Effect of high pressure on the melting relation of the Fe2SiO4-FeSiO3 system

Takumi Kato, Eiji Ohtani, Mineo Kumazawa

研究成果: ジャーナルへの寄稿学術誌査読

4 被引用数 (Scopus)


The melting relation of the Fe2SiO4(Fa)-FeSiO3(Fs) system has been studied at pressures of 5, 6, and 9 GPa. This pseudo-binary system shows an eutectic melting between fayalite and ferrosilite, and ferrosilite is observed to melt in-congruently into coesite plus melt at all pressures studied. The eutectic point of this system is determined as Fa74Fs26 and 1,335±15°C at 6 GPa, and Fa55Fs45 and 1,530±20°C at 9 GPa, where spinel phase emerges in place of fayalite as a liquidus phase of the Fe2SiO4-rich portion of the system. The peritectic point, where the liquidus surface of ferrosilite intersects with that of coesite, is determined as Fa35Fs65 and 1,435 ±35°C at 6 GPa, and Fa15Fs85 and 1,610±30°C at 9 GPa. On the basis of the melting curves for iron silicate minerals, the liquidus relation of the FeO-SiO2 system is extrapolated to higher pressures. The result demonstrates the large influence of phase transitions in the constituent minerals on the melting relation.

ジャーナルjournal of physics of the earth
出版ステータス出版済み - 1月 1984

!!!All Science Journal Classification (ASJC) codes

  • 地球惑星科学(全般)


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