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Drilling the Atlantis massif (MAR, 30°N) : Mid-Atlantic Ridge, 30°N : IODP Expeditions 304 and 305

During IODP Expeditions 304 and 305 (Nov 2004 - Feb 2005), we have drilled a 1415 meter deep hole in the Atlantis Massif, an oceanic core complex located at 30°, east of the Mid-Atlantic Ridge. The recovered section ( 75% recovery) is essentially gabbroic, with a variety of lithologies ranging from troctolites to diabase and basalts. It contains in particular a series of very olivine-rich troctolites, dunites and wehrlites, that are locally very fresh (<1-2% serpentinite) and constitute a unique record in ocean drilling history. This oceanic crustal section is the most primitive drilled so far, and is moderately altered at conditions ranging from granulite to zeolite facies. The low-angle detachment fault that caps the Atlantis massif is mostly associated to low-temperature, greenschist facies, ductile to brittle deformation. The central dome is clearly not an uplifted dominantly upper mantle section, as had been inferred prior to drilling from available geological and geophysical data, pointing to significant lateral lithological heterogeneity over short distances.

References :
- Blackman, D.K., Ildefonse, B., John, B.E., MacLeod, C.J., Ohara, Y., Miller, D.J., and the Expedition 304/305 Project Team, 2004. Oceanic core complex formation, Atlantis Massif—oceanic core complex formation, Atlantis Massif, Mid-Atlantic Ridge : drilling into the footwall and hanging wall of a tectonic exposure of deep, young oceanic lithosphere to study deformation, alteration, and melt generation. IODP Sci. Prosp., 304/305. doi:10.2204/iodp.sp.304305.2004.
- IODP 304/305 Shipboard Scientific Party, 2005. Drilling at Atlantis massif oceanic core complex. IODP expeditions 304 and 305. EGU Vienna. Geophysical Research Abstracts, Vol. 7, 05896, 2005.
- John, B.E., Blackman, D., Ildefonse, B., Ohara, Y., Miller, D.J., and IODP 304/305 Shipboard Science Party, 2005. Crustal Accretion and Denudation Processes at Slow Spreading MOR - Insight From IODP Hole U1309D (MAR 30°N). Eos Trans. AGU, 86(52), Fall Meet. Suppl., Abstract T33G-04 (Invited).
- Blackman, D., Ildefonse, B., John, B., Ohara, Y., Miller, D.J., MacLeod, C., and IODP 304/305 Shipboard Science Party, 2005. Geophysical Constraints on the Nature of Atlantis Massif, 30°N MAR. Eos Trans. AGU, 86(52), Fall Meet. Suppl., Abstract T33G-05 (invited).
- Expedition Scientific Party, 2005. Oceanic core complex formation, Atlantis Massif—oceanic core complex formation, Atlantis Massif, Mid-Atlantic Ridge : drilling into the footwall and hanging wall of a tectonic exposure of deep, young oceanic lithosphere to study deformation, alteration, and melt generation. IODP Prel. Rept., 304. doi:10:2204/iodp.pr.304.2005.
- Expedition Scientific Party, 2005. Oceanic core complex formation, Atlantis Massif—oceanic core complex formation, Atlantis Massif, Mid-Atlantic Ridge : drilling into the footwall and hanging wall of a tectonic exposure of deep, young oceanic lithosphere to study deformation, alteration, and melt generation. IODP Prel. Rept., 305. doi:10:2204/iodp.pr.305.2005.
- IODP Expeditions 304-305 Scientists, 2005. IODP Expeditions 304 and 305 : Oceanic Core Complex formation, Atlantis Massif. Scientific Drilling, 1 : 28-31.
- Ildefonse, B., Blackman, D., John, B.E., Ohara, Y., Miller, D.J., MacLeod, C.J., and IODP Expeditions 304-305 Scientific Party, 2005. A revised model of oceanic core complex structure ? Indications from IODP expeditions 304-305, Mid-Atlantic Ridge, 30°N, and previous ocean drilling results. Geophysical Research Abstracts, Vol. 8, 05723, SRef-ID : 1607-7962/gra/EGU06-A-05723.
- Blackman, D.K., Ildefonse, B., John, B.E., Ohara, Y., Miller, D.J., MacLeod, C.J., and the Expedition 304/305 Scientists, 2006. Proc. IODP, 304/305 : College Station TX (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.304305.2006
- 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.
