New constraints on ages of glasses proposed as reference materials for fission-track dating

dc.creatorLaurenzi, MA
dc.creatorBalestrieri, ML
dc.creatorBigazzi, G
dc.creatorNeto, JCH
dc.creatorIunes, PJ
dc.creatorNorelli, P
dc.creatorOddone, M
dc.creatorAraya, AMO
dc.creatorViramonte, JG
dc.date2007
dc.dateJUN
dc.date2014-11-17T10:15:39Z
dc.date2015-11-26T16:42:11Z
dc.date2014-11-17T10:15:39Z
dc.date2015-11-26T16:42:11Z
dc.date.accessioned2018-03-28T23:26:38Z
dc.date.available2018-03-28T23:26:38Z
dc.identifierGeostandards And Geoanalytical Research. Wiley-blackwell, v. 31, n. 2, n. 105, n. 124, 2007.
dc.identifier1639-4488
dc.identifierWOS:000247205300004
dc.identifier10.1111/j.1751-908X.2007.00844.x
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/66072
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/66072
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/66072
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1273178
dc.descriptionNew 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.
dc.description31
dc.description2
dc.description105
dc.description124
dc.languageen
dc.publisherWiley-blackwell
dc.publisherMalden
dc.publisherEUA
dc.relationGeostandards And Geoanalytical Research
dc.relationGeostand. Geoanal. Res.
dc.rightsfechado
dc.rightshttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
dc.sourceWeb of Science
dc.subjectfission-track dating
dc.subject(40)Ar/(39)Ar dating
dc.subjectnatural glasses
dc.subjectage standards
dc.subjectAr-40/ar-39 Age
dc.subjectArgon-40/argon-39 Ages
dc.subjectObsidian Artifacts
dc.subjectNeutron Dosimetry
dc.subjectDecay Constants
dc.subjectImpact Event
dc.subjectTephra Beds
dc.subjectNew-zealand
dc.subjectThin-films
dc.subjectSe Peru
dc.titleNew constraints on ages of glasses proposed as reference materials for fission-track dating
dc.typeArtículos de revistas


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