georefid:2007-075936SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1130/G23531A.12007-01-01publicationgeorefid:2007-075936doi:10.1130/G23531A.1Ildefonse, BenoitUniversite de Montpellier II, Geosciences Montpellier, Montpellier, FranceauthorBlackman, D. K.Scripps Institution of Oceanography, United StatesauthorJohn, B. E.University of Wyoming, United StatesauthorOhara, Y.Ocean Research Laboratory, JapanauthorMiller, D. J.Integrated Ocean Drilling Program, United StatesauthorMacLeod, C. J.Cardiff University, United KingdomauthorAbe, N.authorAbratis, M.authorAndal, E. S.authorAndreani, M.authorAwaji, S.authorBeard, J. S.authorBrunelli, D.authorCharney, A. B.authorChristie, D. M.authorDelacour, A. G.authorDelius, H.authorDrouin, M.authorEinaudi, F.authorEscartin, J.authorFrost, B. R.authorFryer, P. B.authorGee, J. S.authorGodard, M.authorGrimes, C. B.authorHalfpenny, A.authorHansen, H. E.authorHarris, A. C.authorHayman, N. W.authorHellebrand, E.authorHirose, T.authorHirth, J. G.authorIshimaru, S.authorJohnson, K. T. M.authorKarner, G. D.authorLinek, M.authorMaeda, J.authorMason, O. U.authorMcCaig, A. M.authorMichibayashi, K.authorMorris, A.authorNakagawa, T.authorNozaka, T.authorRosner, M.authorSearle, R. C.authorSuhr, G.authorTamura, A.authorTominaga, M.authorvon der Handt, A.authorYamasaki, T.authorZhao, X.authorGeological Society of America (GSA), Boulder, CO, United StatespublisherdocumentHardcopyGeology (Boulder)35 (7)623-626Oceanic 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.completedSolid-earth geophysicsIgneous and metamorphic petrologyaccretionAtlantic OceanAtlantis Massifcorescrustdetachment faultsemplacementExpedition 305faultsgabbrosigneous rocksIntegrated Ocean Drilling ProgramintrusionsIODP Site 1309lithospheremetaigneous rocksmetamorphic rocksmetasomatic rocksmetasomatismMid-Atlantic Ridgemid-ocean ridgesOcean Drilling Programocean floorsoceanic core complexesoceanic crustoceanic lithosphereODP Site 735peridotitesplate tectonicsplutonic rocksplutonssea-floor spreadingserpentiniteserpentinizationspreading centersstrainultramaficsurn:org.iodp:exp:305urnlargerWorkCitationcampaignurn:org.iodp:exp:304:site:U1309urnlargerWorkCitationstudyurn:org.iodp:exp:304urnlargerWorkCitationcampaignurn:org.iodp:exp:305:site:U1309urnlargerWorkCitationstudyurn:org.iodp:exp:305urnlargerWorkCitationcampaignEnglishgeoscientificInformation-42.070057.1618-32.432730.1100With GSA Data Repository Item 2007165