Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/7713
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dc.contributor.authorallLigi, M.; Istituto di Scienze Marine - CNRen
dc.contributor.authorallBonatti, E.; Lamont Doherty Earth Observatory - Columbia University, New York (USA)en
dc.contributor.authorallBrunelli, D.; Dipartimento Scienze della Terra, Università di Modenaen
dc.contributor.authorallCipriani, A.; Dipartimento Scienze della Terra, Università di Modenaen
dc.contributor.authorallOttolini, L.; Istituto di Geoscienze e Georisorse - CNRen
dc.contributor.editorallBrugnoli, Enrico; DTA-CNRen
dc.contributor.editorallCavarretta, Giuseppe; DTA-CNRen
dc.contributor.editorallMazzola, Salvatore; IAMC-CNRen
dc.contributor.editorallTrincardi, Fabio; ISMAR-CNRen
dc.contributor.editorallRavaioli, Mariangela; ISMAR-CNRen
dc.contributor.editorallSantoleri, Rosalia; CNRen
dc.date.accessioned2012-02-14T23:12:16Zen
dc.date.available2012-02-14T23:12:16Zen
dc.date.issued2011-11en
dc.identifier.isbnISSN 2239-5172en
dc.identifier.urihttp://hdl.handle.net/2122/7713en
dc.description.abstractThe presence in the Earth’s mantle of even small amounts of water and other volatiles has major effects: first, it lowers drastically mantle’s viscosity, thereby facilitating convection and plate tectonics; second, it lowers the melting temperature of the rising mantle affecting the formation of the oceanic crust. H2O concentration in oceanic basalts stays below 0.2 wt% except for basalts sampled near “hot spots” that contain significantly more H2O than normal MORB, implying that their mantle plume sources are unusually H2O-rich. Basalts sampled in the Equatorial Atlantic close to the Romanche transform, a thermal minimum in the Ridge system, have a H2O content that increases as the ridge is cooled approaching the transform offset. These basalts are Na-rich, being generated by low degrees of melting of the mantle, and contain unusually high ratios of light versus heavy rare earth elements implying the presence of garnet in the melting region. H2O enrichment is due not to an unusually H2O-rich mantle source, but to a low extent of melting of the upwelling mantle, confined to a deep wet melting region. Numerical models predict that this wet melting process takes place mostly in the mantle zone of stability of garnet. This prediction is verified by the geochemistry of our basalts showing that garnet must indeed have been present in their mantle source. Thus, oceanic basalts are H2O-rich not only near “hot spots”, but also at “cold spots”.en
dc.language.isoEnglishen
dc.relation.ispartofMarine Research at CNRen
dc.subjectWater in the Mantleen
dc.subjectMelting Modelen
dc.subjectMantle Flowen
dc.subjectMid Atlantic Ridgeen
dc.titleWater in Mid Ocean Ridge Basalts: Some Like it Hot, Some Like it Colden
dc.typebook chapteren
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber671-690en
dc.identifier.URLhttp://www.dta.cnr.it/en
dc.subject.INGV04. Solid Earth::04.01. Earth Interior::04.01.02. Geological and geophysical evidences of deep processesen
dc.description.obiettivoSpecifico3.3. Geodinamica e struttura dell'interno della Terraen
dc.publisherConsiglio Nazionale delle Ricercheen
dc.description.fulltextopenen
dc.contributor.authorLigi, M.en
dc.contributor.authorBonatti, E.en
dc.contributor.authorBrunelli, D.en
dc.contributor.authorCipriani, A.en
dc.contributor.authorOttolini, L.en
dc.contributor.departmentIstituto di Scienze Marine - CNRen
dc.contributor.departmentLamont Doherty Earth Observatory - Columbia University, New York (USA)en
dc.contributor.departmentDipartimento Scienze della Terra, Università di Modenaen
dc.contributor.departmentDipartimento Scienze della Terra, Università di Modenaen
dc.contributor.departmentIstituto di Geoscienze e Georisorse - CNRen
dc.contributor.editorBrugnoli, Enricoen
dc.contributor.editorCavarretta, Giuseppeen
dc.contributor.editorMazzola, Salvatoreen
dc.contributor.editorTrincardi, Fabioen
dc.contributor.editorRavaioli, Mariangelaen
dc.contributor.editorSantoleri, Rosaliaen
dc.contributor.editordepartmentDTA-CNRen
dc.contributor.editordepartmentDTA-CNRen
dc.contributor.editordepartmentIAMC-CNRen
dc.contributor.editordepartmentISMAR-CNRen
dc.contributor.editordepartmentISMAR-CNRen
dc.contributor.editordepartmentCNRen
item.openairetypebook chapter-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextopen-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto di Scienze Marine, Consiglio Nazionale delle Ricerche, Bologna e Lamont Doherty Earth Observatory, Columbia University-
crisitem.author.deptLamont Doherty Earth Observatory, Columbia University-
crisitem.author.deptConsiglio Nazionale delle Ricerche—Istituto di Geoscienze e Georisorse (IGG), Sezione di Pavia, 27100 Pavia, Italy-
crisitem.author.orcid0000-0002-5098-5907-
crisitem.author.orcid0000-0003-4839-1939-
crisitem.classification.parent04. Solid Earth-
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