Oceanic core complexes and crustal accretion at slow-speading ridges

Benoit Ildefonse, D. K. Blackman, B. E. John, Y. Ohara, D. J. Miller, C. J. MacLeod, N. Abe, M. Abratis, E. S. Andal, M. Andréani, S. Awaji, J. S. Beard, D. Brunelli, A. B. Charney, D. M. Christie, A. G. Delacour, H. Delius, M. Drouin, F. Einaudi, J. Escartin & 31 others B. R. Frost, P. B. Fryer, J. S. Gee, M. Godard, C. B. Grimes, A. Halfpenny, H. E. Hansen, A. C. Harris, N. W. Hayman, E. Hellebrand, T. Hirose, J. G. Hirth, S. Ishimaru, K. T M Johnson, G. D. Karner, M. Linek, J. Maeda, O. U. Mason, A. M. McCaig, K. Michibayashi, A. Morris, T. Nakagawa, Toshio Nozaka, M. Rosner, R. C. Searle, G. Suhr, A. Tamura, M. Tominaga, A. von der Handt, T. Yamasaki, X. Zhao

Research output: Contribution to journalArticle

220 Citations (Scopus)

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 peridobte: 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-dow-spreading ridges.

Original languageEnglish
Pages (from-to)623-626
Number of pages4
JournalGeology
Volume35
Issue number7
DOIs
Publication statusPublished - Jul 2007
Externally publishedYes

Fingerprint

peridotite
serpentinite
accretion
gabbro
deep drilling
pluton
faulting
emplacement
seafloor
cross section
magma
rock

Keywords

  • Gabbro
  • Integrated Ocean Dilling Program
  • Mid-Atlantic Ridge
  • Mid-ocean ridges
  • Ocean Drilling Program
  • Oceanic core complex
  • Oceanic lithosphere
  • Serpentinite

ASJC Scopus subject areas

  • Geology

Cite this

Ildefonse, B., Blackman, D. K., John, B. E., Ohara, Y., Miller, D. J., MacLeod, C. J., ... Zhao, X. (2007). Oceanic core complexes and crustal accretion at slow-speading ridges. Geology, 35(7), 623-626. https://doi.org/10.1130/G23531A.1

Oceanic core complexes and crustal accretion at slow-speading ridges. / Ildefonse, Benoit; 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.; 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, Toshio; Rosner, M.; Searle, R. C.; Suhr, G.; Tamura, A.; Tominaga, M.; von der Handt, A.; Yamasaki, T.; Zhao, X.

In: Geology, Vol. 35, No. 7, 07.2007, p. 623-626.

Research output: Contribution to journalArticle

Ildefonse, B, Blackman, DK, John, BE, Ohara, Y, Miller, DJ, MacLeod, CJ, Abe, N, Abratis, M, Andal, ES, Andréani, M, Awaji, S, Beard, JS, Brunelli, D, Charney, AB, Christie, DM, Delacour, AG, Delius, H, Drouin, M, Einaudi, F, Escartin, J, Frost, BR, Fryer, PB, Gee, JS, Godard, M, Grimes, CB, Halfpenny, A, Hansen, HE, Harris, AC, Hayman, NW, Hellebrand, E, Hirose, T, Hirth, JG, Ishimaru, S, Johnson, KTM, Karner, GD, Linek, M, Maeda, J, Mason, OU, McCaig, AM, Michibayashi, K, Morris, A, Nakagawa, T, Nozaka, T, Rosner, M, Searle, RC, Suhr, G, Tamura, A, Tominaga, M, von der Handt, A, Yamasaki, T & Zhao, X 2007, 'Oceanic core complexes and crustal accretion at slow-speading ridges', Geology, vol. 35, no. 7, pp. 623-626. https://doi.org/10.1130/G23531A.1
Ildefonse B, Blackman DK, John BE, Ohara Y, Miller DJ, MacLeod CJ et al. Oceanic core complexes and crustal accretion at slow-speading ridges. Geology. 2007 Jul;35(7):623-626. https://doi.org/10.1130/G23531A.1
Ildefonse, Benoit ; 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. ; 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, Toshio ; Rosner, M. ; Searle, R. C. ; Suhr, G. ; Tamura, A. ; Tominaga, M. ; von der Handt, A. ; Yamasaki, T. ; Zhao, X. / Oceanic core complexes and crustal accretion at slow-speading ridges. In: Geology. 2007 ; Vol. 35, No. 7. pp. 623-626.
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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 peridobte: 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-dow-spreading ridges.",
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AU - Blackman, D. K.

AU - John, B. E.

AU - Ohara, Y.

AU - Miller, D. J.

AU - MacLeod, C. J.

AU - Abe, N.

AU - Abratis, M.

AU - Andal, E. S.

AU - Andréani, M.

AU - Awaji, S.

AU - Beard, J. S.

AU - Brunelli, D.

AU - Charney, A. B.

AU - Christie, D. M.

AU - Delacour, A. G.

AU - Delius, H.

AU - Drouin, M.

AU - Einaudi, F.

AU - Escartin, J.

AU - Frost, B. R.

AU - Fryer, P. B.

AU - Gee, J. S.

AU - Godard, M.

AU - Grimes, C. B.

AU - Halfpenny, A.

AU - Hansen, H. E.

AU - Harris, A. C.

AU - Hayman, N. W.

AU - Hellebrand, E.

AU - Hirose, T.

AU - Hirth, J. G.

AU - Ishimaru, S.

AU - Johnson, K. T M

AU - Karner, G. D.

AU - Linek, M.

AU - Maeda, J.

AU - Mason, O. U.

AU - McCaig, A. M.

AU - Michibayashi, K.

AU - Morris, A.

AU - Nakagawa, T.

AU - Nozaka, Toshio

AU - Rosner, M.

AU - Searle, R. C.

AU - Suhr, G.

AU - Tamura, A.

AU - Tominaga, M.

AU - von der Handt, A.

AU - Yamasaki, T.

AU - Zhao, X.

PY - 2007/7

Y1 - 2007/7

N2 - 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 peridobte: 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-dow-spreading ridges.

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KW - Integrated Ocean Dilling Program

KW - Mid-Atlantic Ridge

KW - Mid-ocean ridges

KW - Ocean Drilling Program

KW - Oceanic core complex

KW - Oceanic lithosphere

KW - Serpentinite

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