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No Change in the Recent Lunar Impact Flux Required Based on Modeling of Impact Glass Spherule Age Distributions


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dc.contributorMasatoshi Hirabayashi; mzh0114@auburn.eduen_US
dc.creatorHuang, Ya-Huei
dc.creatorMinton, David A.
dc.creatorZellner, Nicolle E. B.
dc.creatorHirabayashi, Masatoshi
dc.creatorRichardson, James E.
dc.creatorFassett, Caleb I.
dc.date.accessioned2020-05-27T21:39:33Z
dc.date.available2020-05-27T21:39:33Z
dc.date.created2018
dc.identifier10.1029/2018GL077254en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018GL077254en_US
dc.identifier.urihttp://hdl.handle.net/11200/49821
dc.description.abstractThe distributions of Ar-40/Ar-39-derived ages of impact glass spherules in lunar regolith samples show an excess at <500 Ma relative to older ages. It has not been well understood whether this excess of young ages reflects an increase in the recent lunar impact flux or is due to a bias in the samples. We developed a model to simulate the production, transport, destruction, and sampling of lunar glass spherules. A modeled bias is seen when either (1) the simulated sampling depth is 10 cm, consistent with the typical depth from which Apollo soil samples were taken, or (2) when glass occurrence in the ejecta is limited to >10 crater radii from the crater, consistent with terrestrial microtektite observations. We suggest that the observed excess of young ages for lunar impact glasses is likely due to limitations of the regolith sampling strategy of the Apollo program, rather than reflecting a change in the lunar impact rate.en_US
dc.formatPDFen_US
dc.relation.ispartofGeophysical Research Lettersen_US
dc.relation.ispartofseries0094-8276en_US
dc.rights© 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en_US
dc.subjectApollo samplesen_US
dc.subjecterosionen_US
dc.subjecteventen_US
dc.subjectimpact fluxen_US
dc.subjectimpact glass spherulesen_US
dc.subjectlong-term declineen_US
dc.subjectmeltsen_US
dc.subjectmicrotektitesen_US
dc.subjectMoonen_US
dc.subjectnumerical modelingen_US
dc.subjectprovenanceen_US
dc.subjectratesen_US
dc.subjectseaen_US
dc.titleNo Change in the Recent Lunar Impact Flux Required Based on Modeling of Impact Glass Spherule Age Distributionsen_US
dc.typeCollectionen_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume45en_US
dc.citation.issue14en_US
dc.citation.spage6805en_US
dc.citation.epage6813en_US
dc.description.statusPublisheden_US
dc.description.peerreviewYesen_US

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