Effect of water on the spinel-postspinel transformation in Mg2SiO4

被引：68

作者：

Higo, Y ^{[1
]}

Inoue, T

Irifune, T

Yurimoto, H

机构：

[1] Ehime Univ, Geodynam Res Ctr, Dept Earth Sci, Matsuyama, Ehime 7908577, Japan

[2] Tokyo Inst Technol, Tokyo 152, Japan

来源：

GEOPHYSICAL RESEARCH LETTERS | 2001年 / 28卷 / 18期

关键词：

D O I：

10.1029/2001GL013194

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The phase boundary between ringwoodite and perovskite plus periclase in Mg2SiO4 was determined at 1600 degreesC under hydrous conditions with 1 similar to3 wt% H2O. We found that the boundary moved to high-pressure side by similar to0.2 GPa in these hydrous conditions compared with that in anhydrous condition. The SIMS measurements confirmed that the ringwoodite in hydrous condition contained a significant amount (similar to1 wt%) of water, whereas the perovskite accepted only very little (similar to0.05 wt%) water in its crystal structure. The discrepancy between the pressure of 660 kin seismic discontinuity and that of the postspinel transformation reported in a recent in situ x-ray study is not explained by the effect of water on the transformation.

引用

页码：3505 / 3508

页数：4

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