Ildefonse, Benoit; Blackman, D. K.; John, B. E.; Ohara, Y.; Miller, D. J.; MacLeod, C. J.; Abe, N.; Abratis, M.; Andal, E. S.; Andreani, 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.; 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.; Tamura, A.; Tominaga, M.; von der Handt, A.; Yamasaki, T.; Zhao, X. (2007): Oceanic core complexes and crustal accretion at slow-spreading ridges. Geological Society of America (GSA), Boulder, CO, United States, Geology (Boulder), 35 (7), 623-626, georefid:2007-075936

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.
Coverage:
West: -42.0700 East: 57.1618 North: 30.1100 South: -32.4327
Relations:
Expedition: 304
Site: 304-U1309
Expedition: 305
Site: 305-U1309
Supplemental Information:
With GSA Data Repository Item 2007165
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.1130/G23531A.1 (c.f. for more detailed metadata)
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