K-richterite  formation in the presence of K2CO3-Na2CO3- CО2-H2O fluid. Experiment at 3 GPa

Авторы: Limanov E.V., Butvina V.G., Safonov O.G., Van, Vorobey S.S.
Журнал: Experiment in GeoSciences
Том: 27
Номер: 1
Год издания: 2021
Первая страница: 54
Последняя страница: 56
Аннотация: The reaction 8En + Di + [1/2K2O + 1/2Na2O + H2O] = K-Rct + 2Fo was studied experimentally the presence of a K2CO3-Na2CO3-CO2-H2O fluid a temperature of 1000°C and a pressure of 3 GPa. The amphibole formation was possible at a weight ratio (K2CO3 + Na2CO3) / (CO2 + H2O) = 3/7, at Na2CO3/K2CO3 = 50/50 and 70/30. In a situation where potassium dominates over sodium, amphibole is formed only at (K2CO3 + Na2CO3) / (CO2-H2O) = 10/90. Аmphibole becomes unstable with an increase in the content of alkaline components in the fluid, a large amount of alkaline melt is present in the system. The regularities obtained in the work reproduce well the features of mineral associations and variations in component compositions in the upper mantle peridotites.
Добавил в систему: Лиманов Евгений Владимирович

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