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dc.contributor.authorGardiner, N. J.
dc.contributor.authorKirkland, C. L.
dc.contributor.authorHollis, J.
dc.contributor.authorSzilas, K.
dc.contributor.authorSteenfelt, A.
dc.contributor.authorYakymchuk, C.
dc.contributor.authorHeide-Jørgensen, H.
dc.date.accessioned2019-09-17T12:30:03Z
dc.date.available2019-09-17T12:30:03Z
dc.date.issued2019-03
dc.identifier.citationGardiner , N J , Kirkland , C L , Hollis , J , Szilas , K , Steenfelt , A , Yakymchuk , C & Heide-Jørgensen , H 2019 , ' Building Mesoarchaean crust upon Eoarchaean roots : the Akia Terrane, West Greenland ' , Contributions to Mineralogy and Petrology , vol. 174 , 20 . https://doi.org/10.1007/s00410-019-1554-xen
dc.identifier.issn0010-7999
dc.identifier.otherPURE: 261214853
dc.identifier.otherPURE UUID: 594bd0ab-9e41-4d53-90dd-e67fdaf88010
dc.identifier.otherScopus: 85062077374
dc.identifier.otherORCID: /0000-0003-3465-9295/work/62311885
dc.identifier.urihttp://hdl.handle.net/10023/18486
dc.descriptionThe Maniitsoq project is supported by the Ministry of Mineral Resources and Labour, Government of Greenland. NJG thanks Curtin University and Australian Research Council grant FL160100168 for financial support.en
dc.description.abstractConstraining the source, genesis, and evolution of Archaean felsic crust is key to understanding the growth and stabilization of cratons. The Akia Terrane, part of the North Atlantic Craton, West Greenland, is comprised of Meso-to-Neoarchaean orthogneiss, with associated supracrustal rocks. We report zircon U–Pb and Lu–Hf isotope data, and whole-rock geochemistry, from samples of gneiss and supracrustals from the northern Akia Terrane, including from the Finnefjeld Orthogneiss Complex, which has recently been interpreted as an impact structure. Isotope data record two major episodes of continental crust production at ca. 3.2 and 3.0 Ga. Minor ca. 2.7 and 2.5 Ga magmatic events have more evolved εHf, interpreted as reworking of existing crust perhaps linked to terrane assembly. Felsic rocks from the Finnefjeld Orthogneiss Complex were derived from the same source at the same time as the surrounding tonalites, but from shallower melting, requiring any bolide-driven melting event to have occurred almost simultaneously alongside the production of the surrounding crust. A simpler alternative has the Finnefjeld Complex and surrounding tonalite representing the coeval genesis of evolved crust over a substantial lithospheric depth. Hafnium isotope data from the two major Mesoarchaean crust-forming episodes record a contribution from older mafic Eoarchaean crust. Invoking the involvement of an Eoarchaean root in the growth of younger Mesoarchaean crust puts important constraints on geodynamic models of the formation of the discrete terranes that ultimately assembled to form Earth’s cratons.
dc.language.isoeng
dc.relation.ispartofContributions to Mineralogy and Petrologyen
dc.rightsCopyright © The Author(s) 2019. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.en
dc.subjectArcheanen
dc.subjectHf isotope evolutionen
dc.subjectNorth Atlantic Cratonen
dc.subjectPartial melting anatexisen
dc.subjectTTGen
dc.subjectQE Geologyen
dc.subjectGE Environmental Sciencesen
dc.subjectGeophysicsen
dc.subjectGeochemistry and Petrologyen
dc.subjectDASen
dc.subject.lccQEen
dc.subject.lccGEen
dc.titleBuilding Mesoarchaean crust upon Eoarchaean roots : the Akia Terrane, West Greenlanden
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Earth & Environmental Sciencesen
dc.identifier.doihttps://doi.org/10.1007/s00410-019-1554-x
dc.description.statusPeer revieweden


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