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dc.contributor.CRUESPUniversidade Estadual de Campinaspt_BR
dc.typeArtigo de periódicopt_BR
dc.titleNew constraints on ages of glasses proposed as reference materials for fission-track datingpt_BR
dc.contributor.authorLaurenzi, MApt_BR
dc.contributor.authorBalestrieri, MLpt_BR
dc.contributor.authorBigazzi, Gpt_BR
dc.contributor.authorNeto, JCHpt_BR
dc.contributor.authorIunes, PJpt_BR
dc.contributor.authorNorelli, Ppt_BR
dc.contributor.authorOddone, Mpt_BR
dc.contributor.authorAraya, AMOpt_BR
dc.contributor.authorViramonte, JGpt_BR
unicamp.author.emailm.laurenzi@igg.cnr.itpt_BR
unicamp.authorCNR, Ist Geosci & Georisorse, I-56124 Pisa, Italy Univ Estadual Campinas, Inst Fis, Dept Raios Cosm & Cronol, BR-13083970 Campinas, SP, Brazil Univ Pavia, Dipartimento Chim Gen, I-27100 Pavia, Italy Univ Estado Sao Paulo, UNESP, Dept Fis Quim & Biol, BR-19060900 Presidente Prudente, SP, Brazil Univ Nacl Salta, Inst Geonorte, RA-4400 Salta, Argentinapt_BR
dc.subjectfission-track datingpt_BR
dc.subject(40)Ar/(39)Ar datingpt_BR
dc.subjectnatural glassespt_BR
dc.subjectage standardspt_BR
dc.subject.wosAr-40/ar-39 Agept_BR
dc.subject.wosArgon-40/argon-39 Agespt_BR
dc.subject.wosObsidian Artifactspt_BR
dc.subject.wosNeutron Dosimetrypt_BR
dc.subject.wosDecay Constantspt_BR
dc.subject.wosImpact Eventpt_BR
dc.subject.wosTephra Bedspt_BR
dc.subject.wosNew-zealandpt_BR
dc.subject.wosThin-filmspt_BR
dc.subject.wosSe Perupt_BR
dc.description.abstractNew analyses have been performed in order to enhance the data-set on the independent ages of four glasses that have been proposed as reference materials for fission-track dating. The results are as follows. Moldavite - repeated (40)Ar/(39)Ar age determinations on samples from deposits from Bohemia and Moravia yielded an average of 14.34 +/- 0.08 Ma. This datum agrees with other recent determinations and is significantly younger than the (40)Ar/(39)Ar age of 15.21 +/- 0.15 Ma determined in the early 1980s. Macusanite (Peru) -four K-Ar ages ranging from 5.44 +/- 0.06 to 5.72 +/- 0.12 Ma have been published previously. New (40)Ar/(39)Ar ages gave an average of 5.12 +/- 0.04 Ma. Plateau fission-track ages determined using the IRMM-540 certified glass and U and Th thin films for neutron fluence measurements agree better with these new (40)Ar/(39)Ar ages than the previously published ages. Roccastrada glass (Italy) - a new (40)Ar/(39)Ar age, 2.45 +/- 0.04 Ma, is consistent with previous determinations. The Quiron obsidian (Argentina) is a recently discovered glass that has been proposed as an additional reference material for its high spontaneous track density (around 100 000 cm(-2)). Defects that might produce "spurious" tracks are virtually absent. An independent (40)Ar/(39)Ar age of 8.77 +/- 0.09 Ma was determined and is recommended for this glass. We believe that these materials, which will be distributed upon request to fission-track groups, will be very useful for testing system calibrations and experimental procedures.pt
dc.relation.ispartofGeostandards And Geoanalytical Researchpt_BR
dc.relation.ispartofabbreviationGeostand. Geoanal. Res.pt_BR
dc.publisher.cityMaldenpt_BR
dc.publisher.countryEUApt_BR
dc.publisherWiley-blackwellpt_BR
dc.date.issued2007pt_BR
dc.date.monthofcirculationJUNpt_BR
dc.identifier.citationGeostandards And Geoanalytical Research. Wiley-blackwell, v. 31, n. 2, n. 105, n. 124, 2007.pt_BR
dc.language.isoenpt_BR
dc.description.volume31pt_BR
dc.description.issuenumber2pt_BR
dc.description.initialpage105pt_BR
dc.description.lastpage124pt_BR
dc.rightsfechadopt_BR
dc.rights.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.htmlpt_BR
dc.sourceWeb of Sciencept_BR
unicamp.cruespUNESPpt_BR
dc.identifier.issn1639-4488pt_BR
dc.identifier.wosidWOS:000247205300004pt_BR
dc.identifier.doi10.1111/j.1751-908X.2007.00844.xpt_BR
dc.date.available2014-11-17T10:15:39Z
dc.date.available2015-11-26T16:42:11Z-
dc.date.accessioned2014-11-17T10:15:39Z
dc.date.accessioned2015-11-26T16:42:11Z-
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dc.description.provenanceMade available in DSpace on 2015-11-26T16:42:11Z (GMT). No. of bitstreams: 2 WOS000247205300004.pdf: 233476 bytes, checksum: 8fc0db706a06cca7ee29e0dd82d3eb50 (MD5) WOS000247205300004.pdf.txt: 80812 bytes, checksum: 8822467b40585c2a4a09316ca8313426 (MD5) Previous issue date: 2007en
dc.identifier.urihttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/66072pt_BR
dc.identifier.urihttp://www.repositorio.unicamp.br/handle/REPOSIP/66072
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/66072-
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