Experimental study of the phlogopite-forming reactions in the system pyrope-grossular-enstatite in the presence of the H2O-KCl fluid at 5 GPa

Авторы: Butvina V.G., Limanov E.V., Safonov O.G., Varlamov D.A.
Журнал: Experiment in GeoSciences
Том: 1
Номер: 24
Год издания: 2018
Первая страница: 63
Последняя страница: 67
Аннотация: The paper presents results on the experimental study of the reaction 5MgSiO3 + CaMg2Al2Si3O12 + [K2O + 2H2O] = K2Mg6Al2Si6O20(OH)4 + CaMgSi2O6 (enstatite + garnet + fluid = phlogopite + diopside) in the presence of a H2O-KCl fluid with starting XKCl = 0.05-0.4 at 5 GPa and temperatures of 900-1250°C. An increase in the concentration of KCl in a starting fluid results in a decrease in the amount of garnet and orthopyroxene and formation of phlogopite (± diopside), so at XKCl = 0.4, phlogopite becomes a dominant phase. The increase in the salt concentration stabilizes phlogopite to higher temperatures. Experiments have demonstrated that joint variation of the Al content in orthopyroxene and Cl in phlogopite serves as a reliable indicator of the KCl activity in the fluid and can be used to quantify it and, hence, the KCl concentration in aqueous-salt fluids in the processes of the modal mantle metasomatism.
Добавил в систему: Лиманов Евгений Владимирович

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