tectonic evolution. Seven seismic units (Us1 to Us7) are evidenced, organized into four major depositional sequences separated by erosional surfaces. Units Us1 to Us4 thicken to the south-southeast on the spur. The sedimentary deposits rest upon a deeply eroded metamorphic basement of the Caribbean Plate as in La Désirade Island. Sequence 1 (units Us1... |
Tipo: Text |
Palavras-chave: Lesser Antilles; Fore-arc; Karukéra spur; Neogene; Extensional tectonics; Basal erosion. |
Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00252/36372/34912.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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