Composition and origin of nodules from the ≈20 ka Pomici di Base (PB)-Sarno eruption of Mt. Somma – Vesuvius, Italy

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dc.contributor.authorKlébesz, Ritaen
dc.contributor.authorBodnar, Robert J.en
dc.contributor.authorDe Vivo, Benedettoen
dc.contributor.authorTörök, Kálmánen
dc.contributor.authorLima, Annamariaen
dc.contributor.authorPetrosino, Paolaen
dc.contributor.departmentGeosciencesen
dc.date.accessioned2019-08-23T19:20:31Zen
dc.date.available2019-08-23T19:20:31Zen
dc.date.issued2012-05-13en
dc.description.abstractNodules (coarse-grain “plutonic” rocks) were collected from the ca. 20 ka Pomici di Base (PB)-Sarno eruption of Mt. Somma-Vesuvius, Italy. The nodules are classified as monzonite-monzogabbro based on their modal composition. The nodules have porphyrogranular texture, and consist of An-rich plagioclase, K-feldspar, clinopyroxene (ferroan-diopside), mica (phlogopite-biotite) ± olivine and amphibole. Aggregates of irregular intergrowths of mostly alkali feldspar and plagioclase, along with mica, Fe-Ti-oxides and clinopyroxene, in the nodules are interpreted as crystallized melt pockets. Crystallized silicate melt inclusions (MI) are common in the nodules, especially in clinopyroxenes. Two types of MI have been identified. Type I consists of mica, Fe-Ti-oxides and/or dark green spinel, clinopyroxene, feldspar and a vapor bubble. Volatiles (CO2, H2O) could not be detected in the vapor bubbles by Raman spectroscopy. Type II inclusions are generally lighter in color and contain subhedral feldspar and/or glass and several opaque phases, most of which are confirmed to be oxide minerals by SEM analysis. Some of the opaque-appearing phases that are below the surface may be tiny vapor bubbles. The two types of MI have different chemical compositions. Type I MI are classified as phono-tephrite — tephri-phonolite — basaltic trachy-andesite, while Type II MI have basaltic composition. The petrography and MI geochemistry led us to conclude that the nodules represent samples of the crystal mush zone in the active plumbing system of Mt. Somma-Vesuvius that were entrained into the upwelling magma during the PB-Sarno eruption.en
dc.description.notesformer journal title: Central European Journal of Geosciencesen
dc.description.sponsorshipPhD Programme (XXV Cycle, Coordinated by B. De Vivo) “Internal dynamics of volcanic systems and hydrogeological-environmental risks” of the University of Naples Federico IIen
dc.description.sponsorshipVirginia Techen
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.2478/s13533-011-0059-6en
dc.identifier.issue2en
dc.identifier.urihttp://hdl.handle.net/10919/93251en
dc.identifier.volume4en
dc.language.isoenen
dc.publisherDe Gruyteren
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivs 3.0 United Statesen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/us/en
dc.subjectMt. Somma-Vesuviusen
dc.subjectnodulesen
dc.subjectmelt inclusionsen
dc.subjectcrystal mush zoneen
dc.titleComposition and origin of nodules from the ≈20 ka Pomici di Base (PB)-Sarno eruption of Mt. Somma – Vesuvius, Italyen
dc.title.serialOpen Geosciencesen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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