- M. Drouin, M. Godard, and B. Ildefonse, 2006. Composition of olivine-rich gabbroic rocks at the Atlantis Massif (MAR 30°N, IODP site U1309). In situ trace element geochemistry. Eos Trans. AGU, 87(52), Fall Meet. Suppl., Abstract B31B-1097
- B. Ildefonse, D. Blackman, B.E. John, Y. Ohara, D.J. Miller, C. MacLeod and IODP Expeditions 304/305 Science Party, 2006. Oceanic Core Complexes and Crustal Accretion at Slow-Spreading Ridges. Indications From IODP Expeditions 304-305 and Previous Ocean Drilling Results. Eos Trans. AGU, 87(52), Fall Meet. Suppl., Abstract B31B-1096
- Ildefonse, B., Blackman, D.K., john, B.E., Ohara, Y., Miller, D.J., MacLeod, C.J., and the IODP Expeditions 304-305 Scientists, 2006. IODP Expeditions 304 & 305 Characterize the Lithology, Structure, and Alteration of an Oceanic Core Complex. Scientific Drilling, 3, 4-11, doi:10.2204/iodp.sd.3.01.2006.
- B. Ildefonse, D. Blackman, B.E. John, Y. Ohara, D.J. Miller, C. MacLeod and IODP Expeditions 304/305 Science Party, 2006. Oceanic Core Complexes and Crustal Accretion at Slow-Spreading Ridges. Indications From IODP Expeditions 304-305 and Previous Ocean Drilling Results. Eos Trans. AGU, 87(52), Fall Meet. Suppl., Abstract B31B-1096
- M.Drouin, M. Godard, and B. Ildefonse, 2006. Composition of olivine-rich gabbroic rocks at the Atlantis Massif (MAR 30°N, IODP site U1309). In situ trace element geochemistry. Eos Trans. AGU, 87(52), Fall Meet. Suppl., Abstract B31B-1097
- Ildefonse, B., Blackman, D.K., John, B.E., Ohara, Y., Miller, D.J., MacLeod, C.J., and the Expedition 304/305 Scientists, 2007. Oceanic Core Complexes and Crustal Accretion at Slow-Spreading Ridges. Geology, 35, 623-626 ; doi:10.1130/G23531A.1
- 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.
- M. Drouin, M. Godard, and B. Ildefonse, 2007. Origin of olivine-rich gabbroic rocks from the Atlantis Massif (MAR 30°N, IODP Hole U1309D) : petrostructural and geochemical study. Geophysical Research Abstracts, Vol. 9, 06550, 2007. SRef-ID : 1607-7962/gra/EGU2007-A-06550
- Ildefonse, B., 2008. Oceanic core complexes and crustal accretion at slow-spreading ridges. Indications from IODP expeditions 304-305 and previous ocean drilling results. Geophysical Research Abstracts, Vol. 10, EGU2008-A-03096, 2008. SRef-ID : 1607-7962/gra/EGU2008-A-03096
- Drouin M., Godard M., Ildefonse B., Bruguier O., Garrido C., 2009. In situ geochemistry of olivine-rich troctolites (IODP Hole U1309D, Atlantis Massif, Mid-Atlantic Ridge, 30°N) : a record of magmatic impregnation in the lower oceanic crust. Chem. Geol. 264, 71-88. doi:10.1016/j.chemgeo.2009.02.013
- Beard J.S., Frost B.R., Fryer P., McCaig A., Searle R., Ildefonse B., Zinin P., and Sharma S.K., 2009. Onset and progression of two-stage serpentinization and magnetite formation in olivine-rich troctolite from IODP Hole U1309D. J. Petrol. 50, 387-403. doi:10.1093/petrology/egp004
- Ildefonse B., Drouin M., Violay M., and Pezard P., 2009. Data report : Electrical properties of gabbroic and troctolitic rocks from IODP Hole U1309D, Atlantis Massif. In : Blackman, D.K., Ildefonse, B., John, B.E., Ohara, Y., Miller, D.J., MacLeod, C.J., and the Expedition 304/305 Scientists, 2006. Proc. IODP, 304/305 : College Station TX (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.304305.204.2009
- Miller D.J., Abratis M., Christie D., Drouin M., Godard M., Ildefonse B., Maeda J., Weinsteiger A., Yamasaki T., Suzuki Y., Niino A., Sato Y., and Takeda F., 2009. Data Report : Microprobe analyses of primary mineral phases (plagioclase, pyroxene, olivine, and spinel) from Site U1309, Atlantis Massif, Integrated Ocean Drilling Program Expedition 304/305. In : Blackman, D.K., Ildefonse, B., John, B.E., Ohara, Y., Miller, D.J., MacLeod, C.J., and the Expedition 304/305 Scientists, 2006. Proc. IODP, 304/305 : College Station TX (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.304305.202.2009
- Ildefonse, B., Drouin, M., Violay, M., and Pezard, P.A., 2009. Electrical properties of gabbroic and troctolitic rocks from IODP Hole U1309D, Mid-Atlantic Ridge, 30°N. EGU General Assembly 2009, Vienna (Austria), April 19-24, 2009. Geophysical Research Abstracts, Vol. 11, EGU2009-3737.
