Experimental study of the reaction of K-richterite formation at 3 GPa and 1000°C

Limanov, E.V.; Butvina, V.G.; Safonov, O.G.; Ван К, В.; Vorobei, S.S.

Авторы: Limanov E.V., Butvina V.G., Safonov O.G., Ван К В., Vorobei S.S.
Журнал: Experiment in GeoSciences
Том: 28
Номер: 1
Год издания: 2022
Первая страница: 57
Последняя страница: 59
Аннотация: High degrees of modal mantle metasomatism lead to the formation of K-richterite, which is stable over a wide range of temperatures and pressures. Its appearance is due to the reaction 8En + Di + [1/2K2O +1/2Na2O + H2O] = K-Rct + 2Fo, which was studied experimentally in the presence of fluid K2CO3-Na2CO3-CO2-H2O at a temperature of 1000°C and a pressure of 3 GPa, at different Na/K ratios. At Na/K = 50/50 and 70/30, amphibole is formed at (K2CO3+Na2CO3)/(H2O+CO2) = 30/70. With an increase in the activity of alkaline components, decomposition of clinopyroxene occurs, as well as a shift in the composition of amphibole in the case of Na/K = 50/50 towards K-richterite, and in the case of Na/K = 70/30 towards sodium analogues. In the Na/K = 30/70 system, the appearance of amphibole turned out to be impossible only at (K2CO3+Na2CO3)/(H2O+CO2) = 20/80 and 30/70. Its presence at lower and higher alkali contents may be due to the alternating effect of the activity of water and alkaline components on the stability of amphibole. It has been established that the formation of K-richterite depends not only on the alkalinity of the fluid, but also on the ratio of the alkaline components themselves.
Добавил в систему: Лиманов Евгений Владимирович

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Experimental study of the reaction of K-richterite formation at 3 GPa and 1000°Cстатья

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