Reply to discussion of "Extracting K-Ar ages from shales: a theoretical test"
Author: Srodon, J.
Source: Clay Minerals, Volume 35, Number 3, 1 June 2000 , pp. 605-608(4)
Publisher: Mineralogical Society
Abstract:As plots of K-Ar ages vs. percentage of the detrital component of mineral mixtures containing a detrital and a diagenetic illite (or illite-smectite) have different curved shapes, the linear extrapolation method of extracting the end-member ages is not justified. The curvature depends on the difference in K2O contents; thus it can be minimized if the percentage of detrital illite is normalized to the sum of detrital illite plus illitic fraction of diagenetic illite-smectite.
Document Type: Research Article
Publication date: June 1, 2000