Mathematics – Logic
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1295h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 52, Issue 5, pp.1295-1303
Mathematics
Logic
18
Scientific paper
Isotope correlation diagrams can be used to obtain geologically meaningful age information from complex, seemingly meaningless, 40 Ar / 39 Ar step heating results. A violation of the common assumption that the trapped argon component has a 40 Ar / 36 Ar equal to 295.5, the atmospheric value, has been observed for K-feldspar, biotite, muscovite and hornblende, the four terrestrial minerals most commonly dated by the 40 Ar / 39 Ar method. This approach has revealed up to three separate trapped argon components in a single sample which are thermally distinct during laboratory heating; that is, as one 40 Ar / 36 Ar component is exhausted, another dominates as the trapped phase. The recognition of these trapped reservoirs of excess 40 Ar explain why many release spectra have complex patterns. When multiple trapped argon components do not remain thermally distinct during laboratory heating, only limits on age and trapped argon composition can be obtained.
Harrison Mark T.
Heizler Matthew T.
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