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dc.contributor.authorUpton, B.G.J.
dc.contributor.authorUgra, R.
dc.contributor.authorYücel, C.
dc.contributor.authorTaylor, R.N.
dc.contributor.authorElliott, Holly
dc.creatorT.M., Gernon
dc.date.accessioned2019-08-23T13:00:41Z
dc.date.available2019-08-23T13:00:41Z
dc.date.issued2016-08-17
dc.identifier.citationGernon, T.M., Upton, B.G.J., Ugra, R., Yücel, C., Taylor, R.N. and Elliott, H., (2016). 'Complex subvolcanic magma plumbing system of an alkali basaltic maar-diatreme volcano (Elie Ness, Fife, Scotland)'. Lithos, 264, pp.70-85. DOI: 10.1016/j.lithos.2016.08.001en_US
dc.identifier.issn00244937
dc.identifier.doi10.1016/j.lithos.2016.08.001
dc.identifier.urihttp://hdl.handle.net/10545/624126
dc.description.abstractAlkali basaltic diatremes such as Elie Ness (Fife, Scotland) expose a range of volcanic lithofacies that points to a complex, multi-stage emplacement history. Here, basanites contain phenocrysts including pyrope garnet and sub-calcic augites from depths of ~60km. Volcanic rocks from all units, pyroclastic and hypabyssal, are characterised by rare earth element (REE) patterns that show continuous enrichment from heavy REE (HREE) to light REE (LREE), and high Zr/Y that are consistent with retention of garnet in the mantle source during melting of peridotite in a garnet lherzolite facies. Erupted garnets are euhedral and unresorbed, signifying rapid ascent through the lithosphere. The magmas also transported abundant pyroxenitic clasts, cognate with the basanite host, from shallower depths (~35–40km). These clasts exhibit wide variation in texture, mode and mineralogy, consistent with growth from a range of compositionally diverse melts. Further, clinopyroxene phenocrysts from both the hypabyssal and pyroclastic units exhibit a very wide compositional range, indicative of polybaric fractionation and magma mixing. This is attributed to stalling of earlier magmas in the lower crust — principally from ~22 to 28km — as indicated by pyroxene thermobarometry. Many clinopyroxenes display chemical zoning profiles, occasionally with mantles and rims of higher magnesium number (Mg#) suggesting the magmas were mobilised by juvenile basanite magma. The tuffs also contain alkali feldspar megacrysts together with Fe-clinopyroxene, zircon and related salic xenoliths, of the ‘anorthoclasite suite’ — inferred to have crystallised at upper mantle to lower crustal depths from salic magma in advance of the mafic host magmas. Despite evidence for entrainment of heterogeneous crystal mushes, the rapidly ascending melts experienced negligible crustal contamination. The complex association of phenocrysts, megacrysts and autoliths at Elie Ness indicates thorough mixing in a dynamic system immediately prior to explosive diatreme-forming eruptions.en_US
dc.description.sponsorshipClough and Mykura Fund of the Geological Society of Edinburgh; Timothy Jefferson Fund of the Geological Society of Londonen_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.ispartofLithos
dc.relation.urlhttps://www.sciencedirect.com/science/article/pii/S0024493716302171en_US
dc.relation.urlhttps://eprints.soton.ac.uk/id/eprint/399447
dc.rights© 2016 Elsevier B.V. All rights reserved.
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/us/*
dc.subjectAlkali basalten_US
dc.subjectDiatremeen_US
dc.subjectClinopyroxeneen_US
dc.subjectPyroxeniteen_US
dc.subjectMagmaen_US
dc.subjectEruptionen_US
dc.titleComplex subvolcanic magma plumbing system of an alkali basaltic maar-diatreme volcano (Elie Ness, Fife, Scotland)en_US
dc.typeArticleen_US
dc.identifier.eissn18726143
dc.contributor.departmentUniversity of Southamptonen_US
dc.identifier.journalLithosen_US
dc.relation.volume264
dc.source.volume264
dc.source.beginpage70
dc.source.endpage85
dcterms.dateAccepted2016-08-04
refterms.dateFOA2019-08-23T13:00:42Z
dc.author.detail786787en_US


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