Effect of water on the spinel-postspinel transformation in Mg2SiO4

Details Effect of water on the spinel-postspinel transformation in Mg2SiO4 Effect of water on the spinel-postspinel transformation in Mg2SiO4

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3505h&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 18, p. 3505-3508

Physics

22

Geodesy And Gravity: Earth'S Interior-Composition And State, Mineral Physics: High-Pressure Behavior, Tectonophysics: Earth'S Interior-Composition And State

Scientific paper

The phase boundary between ringwoodite and perovskite plus periclase in Mg2SiO4 was determined at 1600°C under hydrous conditions with 1~3wt%H2O. We found that the boundary moved to high-pressure side by ~0.2 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 (~1 wt%) of water, whereas the perovskite accepted only very little (~0.05 wt%) water in its crystal structure. The discrepancy between the pressure of 660 km 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.

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