On the use of 60°C "cooling ages" obtained using projected fission-track lengths in apatite

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doi: 10.1016/0009-2541(94)90093-0
Authors:Coyle, David A.; Powell, Roger
Author Affiliations:Primary:
La Trobe University, Department of Geology, Bundoora, Victoria, Australia
University of Melbourne, Parkville, Victoria, Australia
Volume Title:Chemical Geology
Source:Chemical Geology, 111(1-4), p.263-267. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541
Publication Date:1994
Note:In English. Includes appendix. 22 refs.; illus.
Summary:The estimation of fission-track ages using counts of projected track lengths, in particular, 60°C cooling ages, is based on determining the proportion of tracks greater than a particular length. We show that errors on 60°C cooling ages are significantly greater than have been previously estimated; for example, a minimum error on such ages as they are conventionally determined, is ±22% at the 95% confidence level. In addition, the equation used to determine projected track length ages, involving a constant relationship between track shortening, conventional age reduction, and the proportion of projected track lengths greater than 10 µm, is shown not to apply generally. It is recommended that the practise of estimating 60°C cooling ages using projected track length distributions be substantially re-evaluated.
Subjects:Apatite; Cooling; Errors; Fission tracks; Fission-track dating; Geochronology; Phosphates; Temperature
Abstract Numbers:94M/3936
Record ID:1994017205
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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