Liquids, Glasses, and the Melting of Silicates to High Pressures
Autor: | K. E. Windom, A. L. Boettcher, C. Wayne Burnham, S. R. Bohlen |
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Rok vydání: | 1982 |
Předmět: | |
Zdroj: | The Journal of Geology. 90:127-138 |
ISSN: | 1537-5269 0022-1376 |
Popis: | Processes involving melting have been of fundamental importance in the origin and evolution of the Earth and other terrestrial planets, but thermodynamic data and physical properties of liquids necessary to calculate phase relationships are not well known, particularly at high pressures. We present revised fusion curves of the silicate diopside and the aluminosilicate albite to 30 kbars. The fusion curve of diopside is in agreement with that calculated with the Clapeyron equation. Conversely, we were able to calculate the fusion curve of albite only by considering the effects of pressure and temperature in lowering the activity of NaAlSi3O8 component in the liquid, which presumably results from partial dissociation of this component into other species. Our experimental data corroborate that thermodynamic and, presumably, structural changes occur in aluminosilicate liquids with changes in pressure as well as with temperature, and they provide evidence that the metastable persistence of high-enthalpy struct... |
Databáze: | OpenAIRE |
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