ArAR — A software tool to promote the robust comparison of K–Ar and 40Ar/39Ar dates published using different decay, isotopic, and monitor-age parameters

Cameron M. Mercer, Kip Hodges

Research output: Contribution to journalArticle

12 Scopus citations


The comparison of K–Ar and 40Ar/39Ar geochronologic data published by different laboratories is markedly hindered by the inconsistent use of the parameters necessary to convert isotopic analyses to dates. This problem is particularly acute when we try to evaluate the significance of datasets obtained prior to the development of community consensus values for basic decay constants, isotopic abundances, and the ages of common monitor minerals. Unfortunately, the effect of using different parameters for the same dataset can sometimes exceed the quoted analytical precision of derived dates. We created the Argon Age Recalculator, or ArAR, to help researchers account for such discrepancies in a simple, efficient manner, allowing for more robust comparisons among datasets and more effective compilation of existing datasets using self-consistent parameter sets. ArAR is freely available as a platform independent executable application at:

Original languageEnglish (US)
Pages (from-to)148-163
Number of pages16
JournalChemical Geology
StatePublished - Nov 15 2016



  • Ar/Ar geochronology
  • K decay constants
  • ArAR
  • Argon Age Recalculator
  • K isotopic abundances
  • K–Ar Geochronology
  • Monitor minerals

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

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