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dc.contributor.authorMartin, Adam P.en_NZ
dc.contributor.authorPrice, Richard C.en_NZ
dc.contributor.authorCooper, Alan F.en_NZ
dc.contributor.authorMcCammon, Catherine A.en_NZ
dc.date.accessioned2017-10-20T03:08:25Z
dc.date.available2015-01-01en_NZ
dc.date.available2017-10-20T03:08:25Z
dc.date.issued2015en_NZ
dc.identifier.citationMartin, A. P., Price, R. C., Cooper, A. F., & McCammon, C. A. (2015). Petrogenesis of the Rifted Southern Victoria Land Lithospheric Mantle, Antarctica, Inferred from Petrography, Geochemistry, Thermobarometry and Oxybarometry of Peridotite and Pyroxenite Xenoliths from the Mount Morning Eruptive Centre. Journal of Petrology, 56(1), 193–226. https://doi.org/10.1093/petrology/egu075en
dc.identifier.issn0022-3530en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/11423
dc.description.abstractThe lithospheric mantle beneath West Antarctica has been characterized using petrology, whole-rock and mineral major element geochemistry, whole-rock trace element chemistry and Mössbauer spectroscopy data obtained on a suite of peridotite (lherzolite and harzburgite) and pyroxenite xenoliths from the Mount Morning eruptive centre, Southern Victoria Land. The timing of pyroxenite formation in Victoria Land overlaps with subduction of the Palaeo-Pacific plate beneath the Gondwana margin and pyroxenite is likely to have formed when fluids derived from, or modified by, melting of the subducting, eclogitic, oceanic crustal plate percolated through peridotite of the lithospheric mantle. Subsequent melting of lithospheric pyroxenite veins similar to those represented in the Mount Morning xenolith suite has contributed to the enriched trace element (and isotope) signatures seen in Cenozoic volcanic rocks from Mount Morning, elsewhere in Victoria Land and Zealandia. In general, the harzburgite xenoliths reflect between 20 and 30% melt depletion. Their depleted element budgets are consistent with Archaean cratonization ages and they have mantle-normalized trace element patterns comparable with typical subcontinental lithospheric mantle. The spinel lherzolite mineral data suggest a similar amount of depletion to that recorded in the harzburgites (20–30%), whereas plagioclase lherzolite mineral data suggest <15% melt depletion. The lherzolite (spinel and plagioclase) xenolith whole-rocks have compositions indicating <20% melt depletion, consistent with Proterozoic to Phanerozoic cratonization ages, and have mantle-normalized trace element patterns comparable with typical depleted mid-ocean ridge mantle. All peridotite xenoliths have undergone a number of melt–rock reaction events. Melting took place mainly in the spinel peridotite stability field, but one plagioclase peridotite group containing high-sodium clinopyroxenes is best modelled by melting in the garnet field. Median oxygen fugacity estimates based on Mössbauer spectroscopy measurements of spinel and pyroxene for spinel-facies conditions in the rifted Antarctic lithosphere are –0·6 Δlog fO₂ at Mount Morning and –1·0 ± 0·1 (1σ) Δlog fO₂ for all of Victoria Land, relative to the fayalite–magnetite–quartz buffer. These values are in good agreement with a calculated global median value of –0·9 ± 0·1 (1σ) Δlog fO₂ for mantle spinel-facies rocks from continental rift systems.
dc.format.mimetypeapplication/pdf
dc.language.isoenen_NZ
dc.publisherOxford University Pressen_NZ
dc.rights© The Author 2015. Published by Oxford University Press.
dc.subjectScience & Technologyen_NZ
dc.subjectPhysical Sciencesen_NZ
dc.subjectGeochemistry & Geophysicsen_NZ
dc.subjectlithospheric mantleen_NZ
dc.subjectoxygen fugacityen_NZ
dc.subjectpyroxeniteen_NZ
dc.subjectspinel peridotiteen_NZ
dc.subjecteclogiteen_NZ
dc.subjectOROGENIC LHERZOLITE MASSIFSen_NZ
dc.subjectSPINEL OXYGEN GEOBAROMETERen_NZ
dc.subjectTRACE-ELEMENT COMPOSITIONSen_NZ
dc.subjectMARIE-BYRD-LANDen_NZ
dc.subjectNEW-ZEALANDen_NZ
dc.subjectFERRIC IRONen_NZ
dc.subjectCONTINENTAL-CRUSTen_NZ
dc.subjectINTRAPLATE VOLCANISMen_NZ
dc.subjectMELT/ROCK REACTIONen_NZ
dc.subjectRONDA PERIDOTITEen_NZ
dc.titlePetrogenesis of the Rifted Southern Victoria Land Lithospheric Mantle, Antarctica, Inferred from Petrography, Geochemistry, Thermobarometry and Oxybarometry of Peridotite and Pyroxenite Xenoliths from the Mount Morning Eruptive Centreen_NZ
dc.typeJournal Article
dc.identifier.doi10.1093/petrology/egu075en_NZ
dc.relation.isPartOfJournal of Petrologyen_NZ
pubs.begin-page193
pubs.elements-id128016
pubs.end-page226
pubs.issue1en_NZ
pubs.organisational-group/Waikato
pubs.organisational-group/Waikato/FSEN
pubs.organisational-group/Waikato/FSEN/Faculty of Science and Engineering Office
pubs.organisational-group/Waikato/Staff
pubs.publication-statusPublisheden_NZ
pubs.volume56en_NZ
dc.identifier.eissn1460-2415en_NZ


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