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dc.contributor.authorDelano, J. W.
dc.contributor.authorZellner, N. E. B.
dc.contributor.authorBarra, F.
dc.contributor.authorOlson, E.
dc.contributor.authorSwindle, T. D.
dc.contributor.authorTibbetts, N. J.
dc.contributor.authorWhittet, D. C. B.
dc.date.accessioned2021-02-12T21:41:45Z
dc.date.available2021-02-12T21:41:45Z
dc.date.issued2007-01-01
dc.identifier.citationDelano, J. W., Zellner, N. E. B., Barra, F., Olson, E., Swindle, T. D., Tibbetts, N. J., & Whittet, D. C. B. (2007). An integrated approach to understanding Apollo 16 impact glasses: Chemistry, isotopes, and shape. Meteoritics & Planetary Science, 42(6), 993-1004.
dc.identifier.issn1945-5100
dc.identifier.doi10.1111/j.1945-5100.2007.tb01146.x
dc.identifier.urihttp://hdl.handle.net/10150/656285
dc.description.abstractThe major- and minor-element abundances were determined by electron microprobe in 1039 glasses from regoliths and regolith breccias to define the compositional topology of lunar glasses at the Apollo 16 landing site in the central highlands of the Moon. While impact glasses with chemical compositions similar to local materials (i.e., Apollo 16 rocks and regoliths) are abundant, glasses with exotic compositions (i.e., transported from other areas of the Moon) account for up to ~30% of the population. A higher proportion of compositionally exotic, angular glass fragments exists when compared to compositionally exotic glass spherules. Ratios of non-volatile lithophile elements (i.e., Al, Ti, Mg) have been used to constrain the original source materials of the impact glasses. This approach is immune to the effects of open-system losses of volatile elements (e.g., Si, Na, K). Four impact glasses from one compositionally exotic group (low-Mg high-K Fra Mauro; lmHKFM) were selected for 40Ar/39Ar dating. The individual fragments of lmHKFM glass all yielded ages of ~3750 +/- 50 Ma for the time of the impact event. Based on the petrography of these individual glasses, we conclude that the likely age of the impact event that formed these 4 glasses, as well as the possible time of their ballistic arrival at the Apollo 16 site from a large and distant cratering event (perhaps in the Procellarum KREEP terrain) (Zeigler et al. 2004), is 3730 +/- 40 Ma, close to the accepted age for Imbrium.
dc.language.isoen
dc.publisherThe Meteoritical Society
dc.relation.urlhttps://meteoritical.org/
dc.rightsCopyright © The Meteoritical Society
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectLunar samples
dc.subjectglasses
dc.subjectimpacts
dc.subjectLunar geology
dc.subject40/39 Argon ages
dc.titleAn integrated approach to understanding Apollo 16 impact glasses: Chemistry, isotopes, and shape
dc.typeArticle
dc.typetext
dc.identifier.journalMeteoritics & Planetary Science
dc.description.collectioninformationThe Meteoritics & Planetary Science archives are made available by the Meteoritical Society and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform February 2021
dc.source.volume42
dc.source.issue6
dc.source.beginpage993
dc.source.endpage1004
refterms.dateFOA2021-02-12T21:41:45Z


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