- Ildefonse B., Drouin M., and Godard M., 2009. Highly impregnated slow-spread lithosphere : microstructure and geochemistry of olivine-rich troctolites from IODP Hole U1309D. EGU General Assembly 2009, Vienna (Austria), April 19-24, 2009. Geophysical Research Abstracts, Vol. 11, EGU2009-4118. Invited Talk
- Ildefonse, B., Godard, M., and Drouin, M., 2009. The Atlantis Massif and IODP Hole U1309D : an illustration of the interconnection between oceanic core complexes and magmatic activity ? Alpine Ophiolites and Modern Analogues, Workshop, Parma (Italy), Sept 30 - Oct 2, 2009. Invited Talk
- Drouin, M., Ildefonse, B., Godard, M., 2010. A microstructural imprint of melt impregnation in slow spreading lithosphere : Olivine-rich troctolites from the Atlantis Massif, Mid-Atlantic Ridge, 30 degrees N, IODP Hole U1309D. Geochemistry Geophysics Geosystems 11, Q06003. doi:10.1029/2009GC002995
- Ildefonse, B., Godard, M., and Drouin, M., 2010. The Atlantis Massif : An Illustration of the Interplay Between Core Complex Development and Magmatic Activity. AGU Chapman Conference on Detachments in Oceanic Lithosphere : Deformation, Magmatism, Fluid Flow, and Ecosystems, Agros, Cyprus, 9-15 May 2010.
- Godard, M., and Ildefonse, B., 2010. Geochemistry of IODP Site U1309 Gabbroic Series (Atlantis Massif) : Evidence for High and Cyclic Magmatic Activity. AGU Chapman Conference on Detachments in Oceanic Lithosphere : Deformation, Magmatism, Fluid Flow, and Ecosystems, Agros, Cyprus, 9-15 May 2010.
- Drouin, M., Ildefonse, B., Hirth, G., Waters, C.L., Godard, M., 2010. Crystallographic preferred orientations and melt-rock interactions : olivine-rich troctolites from IODP Hole U1309D. Abstract T23A-2228 presented at 2010 Fall Meeting, AGU, San Francisco, Calif., 13-17 Dec.
- Blackman, D.K., Ildefonse, B., John, B.E., Ohara, Y., Miller, D.J., Abe, N., Abratis, M., Andal, E.S., Andréani, M., Awaji, S., Beard, J.S., Brunelli, D., Charney, A.B., Christie, D.M., Collins, J., Delacour, A.G., Delius, H., Drouin, M., Einaudi, F., Escartin, J., Halfpenny, A., Hansen, H.E., Harris, A.C., Tamura, A., Hayman, N.W., Hellebrand, E., Hirose, T., Hirh, J.G., Ishimaru, S., Johnson, K.T.M., Karner, G.D., Linek, M., Macleod, C.J., Maeda, J., Mason, O.U., McCaig, A.M., Michibayashi, K., Morris, A., Nakagawa, T., Nozaka, T., Rosner, M., Searle, R.C., Suhr, G., Tominaga, M., von der Handt, A., Yamasaki, T., Zhao, X., 2011. Drilling constraints on lithospheric accretion and evolution at Atlantis Massif, Mid-Atlantic Ridge 30° N. J. Geophys. Res. 116, B07103. doi:10.1029/2010JB007931