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Science 20 August 1993:
Vol. 261. no. 5124, pp. 1024 - 1026
DOI: 10.1126/science.261.5124.1024
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Articles

Hydrogen in Stishovite, with Implications for Mantle Water Content

Alison R. Pawley 1, Paul F. McMillan 1, and John R. Holloway 2

1 Department of Chemistry, Arizona State University, Tempe, AZ 85287
2 Departments of Chemistry and Geology, Arizona State University, Tempe, AZ 85287

Stishovite, the highest pressure polymorph of silicon dioxide, may be an important mineral in some regions of the Earth's mantle. Fourier transform infrared spectroscopy has been used to determine the hydrogen content of synthetic stishovite. The concentration of hydrogen depends on the aluminum content of the sample and reaches a maximum of 549 ± 23 hydrogen atoms per 106 silicon atoms for an Al2O3 content of 1.51 percent by weight. Stishovite could be a storage site for water in deep subducting slabs and in regions of the mantle that are too hot for hydrous minerals to be stable.

Submitted on March 23, 1993
Accepted on June 22, 1993


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Synchrotron Infrared Absorbance Measurements of Hydrogen in MgSiO3 Perovskite.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)