Interpretation of a discordant K-Ar age pattern (Capo Vaticano, Calabria)

Details Interpretation of a discordant K-Ar age pattern (Capo Vaticano, Calabria) Interpretation of a discordant K-Ar age pattern (Capo Vaticano, Calabria)

Sep 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973e%26psl..20..113c&link_type=abstract

Earth and Planetary Science Letters, Volume 20, Issue 1, p. 113-118.

Computer Science

1

Scientific paper

K-Ar age determination on whole rocks, biotites, quartz-feldspar separates and pegmatitic muscovites from a small quartz dioritic stock give a complex discordant age pattern. K-Ar dates from whole rocks and mineral separates define a single 116 my isochron with positive intercept, whereas muscovites from pegmatites fit a 180 my isochron with a probable negative intercept. Both ages are younger than the probable crystallization age of the stock (around 300 my), indicating a complex post-crystallization history. The fit of different mineral phases and whole rocks to a single isochron with positive intercept suggests that a thermal event caused rehomogenization of Ar among different mineral phases.

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