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Oceanic core complexes and crustal accretion at slow-spreading ridges

Ildefonse, B, Blackman, D. K., John, B. E., Ohara, Y., Miller, D. J. and MacLeod, Christopher John 2007. Oceanic core complexes and crustal accretion at slow-spreading ridges. Geology -Boulder- 35 (7) , pp. 623-626. 10.1130/G23531A.1

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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.

Item Type: Article
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Uncontrolled Keywords: InProgram ; Ocean Drilling Program ; oceanic lithosphere ; mid-ocean ridges ; Mid-Atlantic Ridge • oceanic core complex • gabbro • serpentinite tegrated Ocean Drilling
Publisher: Geological Society of America
ISSN: 0091-7613
Last Modified: 04 Jun 2017 02:51
URI: http://orca.cf.ac.uk/id/eprint/12745

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