Abstract
The temperature of reaction for kaolinite + quartz=pyrophyllite, kaolinite=andalusite +pyrophyllite and pyrophyllite=andalusite+quartz, have been determined for total pressures near 1000 and 2000 bars, in the presence of H2O. Using these determinations and a compilation of previously existing work in the system Al2O3-SiO2-H2O, a phase diagram has been constructed in P.T. space which indicates four invariant points involving 11 univariant reactions. This analysis outlines the stability limits for the hydrous aluminiumsilicates in the pressure-temperature range up to 6kbs. and 550° C.
Résumé
Les températures de réaction des relations: kaolinite+quartz=pyrophyllite; kaolinite=andalousite+pyrophyllite et pyrophyllite=andalousite+quartz ont été déterminées pour des pressions totales de 1000 et 2000 bars, en présence d'eau. A partir de ces données et de celles des travaux antérieurs sur le système Al2O3-SiO2-H2O, un diagramme de phase comportant 4 points invariants, mettant en jeu 11 réactions univariantes, a été construit dans un espace P.T. Cette analyse permet de prévoir les limites de stabilité des silicates d'alumine hydratés dans un domaine de températures et de pressions allant jusqu'à 6 kbs. et 550° C.
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Equipe de recherche ≪Pétrogénèse des roches éruptives et métamorphiques≫, associée au C.N.R.S.
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Velde, B., Kornprobst, J. Stabilité des silicates d'alumine hydratés. Contr. Mineral. and Petrol. 21, 63–74 (1969). https://doi.org/10.1007/BF00377418
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DOI: https://doi.org/10.1007/BF00377418