Diffusion of Ar-40 in muscovite
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]
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|Source:||Geochimica et Cosmochimica Acta|
|01_Harrison_Diffusion_of_Ar-40_in_2009.pdf||631.45 kB||Adobe PDF||Request a copy|
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