Stability of (Mg0.5Fe0.5)O and (Mg0.8Fe0.2)O magnesiowustites in the lower mantle

被引：18

作者：

Dubrovinsky, L ^{[1
]}

Dubrovinskaia, N ^{[1
]}

Annersten, H ^{[1
]}

Hålenius, E ^{[1
]}

Harryson, H ^{[1
]}

机构：

[1] Uppsala Univ, Inst Earth Sci, S-75236 Uppsala, Sweden

来源：

EUROPEAN JOURNAL OF MINERALOGY | 2001年 / 13卷 / 05期

关键词：

magnesiowustite; high pressure; immiscibility; Earth's lower mantle; diamond-anvil cell;

D O I：

10.1127/0935-1221/2001/0013/0857

中图分类号：

P57 [矿物学];

学科分类号：

070901 ;

摘要：

We have heated magnesiowtistites (Mg0.5Fe0.5)O and (Mg0.8Fe0.2)O to temperatures of over 1000 K at pressures of over 80 GPa simulating the stability of the solid solution at physical conditions relevant to the Earth's lower mantle. The X-ray study of the externally heated samples in diamond-anvil cells shows that magnesiowustite may dissociate into a magnesium-rich and an iron-rich oxide component. The result is important because the decomposition of magnesiowustite into lighter and heavier phases will cause dynamic effects that could lead to mantle heterogeneity.

引用

页码：857 / 861

页数：5

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