Computer Science
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.103..156c&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 103, no. 1-4, April 1991, p. 156-168.
Computer Science
11
Argon, Gaseous Diffusion, Rhyolite, Silica Glass, Activation Energy, Magma, Pressure Dependence, Silicates, Temperature Dependence
Scientific paper
The paper provides fresh experimental findings on the diffusion of Ar in a natural rhyolite obsidian and in synthetic glasses of albite and orthoclase composition at 400-900 C and at pressures between 1100 and 3700 bar. These data can facilitate the understanding of how kinetic factors may influence noble gas abundances during degasing of magmas and of how thermal history may affect the whole-rock K-Ar dating of young volcanic rocks. A natural rhyolitic obsidian and two synthetic glasses with nominal compositions of NaAlSi3O8 and KAlSi3 were used in experiments conducted in cold seal pressure vessels with Ar gas as the pressurizing medium. Noble gases are found to show lower activation energies for diffusion than are observed for tracer diffusions of cations with comparable radii. He and Ne are shown to diffuse faster than CO2. Kinetic factors are argued to influence noble gas abundance patterns during separation of a CO2-rich vapor phase from degasing basaltic magma during ascent.
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