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| Pelletier, B; Dupont, J. |
| The Louisville Ridge, a hotspot chain, obliquely subducts at the Tonga-Kermadec consuming plate boundary (Southwest Pacific). This ridge has swept the Tonga Trench and the ridge-trench junction point is rapidly (at least 10 cm per year) migrating southward along the Kermadec trench. Results from a comparative morphological study between the Kermadec and Tonga margins, and from the Seapso 5 seabeam survey around the ridge-trench junction consider the effects of the subduction of an oblique ridge on an active margin. Underplating of material scraped and pushed in the front of the ridge could be responsible for the high-standing position of the Tonga platform in the prolongation of the Kermadec active volcanic line. |
| Tipo: Text |
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| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00268/37904/35985.pdf |
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| Foucher, J P; Bouysse, P; Davagnier, M; Dupont, J; Eissen, J P; Fouquet, Y; Gueneley, S; Harmegnies, F; Lapouille, A. |
| The Lau Basin lies between the Lau and Tonga ridges and extends over more than 1000 km. Its width decreases from 300 km near 16 degree S to less than 100 km near 24S. It is an actively spreading oceanic back-arc basin created in the Plio-Pleistocene the Tonga Trench. The part of the Valu Fa ridge North of 22 degree S was investigated during the Seapso 4 cruise of R/V Jean Charcot in Jan 1986 and complementary data were obtained during the Papnoum transit (Apr 1987). The techniques used included multibeam bathymetry, single-channel seismic reflection, magnetic and gravity field measurements. |
| Tipo: Text |
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| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00268/37933/36014.pdf |
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