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Mantle source heterogeneity, magma generation and magmatic evolution at Terceira Island (Azores archipelago): Constraints from elemental and isotopic (Sr, Nd, Hf, and Pb) data

2011-10Journal article Open access
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dc.contributor.authorMadureira, Pedro
dc.contributor.authorMata, João
dc.contributor.authorMattielli, Nadine
dc.contributor.authorQueiroz, Gabriela
dc.contributor.authorSilva, Pedro
dc.date.accessioned2013-02-15T16:18:19Z
dc.date.available2013-02-15T16:18:19Z
dc.date.issued2011-10
dc.description.abstractThis work addresses the present-day (<100 ka) mantle heterogeneity in the Azores region through the study of two active volcanic systems from Terceira Island. Our study shows that mantle heterogeneities are detectable even when "coeval" volcanic systems (Santa Barbara and Fissural) erupted less than 10 km away. These volcanic systems, respectively, reflect the influence of the Terceira and D. Joao de Castro Bank end-members defined by Beier et at (2008) for the Terceira Rift Santa Barbara magmas are interpreted to be the result of mixing between a HIMU-type component, carried to the upper mantle by the Azores plume, and the regional depleted MORB magmas/source. Fissural lavas are characterized by higher Ba/Nb and Nb/U ratios and less radiogenic Pb-206/Pb-204, Nd-143/Nd-144 and Hf-176/Hf-177, requiring the small contribution of delaminated sub-continental lithospheric mantle residing in the upper mantle. Published noble gas data on lavas from both volcanic systems also indicate the presence of a relatively undegassed component, which is interpreted as inherited from a lower mantle reservoir sampled by the ascending Azores plume. As inferred from trace and major elements, melting began in the garnet stability field, while magma extraction occurred within the spinel zone. The intra-volcanic system's chemical heterogeneity is mainly explained by variable proportions of the above-mentioned local end-members and by crystal fractionation processes.por
dc.identifier.citationMADUREIRA, Pedro; [et al] – Mantle source heterogeneity, magma generation and magmatic evolution at Terceira Island (Azores archipelago): Constraints from elemental and isotopic (Sr, Nd, Hf, and Pb) data. Lithos. ISSN 0024-4937. Vol. 126, n.º 3-4 (2011) pp.402-418.por
dc.identifier.doi10.1016/j.lithos.2011.07.002
dc.identifier.issn0024-4937
dc.identifier.urihttp://hdl.handle.net/10400.21/2211
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevierpor
dc.subjectOcean island basaltspor
dc.subjectSmall-scale mantle heterogeneitypor
dc.subjectTerceira Islandpor
dc.subjectAzorespor
dc.titleMantle source heterogeneity, magma generation and magmatic evolution at Terceira Island (Azores archipelago): Constraints from elemental and isotopic (Sr, Nd, Hf, and Pb) datapor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceAmsterdampor
oaire.citation.endPage418por
oaire.citation.issue3-4por
oaire.citation.startPage402por
oaire.citation.titleLithospor
oaire.citation.volume126por
person.familyNameMata
person.familyNameMattielli
person.familyNameSilva
person.givenNameJoão
person.givenNameNadine
person.givenNamePedro
person.identifier1232178
person.identifier.ciencia-id4312-8A60-15E3
person.identifier.ciencia-idC314-1157-FD0C
person.identifier.orcid0000-0001-5769-7708
person.identifier.orcid0000-0002-7170-1520
person.identifier.orcid0000-0002-9178-3623
person.identifier.ridI-3352-2012
person.identifier.ridB-8512-2008
person.identifier.scopus-author-id7102806167
person.identifier.scopus-author-id55431034700
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication7be0beb3-e47d-4ff0-befa-01dd05c93942
relation.isAuthorOfPublicationc370049a-3a1a-45c2-842a-82df39aea180
relation.isAuthorOfPublication54c96e27-8c3a-42d9-b751-ebc637c2f478
relation.isAuthorOfPublication.latestForDiscovery7be0beb3-e47d-4ff0-befa-01dd05c93942

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