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dc.contributor.authorEugster, O.
dc.contributor.authorBusemann, H.
dc.contributor.authorLorenzetti, S.
dc.contributor.authorTerribilini, D.
dc.date.accessioned2021-02-12T20:55:46Z
dc.date.available2021-02-12T20:55:46Z
dc.date.issued2002-01-01
dc.identifier.citationEugster, O., Busemann, H., Lorenzetti, S., & Terribilini, D. (2002). Ejection ages from krypton‐81‐krypton‐83 dating and pre‐atmospheric sizes of martian meteorites. Meteoritics & Planetary Science, 37(10), 1345-1360.
dc.identifier.issn1945-5100
dc.identifier.doi10.1111/j.1945-5100.2002.tb01033.x
dc.identifier.urihttp://hdl.handle.net/10150/655572
dc.description.abstractCosmic-ray exposure (CRE) ages and Mars ejection times were calculated from the radionuclide 81Kr and stable Kr isotopes for seven martian meteorites. The following 81Kr-Kr CRE ages were obtained: Los Angeles = 3.35 +/- 0.70 Ma; Queen Alexandra Range 94201 = 2.22 +/- 0.35 MA; Shergotty = 3.05 +/- 0.50 Ma; Zagami = 2.98 +/- 0.30 Ma; Nakhla = 10.8 +/- 0.8 Ma; Chassigny = 10.6 +/- 2.0 Ma; and Allan Hills 84001 = 15.4 +/- 5.0 Ma. Comparison of these age with previously obtained CRE ages from the stable noble gas nuclei 3He, 21Ne, and 38Ar shows excellent agreement. This indcates that the method for the production rate calculation for the stable nuclei is reliable. in all martian meteorites we observe effects induced by secondary cosmic-ray produced epithermal neutrons. Epithermal neutron fluxes, phi(n) (30-300 cV), are calculated based on the reaction 79Br(n, gamma x Beta)80Kr. We show that the neutron capture effects were induced in free space during Mars-Earth transfer of the meteorids and that they are not due to a pre-exposure on Mars before ejection of the meteoritic material. Neutron fluxes and slowing down densities experienced by the meteoroids are calculated and pre-atmospheric sizes are estimated. We obtain minimum radii in the range of 22-25 cm and minimum masses of 150-220 kg. These results are in good agreement with the mean sizes reported for model calculations using current semiempirical data.
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.subjectNakhla
dc.subjectChassigny
dc.subjectZagami
dc.subjectShergotty
dc.subjectQueen Alexandra Range 94201
dc.subjectLos Angeles
dc.subjectkrypton-83
dc.subjectkrypton-81
dc.subjectejection ages
dc.subjectMartian meteorites
dc.titleEjection ages from krypton-81-krypton-83 dating and pre-atmospheric sizes of martian meteorites
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.volume37
dc.source.issue10
dc.source.beginpage1345
dc.source.endpage1360
refterms.dateFOA2021-02-12T20:55:46Z


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