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Diffusion of a multi-species component and its role in oxygen and water transport in silicatesThe diffusion of a multispecies component is complicated by the different diffusion coefficient of each species and the interconversion reactions among the species. A diffusion equation is derived that incorporates the diffusive fluxes of all species contributing to the component's concentration. The effect of speciation on diffusion is investigated experimentally by measuring concentration profiles of all species developed during diffusion experiments. Data on water diffusion in rhyolitic glasses indicate that H2O molecules predominate over OH groups as the diffusing species at very low to high water concentrations. A simple theoretical relationship is drawn between the effective total oxygen diffusion coefficient and the total water concentration of silicates at low water content.
Document ID
19910055025
Document Type
Reprint (Version printed in journal)
Authors
Zhang, Youxue (California Inst. of Tech. Pasadena, CA, United States)
Stolper, E. M. (California Inst. of Tech. Pasadena, CA, United States)
Wasserburg, G. J. (California Institute of Technology Pasadena, United States)
Date Acquired
August 15, 2013
Publication Date
April 1, 1991
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 103
Issue: 4-Jan
ISSN: 0012-821X
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAGW-1472
CONTRACT_GRANT: NSF EAR-89-16707
CONTRACT_GRANT: DE-FG03-88ER-13851
Distribution Limits
Public
Copyright
Other