(Energetics of silicate melts from thermal diffusion studies)
Research during the past year has been concentrated in four major areas. We are continuing work initiated during the first two years on modelling thermal diffusion on multicomponent silicate liquids. We have derived appropriate relations for ternary and quaternary systems and reanalyzed experimental thermal diffusion data for the ternary system fayalite-leucite-silica. In our manuscript entitled Thermal Diffusion in Petrology'', to be published in Adv. in Phy. Geochem., we show that these model results independently recover the compositional extent and temperature of liquid immiscibility in this system. Such retrieval provides a rigorous test of our theoretical predictions and simplified treatment of complex silicate liquids reported in Geochimica Cosmochimica Acta in 1986. The usefulness of our Soret research in providing mixing energies of silicate liquids has been recently confirmed by Ghiorso (1987, Cont. Min. Pet.). This demonstration provides a strategy for incorporating Soret data into the calibration of phase equilibrium-based solution models such as the one developed by Ghiorso. During the past year we also have resumed our studies of thermal diffusion in borosilicate glasses which also exhibit liquid immiscibility. Our objectives in studying these systems are (1) to further test of our multicomponent thermal diffusion model and (2) to provide quantitative constraints on the mixing properties of these glass-forming systems which are important for evaluating their suitability for storage of high-level nuclear waste. 16 refs.
- Research Organization:
- Columbia Univ., Palisades, NY (USA). Lamont-Doherty Geological Observatory
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- FG02-84ER13287
- OSTI ID:
- 5097466
- Report Number(s):
- DOE/ER/13287-4; ON: DE90005559
- Country of Publication:
- United States
- Language:
- English
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(Energetics of silicate melts from thermal diffusion studies)
(Energetics of silicate melts from thermal diffusion studies): Progress report for the second year's activities, January--December 1988