Experimental study of the melting of the SiO2-MgO-FeO model composition, in the presence of graphite and calcium carbonate, at high thermodynamic parameters

Авторы: Rusak A.A., Lukanin O.A., Kononkova N.N., Kargaltsev A.A.
Журнал: Experiment in GeoSciences
Том: 27
Номер: 1
Год издания: 2021
Первая страница: 98
Последняя страница: 101
Аннотация: The first experiments were carried out in the SiO2-MgO-FeO system in the presence of calcium carbonate and graphite phases at a temperature of 1500 – 1600 °C and pressures of 2.5 – 3.5 GPa. The experiments were carried out on a high-pressure unit NL-13T with a toroidal seal of the "anvil with a hole" type with an exposure time of 40 minutes. The zonal structure of the samples was found in the experimental products. The central zone is composed of basic glass and small quartz crystals, and the marginal zone is composed of calcium pyroxene crystals and rounded graphite crystals. At a higher pressure, the central part is depleted of quartz crystals. There is a direct dependence of the SiO2 –FeO concentrations at T = 1600 °C and P = 3 GPa. In glass without quartz, the FeO content is less than in glass with small quartz crystals. No separate metallic iron droplets were formed in the system, since the oxygen volatility was higher than the iron-wustite buffer (fO2 > IW).This result is a case of crystallization in the region of instability of the metal phase.
Добавил в систему: Русак Александра Андреевна

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