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Reply to discussion of "Extracting K-Ar ages from shales: a theoretical test"

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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.

Keywords: END-MEMBER AGES; K-AR AGES; SHALE

Document Type: Research Article

DOI: http://dx.doi.org/10.1180/000985500546927

Publication date: June 1, 2000

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