PUMA
Istituto di Geoscienze e Georisorse     
Laurenzi M., Balestrieri M., Bigazzi G., Hadler Neto J., Iunes P., Norelli P., Oddone M., Osorio Araya A., Viramonte J. New constraints on ages of glasses proposed as reference materials for fission-track dating. In: Geostandards and Geoanalytical Research, vol. 31 (2) pp. 105 - 124. Wiley, 2007.
 
 
Abstract
(English)
New 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 40Ar/39Ar 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 40Ar/39Ar 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 40Ar/39Ar 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 40Ar/39Ar ages than the previously published ages. Roccastrada glass (Italy) - a new 40Ar/39Ar 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
URL: http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1751-908X/
Subject fission-track dating
40Ar/39Ar dating
natural glasses
age standards


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