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Accueil > Documents > Pages personnelles > ILDEFONSE Benoît > Recherche > En mer

En mer ...

Drilling the SouthWest Indian Ridge : ODP Leg 176

ODP Hole 735B is located on top of an oceanic core complex, south of the ridge, east of the Atlantis II fracture zone. This hole reached the depth of 1508 meters below sea floor, with an expectional recovery of 87%. Hole 735B gabbroic rocks present many unique characters, such as a large variety of structures and micrustructures, from hypersolidus to low-temperature conditions, including abundant cryst-plastic deformation, numerous reverse ductile shear zones, ...

Gauche : localisation du Puits 735B
Milieu : exemples de zones de cisaillement ductile dans les gabbros
Droite : intensité de la déformation plastique en fonction de la profondeur


























References :
- Ildefonse, B., Hirth, G., John, B., Trimby, P., Yoshinobu, A., and ODP Leg 176 Scientific Party, 1998. Structural evolution of the lower crust at slow-spreading ridge : preliminary results from ODP Leg 176, site 735B, south-west indian ridge. Solicited paper. EGS98, Nice, Annales Geophysicae, supplement I to vol. 16, C293.
- Yoshinobu, A., Hirth, B., and Ildefonse, B., 1998. Foliation Development Across the Magmatic to Crystal-Plastic Transition in Oceanic Gabbros : Preliminary Results From ODP Leg 176, Hole 735B, Southwest Indian Ridge. AGU spring meeting 1998, Boston.
- Einaudi, F., Pezard, P. and Ildefonse, B., 2000. Petrophysical properties and structures in the footwall of a low-angle detachment plane in gabbroic basement (ODP sites 735 & 1105, SWIR), EGS 2000, Nice.
- Dick, H.J.B., Natland, J.H., Alt, J.C., Bach, W., Bideau, D., Gee, J.S., Haggas, S., Hertogen, J.G.H., Hirh, G., Holm, P.M., Ildefonse, B., Iturrino, G.J., John, B.E., Kelley, D.S., Kikawa, E., Kingdon, A., LeRoux, P.J., Maeda, J., Meyer, P.S., Miller, J.D., Naslund, H.R., Niu, Y., Robinson, P.T., Snow, J., Stephen, R.A., Trimby, P.W., Worm, H.U. and Yoshinobu, A., 1999. Proc. ODP, Init. Repts., 176.
- Ildefonse, B. and Bideau, D., 1999. Une section in situ de la croûte océanique profonde. Compte-rendu du Leg ODP 176 (Puits 735B, dorsale sud-ouest indienne). Géochronique, 69 : 9.
- Dick, H.J.B., Natland, J.H., Alt, J.C., Bach, W., Bideau, D., Gee, J.S., Haggas, S., Hertogen, J.G.H., Hirh, G., Holm, P.M., Ildefonse, B., Iturrino, G.J., John, B.E., Kelley, D.S., Kikawa, E., Kingdon, A., LeRoux, P.J., Maeda, J., Meyer, P.S., Miller, J.D., Naslund, H.R., Niu, Y., Robinson, P.T., Snow, J., Stephen, R.A., Trimby, P.W., Worm, H.U. and Yoshinobu, A., 2000. A long in-situ section of the lower ocean crust : results of ODP Leg 176 drilling at the Southwest Indian Ridge. Earth and Planetary Science Letters. 179 : 31-51.
- Robinson, P.T., Dick, H.J.B., Natland, J.H., Alt, J.C., Bach, W., Bideau, D., Gee, J.S., Haggas, S., Hertogen, J.G.H., Hirh, G., Holm, P.M., Ildefonse, B., Iturrino, G.J., John, B.E., Kelley, D.S., Kikawa, E., Kingdon, A., LeRoux, P.J., Maeda, J., Meyer, P.S., Miller, J.D., Naslund, H.R., Niu, Y., Snow, J., Stephen, R.A., Trimby, P.W., Worm, H.U. and Yoshinobu, A., 2000. Lower oceanic crust formed at an ultra-slow-spreading ridge : Ocean Drilling Program Hole 735B, Southwest Indian Ridge. In : Dilek, Y., Moores, E.M., Elthon, D., and Nicola, A. (Editors), Ophiolites and oceanic crust : new insights from field studies and the Ocean Drilling program. Geol. Soc. Am. Spec. Paper, 349 : 75-86.
- Ildefonse, B. and Pezard, P.A., 2001. Electrical properties of slow-spreading ridge gabbros from ODP site 735, Southwest Indian Ridge. Tectonophysics. 330 : 69-92.
- Ildefonse, B., Pezard, P.A., and Einaudi, F., 2002. Electrical properties of slow-spreading ridge gabbrosfrom ODP Site 735, Southwest Indian Ridge. Interridge SWIR (SouthWest Indian Ridge) workshop, April 2002, Southampton, UK.
- Iturrino, G.I., Ildefonse, B. and Boitnott, G., 2002. Velocity structure of the lower oceanic crust : Results from ODP hole 735B, Atlantis II Fracture Zone. In : Natland, J.H., Dick, H.J.B., Miller, D.J., and Von Herzen, R.P. (Editors), Proc. ODP, Sci. Results, 176.
- Ildefonse, B., Dick, H. and Cannat, M., 2002. Sampling the Lower Crust at the Slow-Spreading, Southwest Indian Ridge. In White, K. and Urquhart, E. (Eds.), ODP’s Greatest Hits, Volume 2, 1pp.
- Dick, H.J.B., Natland, J.H., and Ildefonse, 2006. Past and Future Impact of Deep Drilling in the Ocean Crust and Mantle : An Evolving Order Out of New Complexity. Oceanography, 19 (4) : 72-80.
- Ildefonse, B., Rona, P.A., and Blackman, D.K., 2007. Deep Sampling of the Crust formed at Mid-Ocean Ridges : Scientific Ocean Drilling provides perspective ’in-depth’. Oceanography, 20 (1) : 22-33.