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Accueil > Documents > Pages personnelles > Benoît ILDEFONSE > Recherche > Structures et Propriétés physiques des magmas

Structures et propriétés physiques des magmas

Flow mechanism in partially molten gabbro

Schematic elementary flow cycle

Although they show no or little crystal-plastic deformation, the Oman ophiolite gabbros are affected by numerous deformation structures, including foliations, lineations, folds and shear bands. We have proposed that, in the magma chambers, gabbros essentially deform by pressure solution, assisted by melt. The amount of required melt to allow deformation can then be much lower than the 30-35% critical melt fraction, and be compatible with ridge axis seismic data at the East Pacific Rise.

References
- Ildefonse, B. and Nicolas, A., 1996. Flow Mechanism and Viscosity in Fast-Spreading Ridge LVZ : Insights from the Oman Ophiolite Gabbros. AGU Fall meeting 1996, San-Francisco.
- Nicolas, A. and Ildefonse, B., 1996. Flow mechanism and viscosity in basaltic magma chambers. Geophys. Res. Lett., 23 : 2013-2016.
- Ildefonse, B. and Nicolas, B., 1997. Ecoulement magmatique dans les gabbros et problème des chambres magmatiques sous les dorsales océaniques. In "Des grands écoulements naturels à la dynamique du tas de sable : introduction aux suspensions concentrées en géologie et en physique" (B. Ildefonse, C. Allain & P. Coussot, eds.), Cemagref Editions, 37-49.