Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/7238
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dc.contributor.authorallCorreale, A.; DiSTeM, UNIPAen
dc.contributor.authorallMartelli, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italiaen
dc.contributor.authorallPaonita, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italiaen
dc.contributor.authorallRizzo, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italiaen
dc.contributor.authorallBrusca, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italiaen
dc.contributor.authorallScribano, V.; UNICTen
dc.date.accessioned2011-12-20T13:07:36Zen
dc.date.available2011-12-20T13:07:36Zen
dc.date.issued2012-02en
dc.identifier.urihttp://hdl.handle.net/2122/7238en
dc.description.abstractWe analyzed major and trace elements, Sr and Nd isotopes in ultramafic xenoliths in Miocenic age Hyblean diatremes, along with noble gases of CO2-rich fluid inclusions hosted in the same products. The xenoliths consist of peridotites and pyroxenites, which are considered to be derived from the upper mantle. Although the mineral assemblage of peridotites and their whole-rock abundance of major elements (e.g., Al2O3 = 0.8–1.5 wt.%, TiO2 = 0.03–0.08 wt.%) suggest a residual character of the mantle, a moderate enrichment in some incompatible elements (e.g., LaN/YbN = 9–14) highlights the presence of cryptic metasomatic events. In this context a deep silicate liquid is considered the metasomatizing agent, which is consistent with the occurrence of pyroxenites as veins in peridotites. Both the Zr/Nb and 143Nd/144Nd ratios of the investigated samples reveal two distinct compositional groups: (1) peridotites with Zr/Nb ≈ 4 and 143Nd/144Nd ≈ 0.5129, and (2) pyroxenites with Zr/Nb ≈ 20 and 143Nd/144Nd ≈ 0.5130. The results of noble-gas analyses also highlight the difference between the peridotite and pyroxenite domains. Indeed, the 3He/4He and 4He/40Ar* ratios measured in the fluid inclusions of peridotites (respectively 7.0–7.4 ± 0.1 Ra and 0.5–8.2, where Ra is the atmospheric 3He/4He ratio of 1.38 × 10− 6) were on average lower than those for the pyroxenites (respectively 7.2–7.6 Ra and 0.62–15). This mantle heterogeneity is interpreted as resulting from a mixing between two end-members: (1) a peridotitic layer with 3He/4He ≈ 7 Ra and 4He/40Ar* ≈ 0.4, which is lower than the typical mantle ratio (~ 1–4) probably due to melt extraction events, and (2) metasomatizing mafic silicate melts that gave rise to pyroxenites characterized by 3He/4He ≈ 7.6 Ra, with a variable 4He/40Ar* due to degassing processes connected with the ascent of magma at different levels in the peridotite wall rock. The complete geochemical data set also suggests two distinct mantle sources for the xenolithic groups highlighted above: (1) a HIMU (high-μ)-type source for the peridotites and (2) a DM (depleted mantle)-type source for the pyroxenites.en
dc.language.isoEnglishen
dc.publisher.nameElsevieren
dc.relation.ispartofLithosen
dc.relation.ispartofseries/132-133 (2012)en
dc.subjectnoble gasesen
dc.subjectmantleen
dc.subjectxenolithsen
dc.subjectfluid inclusionsen
dc.titleNew evidence of mantle heterogeneity beneath the Hyblean Plateau (southeast Sicily, Italy) as inferred from noble gases and geochemistry of ultramafic xenolithsen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber70-81en
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistryen
dc.identifier.doi10.1016/j.lithos.2011.11.007en
dc.description.obiettivoSpecifico2.4. TTC - Laboratori di geochimica dei fluidien
dc.description.journalTypeJCR Journalen
dc.description.fulltextrestricteden
dc.contributor.authorCorreale, A.en
dc.contributor.authorMartelli, M.en
dc.contributor.authorPaonita, A.en
dc.contributor.authorRizzo, A.en
dc.contributor.authorBrusca, L.en
dc.contributor.authorScribano, V.en
dc.contributor.departmentDiSTeM, UNIPAen
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.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italiaen
dc.contributor.departmentUNICTen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextrestricted-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Milano, Milano, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italia-
crisitem.author.deptUNICT-
crisitem.author.orcid0000-0001-8525-1754-
crisitem.author.orcid0000-0001-9124-5027-
crisitem.author.orcid0000-0003-2225-3781-
crisitem.author.orcid0000-0002-6570-9673-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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