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An early I-Xe age for CB chondrite chondrule formation, and a re-evaluation of the closure age of Shallowater enstatite

dc.contributor.authorGilmour, J. D.
dc.contributor.authorCrowther, S. A.
dc.contributor.authorBusfield, A.
dc.contributor.authorHolland, G.
dc.contributor.authorWhitby, J. A.
dc.date.accessioned2021-02-12T22:53:36Z
dc.date.available2021-02-12T22:53:36Z
dc.date.issued2009-01-01
dc.identifier.citationGilmour, J. D., Crowther, S. A., Busfield, A., Holland, G., & Whitby, J. A. (2009). An early I‐Xe age for CB chondrite chondrule formation, and a re‐evaluation of the closure age of Shallowater enstatite. Meteoritics & Planetary Science, 44(4), 573-579.
dc.identifier.issn1945-5100
dc.identifier.doi10.1111/j.1945-5100.2009.tb00752.x
dc.identifier.urihttp://hdl.handle.net/10150/656560
dc.description.abstractThe iodine-xenon system has been analyzed in samples of 7 chondrules from the CB chondrites Gujba and Hammadah al Hamra (HaH) 237. One sample from Gujba defined a high temperature iodine-xenon isochron corresponding to closure 1.87 +/- 0.4 Ma before closure of Shallowater enstatite. Motivated by this result, we employ outlier rejection to re-evaluate the Shallowater age, leading to a modified value of 4562.3 +/- 0.4 Ma (1). In this process, the datum obtained by combining our I-Xe age for Gujba with the literature Pb-Pb age is rejected as an outlier, indicating that in this sample the I-Xe system closed earlier than the accepted Pb-Pb age of chondrules from CB chondrites. The need for a formation environment distinct from that of chondrules from other meteorites is thus reduced.
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.subjectxenon
dc.subjectIodine-xenon ages
dc.subjectchondrule formations
dc.subjectchronology
dc.titleAn early I-Xe age for CB chondrite chondrule formation, and a re-evaluation of the closure age of Shallowater enstatite
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.volume44
dc.source.issue4
dc.source.beginpage573
dc.source.endpage579
refterms.dateFOA2021-02-12T22:53:36Z


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