Liquids, Glasses, and the Melting of Silicates to High Pressures

Autor:	K. E. Windom, A. L. Boettcher, C. Wayne Burnham, S. R. Bohlen
Rok vydání:	1982
Předmět:	Fusion Diopside Mineralogy Thermodynamics Geology Silicate Dissociation (chemistry) chemistry.chemical_compound Albite chemistry Clausius–Clapeyron relation Aluminosilicate visual_art Metastability visual_art.visual_art_medium
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
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d47239de2275510b09b7f07887db4886 https://doi.org/10.1086/628658 Zobrazit plný text záznamu