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| Recy, J; Pelletier, B; Charvis, P; Gerard, M; Monjaret, M-c; Maillet, P. |
| The New Hebrides back-arc troughs are restricted to the southern and northern rear of the arc. Lack of trough in the central part is related to the compression induced by the collision of the d'Entrecasteaux ridge and the New Hebrides arc. The southern troughs are 50-60 km wide and are composed of one or two grabens striking N130-140 degree , while the northern troughs extend over 70 km wide and are composed of a succession of N-S trending grabens, horsts and half-grabens. Although the location and the main trend (N150 degree ) of the troughs indicate that they are largely guided by the subduction, the direction of extension (N40-45 degree ) is clearly oblique to the volcanic line and thus does not seem related to the subduction process. Formation of the... |
| Tipo: Text |
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| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00268/37950/36031.pdf |
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| Auzende, Jean-marie; Eissen, Jean-philippe; Caprais, Marie-paule; Gente, Pascal; Gueneley, S; Harmegnies, Francois; Lagabrielle, Yves; Lapouille, A; Lefevre, C; Maillet, P; Maze, Jean-pierre; Ondreas, Helene; Schaaf, A; Singh, R. |
| Seismic, Seabeam, magnetic and gravimetrie surveys in the southern part of the N-Fiji basin were conducted during the SEAPSO LEG III Cruise. The active spreading axis was recognized between 17°30'S and 21°S. It consists of a continuous N-S Ridge cross-cut by transverse directions oriented N25 and N45. North of 17°30'S, the spreading System is more complex due to the existence of a possible triple junction located around 15° S. The eastern part of the N-Fiji basin, west of Viti Levu is mostly characterized by alternating highs and deeps (<4,000 m). This area must be regarded no more as a spreading center, but as complex boundary suffering transverse tectonics. |
| Tipo: Text |
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| Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/00184/29492/27835.pdf |
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| Monzier, M; Daniel, I; Maillet, P. |
| The collision between the 22 degree S salient of the Loyalty Ridge and the southern New Hebrides Arc began some 300,000 years ago. Nevertheless, the ridge probably influences, since 1 to 2 Ma, the subduction at the southern arcuate New Hebrides Trench through its action on the bulge of the downgoing plate. The morphology of the ridge, its deep root and relative buoyancy affect the flexure and the subduction of the downgoing plate in several ways. The proposed effects of this arc-ridge collision may be traced on a regional scale: in front of the collision zone, the southern New Hebrides active volcanic line is weakly developed, the intra-arc troughs are absent, and the Benioff zone is short. On the nearby north Fiji basin, the offset of the southern active... |
| Tipo: Text |
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| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00268/37946/36027.pdf |
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