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

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorLaurenzi, Marinella A.
dc.creatorBalestrieri, Maria Laura
dc.creatorBigazzi, Giulio
dc.creatorNeto, Julio C. Hadler
dc.creatorIunes, Pedro J.
dc.creatorNorelli, Pio
dc.creatorOddone, Massimo
dc.creatorOsorio Araya, Ana Maria
dc.creatorViramonte, Jose G.
dc.date2014-05-20T13:22:56Z
dc.date2016-10-25T16:44:02Z
dc.date2014-05-20T13:22:56Z
dc.date2016-10-25T16:44:02Z
dc.date2007-06-01
dc.date.accessioned2017-04-05T19:55:57Z
dc.date.available2017-04-05T19:55:57Z
dc.identifierGeostandards and Geoanalytical Research. Malden: Wiley-blackwell, v. 31, n. 2, p. 105-124, 2007.
dc.identifier1639-4488
dc.identifierhttp://hdl.handle.net/11449/6828
dc.identifierhttp://acervodigital.unesp.br/handle/11449/6828
dc.identifier10.1111/j.1751-908X.2007.00844.x
dc.identifierWOS:000247205300004
dc.identifierhttp://dx.doi.org/10.1111/j.1751-908X.2007.00844.x
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/855647
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.languageeng
dc.publisherWiley-Blackwell
dc.relationGeostandards and Geoanalytical Research
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectfission-track dating
dc.subject(40)Ar/(39)Ar dating
dc.subjectnatural glasses
dc.subjectage standards
dc.titleNew constraints on ages of glasses proposed as reference materials for fission-track dating
dc.typeOtro


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