The mechanism of solution of aluminum oxide in MgSiO3 perovskite

被引：29
|
作者：
Stebbins, JF [1 ]
Kroeker, S
Andrault, D
机构：
[1] Stanford Univ, Dept Geol & Environm Sci, Stanford, CA 94305 USA
[2] IPGP, Lab Geomat, F-75252 Paris, France
来源：
GEOPHYSICAL RESEARCH LETTERS | 2001年 / 28卷 / 04期
关键词：
D O I：
10.1029/2000GL012279
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
We report Al-27 and Si-29 Nuclear Magnetic Resonance (NMR) spectra, collected at magnetic fields of 14.1 and 18.8 Tesla on samples as small as 1 mg, for Al-bearing MgSiO3 perovskite synthesized at 26-28 GPa. For Al, we find a 1:1 ratio of two types of sites: a symmetrical, octahedral site and a low symmetry, distorted site that is most likely to be Al in modifications of normally eight-coordinated Mg sites. A charge coupled substitution of 2 Al for one Si and one Mg cation is strongly supported as the predominant mechanism in this pressure range.
引用
收藏
页码：615 / 618
页数：4
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