Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/3734
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dc.contributor.authorallPerinelli, C.; università di pisaen
dc.contributor.authorallOrlando, A.; CNR IGG Firenzeen
dc.contributor.authorallConte, A. M.; CNR IGG Romaen
dc.contributor.authorallArmienti, P.; università di pisaen
dc.contributor.authorallBorrini, D.; Università Firenzeen
dc.contributor.authorallFaccini, B.; Università Firenzeen
dc.contributor.authorallMisiti, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
dc.date.accessioned2008-04-07T13:22:38Zen
dc.date.available2008-04-07T13:22:38Zen
dc.date.issued2008en
dc.identifier.urihttp://hdl.handle.net/2122/3734en
dc.description.abstractMagma generation in the Ross Sea system is related to partial melting of strongly metasomatised mantle sources where amphibole most probably plays a crucial role. In this context, metasomatism induced by a mela-nephelinite melt in lithospheric mantle of the Mt. Melbourne Volcanic Province (northern Victoria Land – NVL, Antarctica) was investigated experimentally studying the effects of melt interaction with lherzolite at 1.5-2.0 GPa and T=975-1300°C, and wehrlite at 1.0 GPa and T=1050-1250°C. The experiments were designed to induce melt infiltration into the ultramafic rocks. The observed modifications in minerals are compared with those found in mantle xenoliths from NVL. The effects of metasomatic modifications are evaluated on the basis of run temperature, distance from the infiltrating melt and on the diffusion rates of chemical components. Both in lherzolite and wehrlite, clinopyroxene exhibits large compositional variations ranging from primary diopside to high Mg-Cr-(Na) augitic and omphacitic clinopyroxenes in lherzolite, and to low Mg and high Ti-Al-Fe-Na augites in wehrlite. Olivine (in wehrlite) and spinel (in lherzolite) also result compositionally modified, the former shows enrichments in Fe, the latter displays a higher Cr/(Cr+Al) ratio. The systematic variations in mineral compositions imply modifications of the chemistry of the infiltrating melt as recorded by the glass veinlets and patches observed in some charges. In experiments involving wehrlite paragenesis, the glass composition approaches that of melt patches associated to both amphibole-free and amphibole-bearing natural samples, and is related to olivine+clinopyroxene crystallisation coupled with primary clinopyroxene dissolution at the contact between the metasomatising melt and the solid matrix. Even if amphibole crystallisation was not attained in the experiments, we were able to explain the occurrence of amphibole in the natural system considering that in this case a hot metasomatising melt infiltrates a cooler matrix.en
dc.language.isoEnglishen
dc.publisher.nameGeological Society, Londonen
dc.relation.ispartofGeological Society of London Special Publicationen
dc.relation.ispartofseries/293 (2008)en
dc.subjectMantleen
dc.subjectmetasomatismen
dc.subjectlherzoliteen
dc.subjectwehrliteen
dc.subjectmelt-rock reaction experimentsen
dc.titleMetasomatism induced by alkaline magma in the upper mantle of northern Victoria Land (Antarctica): an experimental approachen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber279-302en
dc.identifier.URLhttp://sp.lyellcollection.org/cgi/content/abstract/293/1/279en
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.05. Mineralogy and petrologyen
dc.identifier.doi10.1144/SP293.13en
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dc.description.obiettivoSpecifico2.3. TTC - Laboratori di chimica e fisica delle rocceen
dc.description.journalTypeN/A or not JCRen
dc.description.fulltextopenen
dc.contributor.authorPerinelli, C.en
dc.contributor.authorOrlando, A.en
dc.contributor.authorConte, A. M.en
dc.contributor.authorArmienti, P.en
dc.contributor.authorBorrini, D.en
dc.contributor.authorFaccini, B.en
dc.contributor.authorMisiti, V.en
dc.contributor.departmentuniversità di pisaen
dc.contributor.departmentCNR IGG Firenzeen
dc.contributor.departmentCNR IGG Romaen
dc.contributor.departmentuniversità di pisaen
dc.contributor.departmentUniversità Firenzeen
dc.contributor.departmentUniversità Firenzeen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italiaen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextopen-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptDipartimento di Scienze della Terra, Università di Pisa, Italy-
crisitem.author.deptINFN Laboratori Nazionali del Sud, Catania, Italy-
crisitem.author.deptC.N.R.-I.G.G.-U.O.S. of Rome, c/o Department of Earth Sciences-
crisitem.author.deptDipartimento di Scienze della Terra, Università di Pisa, Italy-
crisitem.author.deptUniversità Firenze-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia-
crisitem.author.orcid0000-0002-3546-7159-
crisitem.author.orcid0000-0002-6151-7789-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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