Melting and crystal-liquid partitioning in the system Mg2SiO4-Fe2SiO4 to 25 GPa

Eiji Ohtani, Koji Moriwaki, Takumi Kato, Kosuke Onuma

研究成果: ジャーナルへの寄稿学術誌査読

24 被引用数 (Scopus)

抄録

The melting relation of the Mg2SiO4-Fe2SiO4 system was studied at 8.5 GPa. Olivine and spinel melts incongruently into pyroxene and the liquid in the Fe2SiO4 rich portion of the system. Olivine melts congruently at least in the compositional range from (Mg0.5Fe0.5)2SiO4 to (Mg0.9Fe0.1)2SiO4, although the end member of Mg2SiO4 ently into periclase and the liquid at pressures above 8 GPa. The melting relation of (Mg0.9Fe0.1)2SiO4 was also studied up to 25 GPa. Olivine and modified spinel of this composition melt incongruently into anhydrous phase B and liquid, and into magnesiowustite and liquid at higher temperatures in the pressure range from 18 GPa to 23 GPa. Magnesiowustite is the liquidus phase at higher pressures at least up to 25 GPa in this composition. The partition coefficients between crystal and liquid are; DMg = 1.19(± 0.06), DSi = 0.88(± 0.04), DV = 0.63(± 0.16), DCr = 1.04(,.9p\ 0.21), DMn = 0.42(± 0.08), DFe = 0.76(± 0.07), DCo = 1.24(± 0.44), DNi = 1.46(± 0.81) for modified spinel; DMg = 1.41(± 0.06), DSi = 0.72(± 0.03), DV = 0.44(± 0.11), DCr = 0.94(± 0.12), DMn - 0.30(± 0.07), DFe - 0.56(± 0.06), DCo = 1.19(± 0.30), DNi = 1.65(± 0.87) for anhydrous phase B; DMg = 2.09(± 0.11), DV = 0.64(± 0.06), DCr = 1.01(± 0.05), DMn = 0.7(± 0.04), DFe = 1.45(± 0.08), DCo = 2.73(± 0.15), DNi = 4.72(± 0.25) for magnesiowustite. The present results of melting relations and partitioning are applied for the fractionation in the mantles of the terrestrial planets, such as Mars and Mercury.

本文言語英語
ページ(範囲)75-82
ページ数8
ジャーナルPhysics of the Earth and Planetary Interiors
107
1-3
DOI
出版ステータス出版済み - 4月 15 1998
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 天文学と天体物理学
  • 地球物理学
  • 物理学および天文学(その他)
  • 宇宙惑星科学

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