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dc.contributor.authorHunt, Emma J.
dc.contributor.authorFinch, Adrian A.
dc.contributor.authorDonaldson, Colin H.
dc.identifier.citationHunt , E J , Finch , A A & Donaldson , C H 2017 , ' Layering in peralkaline magmas, Ilímaussaq Complex, S Greenland ' , Lithos , vol. 268-271 , pp. 1-15 .
dc.identifier.otherPURE: 247263599
dc.identifier.otherPURE UUID: f59e3d75-2fe8-4928-b800-26bd924c28e3
dc.identifier.otherRIS: urn:EBF8D2270912682BDEFB38FA610C5E39
dc.identifier.otherScopus: 84996573009
dc.identifier.otherORCID: /0000-0002-3689-1517/work/38002300
dc.identifier.otherWOS: 000392680400001
dc.descriptionEJH acknowledges funding from a NERC PhD studentship and the work was completed at the University of St Andrews, UK.en
dc.description.abstractThe peralkaline to agpaitic Ilímaussaq Complex, S. Greenland, displays spectacular macrorhythmic (> 5 m) layering via the kakortokite (agpaitic nepheline syenite), which outcrops as the lowest exposed rocks in the complex. This study applies crystal size distribution (CSD) analyses and eudialyte-group mineral chemical compositions to study the marker horizon, Unit 0, and the contact to the underlying Unit − 1. Unit 0 is the best-developed unit in the kakortokites and as such is ideal for gaining insight into processes of crystal formation and growth within the layered kakortokite. The findings are consistent with a model whereby the bulk of the black and red layers developed through in situ crystallisation at the crystal mush–magma interface, whereas the white layer developed through a range of processes operating throughout the magma chamber, including density segregation (gravitational settling and flotation). Primary textures were modified through late-stage textural coarsening via grain overgrowth. An open-system model is proposed, where varying concentrations of halogens, in combination with undercooling, controlled crystal nucleation and growth to form Unit 0. Our observations suggest that the model is applicable more widely to the layering throughout the kakortokite series and potentially other layered peralkaline/agpaitic rocks around the world.
dc.rights© 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (
dc.subjectIlímaussaq Complexen
dc.subjectMacrorhythmic layeringen
dc.subjectCrystal size distributionen
dc.subjectEudialyte-group mineralsen
dc.subjectGE Environmental Sciencesen
dc.titleLayering in peralkaline magmas, Ilímaussaq Complex, S Greenlanden
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.Earth and Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews.School of Earth & Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews.Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews.St Andrews Isotope Geochemistryen
dc.contributor.institutionUniversity of St Andrews.Marine Alliance for Science & Technology Scotlanden
dc.description.statusPeer revieweden

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