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Durham University

Department of Earth Sciences

Profile

Publication details for Prof Roger Clive Searle

Ildefonse, B., Blackman, D. K., 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, D., 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., Tamura, A., 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. (2007). Oceanic core complexes and crustal accretion at slow-spreading ridges. Geology 35(7): 623-626.
  • Publication type: Journal Article
  • ISSN/ISBN: 0091-7613
  • DOI: 10.1130/G23531A.1
  • Keywords: Integrated Ocean Drilling Program, oceanic lithosphere

Author(s) from Durham

Abstract

Oceanic core complexes expose gabbroic rocks on the seafloor 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 the
section to depths of at least several hundred meters. However, deep drilling at oceanic core complexes has recovered gabbroic sequences with virtually no serpentinized peridotite. We propose a revised model for oceanic core complex development based on consideration of
the rheological differences between gabbro and serpentinized peridotite: emplacement of a large 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 core surrounded by deformed serpentinite. Oceanic core complexes may therefore reflect processes associated with relatively enhanced periods of mafic intrusion within overall magma-poor regions of slow- and ultra-slow-spreading ridges.