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dc.contributor.authorYakymchuk, Chris
dc.contributor.authorKirkland, Christopher L.
dc.contributor.authorCavosie, Aaron J.
dc.contributor.authorSzilas, Kristoffer
dc.contributor.authorHollis, Julie
dc.contributor.authorGardiner, Nicholas J.
dc.contributor.authorWaterton, Pedro
dc.contributor.authorSteenfelt, Agnete
dc.contributor.authorMartin, Laure
dc.date.accessioned2021-03-19T16:30:07Z
dc.date.available2021-03-19T16:30:07Z
dc.date.issued2021-03-01
dc.identifier.citationYakymchuk , C , Kirkland , C L , Cavosie , A J , Szilas , K , Hollis , J , Gardiner , N J , Waterton , P , Steenfelt , A & Martin , L 2021 , ' Stirred not shaken; critical evaluation of a proposed Archean meteorite impact in West Greenland ' , Earth and Planetary Science Letters , vol. 557 , 116730 . https://doi.org/10.1016/j.epsl.2020.116730en
dc.identifier.issn0012-821X
dc.identifier.otherPURE: 272416468
dc.identifier.otherPURE UUID: 0d5f1598-ea07-4d83-ba1e-cc63260fd119
dc.identifier.otherScopus: 85099170752
dc.identifier.otherORCID: /0000-0003-3465-9295/work/87404811
dc.identifier.otherWOS: 000612135500008
dc.identifier.urihttp://hdl.handle.net/10023/21670
dc.descriptionFunding Information: The Ministry of Mineral Resources and Labour, Greenland Government supported field and analytical work.en
dc.description.abstractLarge meteorite impacts have a profound effect on the Earth's geosphere, atmosphere, hydrosphere and biosphere. It is widely accepted that the early Earth was subject to intense bombardment from 4.5 to 3.8 Ga, yet evidence for subsequent bolide impacts during the Archean Eon (4.0 to 2.5 Ga) is sparse. However, understanding the timing and magnitude of these early events is important, as they may have triggered significant change points to global geochemical cycles. The Maniitsoq region of southern West Greenland has been proposed to record a ∼3.0 Ga meteorite impact, which, if confirmed, would be the oldest and only known impact structure to have survived from the Archean. Such an ancient structure would provide the first insight into the style, setting, and possible environmental effects of impact bombardment continuing into the late Archean. Here, using field mapping, geochronology, isotope geochemistry, and electron backscatter diffraction mapping of 5,587 zircon grains from the Maniitsoq region (rock and fluvial sediment samples), we test the hypothesis that the Maniitsoq structure represents Earth's earliest known impact structure. Our comprehensive survey shows that previously proposed impact-related geological features, ranging from microscopic structures at the mineral scale to macroscopic structures at the terrane scale, as well as the age and geochemistry of the rocks in the Maniitsoq region, can be explained through endogenic (non-impact) processes. Despite the higher impact flux, intact craters from the Archean Eon remain elusive on Earth.
dc.format.extent9
dc.language.isoeng
dc.relation.ispartofEarth and Planetary Science Lettersen
dc.rightsCopyright © 2020 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).en
dc.subjectBolideen
dc.subjectImpacten
dc.subjectManiitsoqen
dc.subjectNorth Atlantic Cratonen
dc.subjectPlanar deformation featuresen
dc.subjectZirconen
dc.subjectGE Environmental Sciencesen
dc.subjectGeophysicsen
dc.subjectGeochemistry and Petrologyen
dc.subjectEarth and Planetary Sciences (miscellaneous)en
dc.subjectSpace and Planetary Scienceen
dc.subjectDASen
dc.subject.lccGEen
dc.titleStirred not shaken; critical evaluation of a proposed Archean meteorite impact in 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/10.1016/j.epsl.2020.116730
dc.description.statusPeer revieweden
dc.identifier.urlhttps://www.sciencedirect.com/science/article/pii/S0012821X20306749?via%3Dihub#se0200en


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