Ridge segmentation and the magnetic structure of the Southwest Indian Ridge (at 50°30'E, 55°30'E and 66°20'E): Implications for magmatic processes at ultraslow-spreading centers.

Daniel Sauter (1) , Hélène Carton (1) , Véronique Mendel (1) , Marc Munschy (1) , Céline Rommevaux-Jestin (2) , Jean-Jacques Schott (1) , Hubert Whitechurch (1)

1 IPGS - Institut de physique du globe de Strasbourg
2 LGM - Laboratoire de Géosciences Marines

which is observed along the traces of the largest amagmatic discontinuities. By contrast, in thicker crust areas, the upper mantle rocks are shielded from the alteration and the serpentinization process may be delayed resulting, as on the Mid-Atlantic Ridge, in slightly more positive magnetization values along the traces of axial discontinuities, regardless of polarity.

Domaines: Géophysique [physics.geo-ph]; Géophysique [physics.geo-ph]

Daniel Sauter, Hélène Carton, Véronique Mendel, Marc Munschy, Céline Rommevaux-Jestin, et al.. Ridge segmentation and the magnetic structure of the Southwest Indian Ridge (at 50°30'E, 55°30'E and 66°20'E): Implications for magmatic processes at ultraslow-spreading centers.. Geochemistry, Geophysics, Geosystems, 2004, 5, pp.1-25. ⟨10.1029/2003GC000581⟩. ⟨hal-00104257⟩