Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/4232
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dc.contributor.authorallMartelli, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italiaen
dc.contributor.authorallNuccio, P. M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italiaen
dc.contributor.authorallStuart, F.; Suercen
dc.contributor.authorallDi Liberto, V.; Dip CFTA, Univ. Palermoen
dc.contributor.authorallEllam, R.; Suercen
dc.date.accessioned2008-11-24T13:11:45Zen
dc.date.available2008-11-24T13:11:45Zen
dc.date.issued2008-02-02en
dc.identifier.urihttp://hdl.handle.net/2122/4232en
dc.description.abstractHelium isotope ratios of olivine and pyroxene phenocrysts from Plio-Quaternary volcanic rocks from southern Italy (seven Aeolian Islands, Mt. Vulture, Etna, Ustica, and Pantelleria) range from 2.3 to 7.1 Ra. Importantly, the phenocryst 3He/4He correlate well with whole rock Sr isotopic composition (0.70309– 0.70711), reflecting the mixing of two sources. A significant contribution of He from crustal contamination is recorded only occasionally (e.g., pyroxenes from Vulcano). When merged with data from the Roman Comagmatic Province, a remarkably strong near-linear He-Sr isotope correlation is apparent. The general northward decrease in 3He/4He corresponds to an increase in 87Sr/86Sr (and a decrease in 143Nd/144Nd and 206Pb/204Pb) that is due to increasing metasomatic enrichment of the mantle wedge via subduction of the Ionian-Adriatic plate. Calculations based on the ingrowth of 4He in the wedge and on the 4He content of the subducting crust show that mechanisms of enrichment in radiogenic He are effective only if the wedge is strongly depleted in He relative to best estimates of the depleted mantle. This can be accommodated if the process of metasomatism by the subduction fluids depletes the mantle wedge. The 3He/4He of Pantelleria, Etna, Iblei, Ustica, Alicudi, and Filicudi basalts (7.0 ± 0.6 Ra) define the mantle composition least affected by subduction-related metasomatism. Although these volcanoes are from a variety of tectonic regimes (subduction-related, intraplate, rifting), their similarities suggest a common origin of geochemical features. Their characteristics are consistent with a HIMU-type mantle that either is younger than the Cook- Austral island end-member or has a lower 238U/204Pb.en
dc.language.isoEnglishen
dc.publisher.nameAGUen
dc.relation.ispartofGeochemistry Geophysics Geosystemsen
dc.relation.ispartofseries2/9 (2008)en
dc.subjectheliumen
dc.subjectstrontiumen
dc.titleConstraints on mantle source and interactions from He-Sr isotope variation in Italian Plio-Quaternary volcanismen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumberQ02001en
dc.subject.INGV04. Solid Earth::04.08. Volcanology::04.08.01. Gasesen
dc.identifier.doi10.1029/2007GC001730en
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dc.description.obiettivoSpecifico1.5. TTC - Sorveglianza dell'attività eruttiva dei vulcanien
dc.description.journalTypeJCR Journalen
dc.description.fulltextreserveden
dc.contributor.authorMartelli, M.en
dc.contributor.authorNuccio, P. M.en
dc.contributor.authorStuart, F.en
dc.contributor.authorDi Liberto, V.en
dc.contributor.authorEllam, R.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italiaen
dc.contributor.departmentSuercen
dc.contributor.departmentDip CFTA, Univ. Palermoen
dc.contributor.departmentSuercen
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crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italia-
crisitem.author.deptUniversità di Palermo-
crisitem.author.deptIsotope Geosciences Unit, Scottish Universities Environmental Research Centre, East Kilbride G75 0QF, UK-
crisitem.author.deptDip CFTA, Univ. Palermo-
crisitem.author.deptSUERC, UK-
crisitem.author.orcid0000-0001-8525-1754-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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