Oceanic core complexes expose gabbroic rocks on the seafl oor via detachment faulting, often associated with serpentinized peridotite. The thickness of these serpentinite units is unknown.Assuming that the steep slopes that typically surround these core complexes provide a cross section through the structure, it has been inferred that serpentinites compose much of thesection to depths of at least several hundred meters. However, deep drilling at oceanic core complexes has recovered gabbroic sequences with virtually no serpentinized peridotite. Wepropose a revised model for oceanic core complex development based on consideration of the rheological differences between gabbro and serpentinized peridotite: emplacement of alarge intrusive gabbro body into a predominantly peridotite host is followed by localization of strain around the margins of the pluton, eventually resulting in an uplifted gabbroic coresurrounded by deformed serpentinite. Oceanic core complexes may therefore refl ect processes associated with relatively enhanced periods of mafic intrusion within overall magma-poorregions of slow- and ultra-slow-spreading ridges.
Oceanic core complexes and crustal accretion at slow-spreading ridges / Ildefonse, B.; Blackman, D.; John, B. E.; Ohara, Y.; Miller, D. J.; Macleod, C. J.; Abe, N.; Abratis, M.; Andal, E. S.; Andréani, M.; Awaji, S.; Beard, J. S.; Brunelli, Daniele; Charney, A. B.; Christie, D. M.; Delacour, A. G.; Delius, H.; Drouin, M.; Einaudi, F.; Escartin, J.; Frost, B. R.; FRYER P., B; Gee, J. S.; Godard, M.; Grimes, C. B.; Halfpenny, A.; Hansen, H. E.; Harris, A. C.; Hasebe, A. T.; Hayman, N. W.; Hellebrand, E.; Hirose, T.; Hirth, J. G.; Ishimaru, S.; Johnson, K. T. M.; Karner, G. D.; Linek, M.; 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.. - In: GEOLOGY. - ISSN 0091-7613. - STAMPA. - 35:(2007), pp. 623-626. [10.1130/G23531A.1]
Oceanic core complexes and crustal accretion at slow-spreading ridges.
BRUNELLI, Daniele;
2007
Abstract
Oceanic core complexes expose gabbroic rocks on the seafl oor via detachment faulting, often associated with serpentinized peridotite. The thickness of these serpentinite units is unknown.Assuming that the steep slopes that typically surround these core complexes provide a cross section through the structure, it has been inferred that serpentinites compose much of thesection to depths of at least several hundred meters. However, deep drilling at oceanic core complexes has recovered gabbroic sequences with virtually no serpentinized peridotite. Wepropose a revised model for oceanic core complex development based on consideration of the rheological differences between gabbro and serpentinized peridotite: emplacement of alarge intrusive gabbro body into a predominantly peridotite host is followed by localization of strain around the margins of the pluton, eventually resulting in an uplifted gabbroic coresurrounded by deformed serpentinite. Oceanic core complexes may therefore refl ect processes associated with relatively enhanced periods of mafic intrusion within overall magma-poorregions of slow- and ultra-slow-spreading ridges.
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