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dc.contributor.authorGuan, Yunbin
dc.contributor.authorHuss, Gary R.
dc.contributor.authorLeshin, Laurie A.
dc.contributor.authorMacPherson, Glenn J.
dc.contributor.authorMcKeegan, Kevin D.
dc.date.accessioned2021-02-12T21:40:13Z
dc.date.available2021-02-12T21:40:13Z
dc.date.issued2006-01-01
dc.identifier.citationGuan, Y., Huss, G. R., Leshin, L. A., MacPherson, G. J., & McKeegan, K. D. (2006). Oxygen isotope and 26Al‐26Mg systematics of aluminum‐rich chondrules from unequilibrated enstatite chondrites. Meteoritics & Planetary Science, 41(1), 33-47.
dc.identifier.issn1945-5100
dc.identifier.doi10.1111/j.1945-5100.2006.tb00191.x
dc.identifier.urihttp://hdl.handle.net/10150/656088
dc.description.abstractCorrelated in situ analyses of the oxygen and magnesium isotopic compositions of aluminum-rich chondrules from unequilibrated enstatite chondrites were obtained using an ion microprobe. Among eleven aluminum-rich chondrules and two plagioclase fragments measured for 26Al-26Mg systematics, only one aluminum-rich chondrule contains excess 26Mg from the in situ decay of 26Al; the inferred initial ratio (26Al/27Al)o = (6.8 +/- 2.4) x 10^(-6) is consistent with ratios observed in chondrules from carbonaceous chondrites and unequilibrated ordinary chondrites.The oxygen isotopic compositions of five aluminum-rich chondrules and one plagioclase fragment define a line of slope ~0.6 +/- 0.1 on a three-oxygen-isotope diagram, overlapping the field defined by ferromagnesian chondrules in enstatite chondrites but extending to more 16O-rich compositions with a range in delta-18O of about ~12 ppm. Based on their oxygen isotopic compositions, aluminum-rich chondrules in unequilibrated enstatite chondrites are probably genetically related to ferromagnesian chondrules and are not simple mixtures of materials from ferromagnesian chondrules and calcium-aluminum-rich inclusions (CAIs).Relative to their counterparts from unequilibrated ordinary chondrites, aluminum-rich chondrules from unequilibrated enstatite chondrites show a narrower oxygen isotopic range and much less resolvable excess 26Mg from the in situ decay of 26Al, probably resulting from higher degrees of equilibration and isotopic exchange during post-crystallization metamorphism. However, the presence of 26Al-bearing chondrules within the primitive ordinary, carbonaceous, and now enstatite chondrites suggests that 26Al was at least approximately homogeneously distributed across the chondrite-forming region.
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.subjectShort-lived isotope 26A1
dc.subjectaluminum-rich Chondrules
dc.subjectoxygen isotopes
dc.subjectenstatite chondrites
dc.titleOxygen isotope and 26Al-26Mg systematics of aluminum-rich chondrules from unequilibrated enstatite chondrites
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.volume41
dc.source.issue1
dc.source.beginpage33
dc.source.endpage47
refterms.dateFOA2021-02-12T21:40:13Z


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