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Accueil > Documents > Pages personnelles > ILDEFONSE Benoît > Recherche > L’ophiolite d’Oman

The oman ophiolite

The Oman paleo-spreading ridge

The Oman ophiolite is considered as an analogue to modern fast-spreading ridges. It reveals fundamental features about the mantle dynamics beneath the ridge, the geometry and dynamics of the ridge magma chamber, and the paleo ridge segmentation.

Structural maps, the result of more than 20 years of field studies conducted by the research group led by Adolphe Nicolas, were published in 2000 in a special issue of Marine Geophysical Research.

Left : Structural sketch of the Oman ophiolite (Nicolas et al., 2000)

References :
- Ildefonse, B., A. Nicolas, and F. Boudier, 1993. Evidence from the Oman ophiolite for sudden stress changes during melt injection at oceanic spreading centres, Nature, 366, 673-675.
- Ildefonse, B., and A. Nicolas, 1994. Comment concevoir les chambres magmatiques des dorsales océaniques à partir de l’étude des ophiolites, Géochronique, 49, 20-21.
- Nicolas, A., F. Boudier, and B. Ildefonse, 1994. Dike patterns in diapirs beneath oceanic ridges : the Oman ophiolite, in "Magmatic systems," (M.P. Ryan, ed), pp. 77-95, Academic Press, Orlando.
- Nicolas, A., F. Boudier, and B. Ildefonse, 1994. Evidence from the Oman ophiolite for active mantle upwelling beneath a fast-spreading ridge, Nature, 370, 51-53.
- Ildefonse, B., S. Billiau, and A. Nicolas, 1995. A detailed study of mantle flow away from diapirs in the Oman ophiolite, in "mantle and lower crust exposed in oceanic ridges and in ophiolites" (R.L.M. Vissers et A. Nicolas, eds), Kluwer, 163-177.
- Boudier, F., B. Ildefonse, and A. Nicolas, 1996. Magma chambers in the Oman ophiolite : fed from the top or from the bottom ?, Earth and Planetary Science Letter, 144 : 239-250.
- Nicolas, A., F. Boudier, and B. Ildefonse, 1996. Variable Moho depth in the Oman ophiolite. Implication for oceanic crust, Journal of Geophysical Research, 101 : 17941-17950.
- Nicolas, A. and Ildefonse, B., 1996. Flow mechanism and viscosity in basaltic magma chambers. Geophys. Res. Lett., 23 : 2013-2016.
- Boudier, F., Nicolas, A., Ildefonse, B. and Jousselin, D., 1997. EPR microplates, a model for the Oman ophiolite. Terra Nova, 9, 79-82.
- 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.
- Delouis, B., Nicolas, A., Ildefonse, B., and Philip, H., 1998. Earthquake focal mechanism and oceanic thrust in Easter microplate. Analogy with the Oman ophiolite. Geoph. Res. Lett., 25 : 1443-1446.
- Ildefonse, B., F. Boudier, and A. Nicolas, 1998. Asthenospheric and lithospheric deformation in Oman ophiolitic peridotite, in "Atlas of mylonitic and fault-related rocks," (A.W. Snoke, J.A. Tullis, and V.R. Todd eds). Princeton University Press, 588-591.
- Lamoureux, G., Ildefonse, B. and Mainprice, D., 1999. Modelling the seismic properties of fast-spreading ridge crustal LVZ : insights from Oman gabbro textures. Tectonophysics. 312 : 283-301.
- Nicolas, A., Boudier, F., Ildefonse, B. and Ball, E., 2000. Accretion of Oman and United Arab Emirates ophiolite. Discussion of a new structural map. Mar. Geoph. Res. 21 : 147-179.
- Nicolas, A., Ildefonse, B., Boudier, F. and Ben Ismail, W., 2000. Dike distribution in the Oman-United Arab Emirates ophiolite. Mar. Geoph. Res. 21 : 269-287.