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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/616
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dc.contributor.authorallD'Antonio, M.; Università Federico II, Dipartimento di scienze della terra e Instituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuvianoen
dc.contributor.authorallKristensen, M. B.; University of Aarhus, Department of Earth Sciencesen
dc.date.accessioned2006-01-17T20:19:39Zen
dc.date.available2006-01-17T20:19:39Zen
dc.date.issued2004-12en
dc.identifier.urihttp://hdl.handle.net/2122/616en
dc.description.abstractSerpentine minerals and brucite in ultramafic rocks from the South Chamorro Seamount were characterized chemically to investigate the serpentinization of the Mariana forearc mantle. Relict primary minerals of the serpentinites are olivine, enstatite and minor Cr-spinel and diopside. The secondary minerals are mostly serpentine and brucite with minor magnetite. The serpentine minerals, mostly lizardite and chrysotile, display large compositional variations. Al2O3 and Cr2O3 contents depend generally upon the nature of the primary mineral from which the serpentine was derived. Both serpentine minerals and brucite exhibit wide Mg, Fe and Mn substitution: the Mg# ranges are 95.1 77.2 and 88.9 60.8, respectively. These mineralogical and chemical features allowed us to estimate an upper temperature limit for serpentinization of ~200 300ºC, in agreement with recent thermal models which suggest that the serpentinized mantle wedge of the Izu-Bonin-Mariana subduction zone is cold. The high degree of serpentinization (40 100%, average >75%), and the serpentine + brucite paragenesis of these ultramafics imply that the Mariana forearc mantle has a significantly reduced density and strength down to ~30 km, which provides a driving mechanism for serpentinite diapirism. Pervasive serpentinization of the forearc by fluids released from the de´collement zone also explains the low seismicity of the Izu-Bonin-Mariana subduction zone.en
dc.format.extent441 bytesen
dc.format.extent5661496 bytesen
dc.format.mimetypetext/htmlen
dc.format.mimetypeapplication/pdfen
dc.language.isoEnglishen
dc.publisher.nameMineralogical Societyen
dc.relation.ispartofMineralogical Magazineen
dc.relation.ispartofseries68(6)en
dc.subjectserpentinizationen
dc.subjectmineral chemistryen
dc.subjectserpentine mud volcanoen
dc.subjectOcean Drilling Programen
dc.subjectforearc mantleen
dc.titleSerpentine and brucite of ultramafic clasts from the South Chamorro Seamount (Ocean Drilling Program Leg 195, Site 1200): inferences for the serpentinization of the Mariana forearc mantleen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber887–904en
dc.identifier.URLhttp://www.minersoc.orgen
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.05. Mineralogy and petrologyen
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.07. Rock geochemistryen
dc.identifier.doi10.1180/0026461046860229en
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Zanetti, A., Spadea, P., D’Antonio, M. and Vannucci, R. (2004) Trace element in clinopyroxene of peridotites from Mariana forearc seamounts (ODP Holes 1200A, 779A, and 784A): evidence for polybaric, high-degree, fractional mantle melting. Earth and Planetary Science Letters, submitted.en
dc.description.fulltextpartially_openen
dc.contributor.authorD'Antonio, M.en
dc.contributor.authorKristensen, M. B.en
dc.contributor.departmentUniversità Federico II, Dipartimento di scienze della terra e Instituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuvianoen
dc.contributor.departmentUniversity of Aarhus, Department of Earth Sciencesen
item.openairetypearticle-
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item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
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crisitem.author.deptUniversità di Napoli "Federico II"-
crisitem.author.dept3Department of Earth Sciences, University of Aarhus, CF Møllers Allé Building 110, DK-8000 Århus, Denmark.-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
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