Intercalibration of U-Pb and Ar-Ar chronometers -- 238U and 235U decay constants, and the electron capture and beta- 40K decay constants, and the eruption age (more precisely, kappa = 40Ar*/40K) of the Fish Canyon tuff.
First pass: weighted least squares, Renne et al. (2010-2011) data to start. These comprise
- Jaffey et al. (1971) measurements of the 238U and 235U decay constants
- Several measurements of kappaFCs
- Min et al. (2000) value of beta 40K decay constant, compiled and re-calculated from literature
- Min et al. (2000) value for electron capture 40K decay constant, compiled and re-calculated from literature
- Total 40K decay constant from liquid scintillation counting of 40K (see Renne et al. 2011 reply)
- U/Pb - Ar/Ar data pairs, starting with Table 2 of Renne et al. (2010-2011).
- U-Pb and/or Ar-Ar dates with independent constraints (historical eruptions like Vesuvius or astrochronologically tuned).