Experimental study of the chromite-rutile / ilmenite-K2CO3-H2O-CO2 system at 2 GPa: an application to the mantle metasomatism

Butvina, V.G.; Kosova, S.A.; Safonov, O.G.

Авторы: Butvina V.G., Kosova S.A., Safonov O.G.
Журнал: Experiment in GeoSciences
Том: 27
Номер: 1
Год издания: 2021
Первая страница: 35
Последняя страница: 38
Аннотация: Formation of K-Na phases, where alkalis are bound to Cr, Ti, Fe3+, as a result of metasomatism in the upper mantle peridotites usually corresponds to later stages of metasomatic transformation. These phases are various K-Na-Ba-bearing titanates with a high chromium content, such as minerals of the mathiasite-lindsleyite and hawthorneite-yimengite groups and priderite. Experimental data on the stability of K-Ba-titanates are presented by a few works on their synthesis from mixtures of simple oxides and only limit the range of P-T conditions for their possible formation (Foley et al., 1994; Konzett et al., 2005). Our experiments showed a fundamental possibility of the formation of these titanates as a result of the reactions of chromite with aqueous-potassium carbonate fluids at 3.5 and 5 GPa and confirmed a wide range of existence of various titanates with respect to the fluid composition. Experiments at 2 GPa and 1000-1200C showed that K-Cr priderite can crystallize in a wide range of temperatures and pressures (1.8-5 GPa) together with mathiasite, however, in a system rich in Fe (chromite-ilmenite-K2CO3-H2O-CO2), at pressures above 3.5 GPa, crystallization of yimengite and mathiasite is preferable.
Добавил в систему: Лиманов Евгений Владимирович

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Experimental study of the chromite-rutile / ilmenite-K2CO3-H2O-CO2 system at 2 GPa: an application to the mantle metasomatismстатья

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