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Diffusion of Ar-40 in muscovite

Harrison, Timothy; Celerier, Julien; Aikman, Amos; Hermann, Joerg; Heizler, Matthew T.


Hydrothermal treatment of closely sized muscovite aggregates in a piston-cylinder apparatus induced 40Ar* loss that is revealed in 40Ar/39Ar step heating spectra. Age spectra and Arrhenius data, however, differ from that expected from a single diffusion length scale. A numerical model of episodic loss assuming the presence of multiple diffusion domains yields excellent fits between synthetic and actual degassing spectra. We used this model to isolate 40Ar* loss from the grains that remained...[Show more]

CollectionsANU Research Publications
Date published: 2009
Type: Journal article
Source: Geochimica et Cosmochimica Acta
DOI: 10.1016/j.gca.2008.09.038


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