DOI: 10.1126/science.274.5291.1357. Stability of Perovskite (MgSiO <sub>3</sub> ) in the Earth's Mantle

Stability of Perovskite (MgSiO 3 ) in the Earth's Mantle

10.1126/science.274.5291.1357

Crossref journal-article

American Association for the Advancement of Science (AAAS)

Science (221)

Abstract

Available thermodynamic data and seismic models favor perovskite (MgSiO 3 ) as the stable phase in the mantle. MgSiO 3 was heated at temperatures from 1900 to 3200 kelvin with a Nd-YAG laser in diamond-anvil cells to study the phase relations at pressures from 45 to 100 gigapascals. The quenched products were studied with synchrotron x-ray radiation. The results show that MgSiO 3 broke down to a mixture of MgO (periclase) and SiO 2 (stishovite or an unquenchable polymorph) at pressures from 58 to 85 gigapascals. These results imply that perovskite may not be stable in the lower mantle and that it might be necessary to reconsider the compositional and density models of the mantle.

Bibliography

Saxena, S. K., Dubrovinsky, L. S., Lazor, P., Cerenius, Y., HÃ¤ggkvist, P., Hanfland, M., & Hu, J. (1996). Stability of Perovskite (MgSiO 3 ) in the Earthâs Mantle. Science, 274(5291), 1357â1359.

Authors 7

Surendra K. Saxena (first)
Leonid S. Dubrovinsky (additional)
Peter Lazor (additional)
Yngve Cerenius (additional)
Patrik Häggkvist (additional)
Michael Hanfland (additional)
Jingzhu Hu (additional)

References 14 Referenced 82

Anderson D. L., Theory of the Earth Blackwell Boston 1989 366. / Theory of the Earth by Anderson D. L. (1989)
Saxena S. K., Geochim. Cosmochim. Acta 60, 2379 (1996). (10.1016/0016-7037(96)00096-8) / Geochim. Cosmochim. Acta by Saxena S. K. (1996)
Ito E., Takahashi E., Matsui Y., Earth Planet. Sci Lett. 67, 238 (1984). (10.1016/0012-821X(84)90119-5) / Earth Planet. Sci Lett. by Ito E. (1984)
Meade C., Mao H. K., Hu J., Science 268, 1745 (1995). (10.1126/science.268.5218.1743) / Science by Meade C. (1995)
Shen G., Lazor P., J. Geophys. Res. 100, 17699 (1995). (10.1029/95JB01864) / J. Geophys. Res. by Shen G. (1995)
Boehler R., Phys. Earth Planet. Inter. 96, 181 (1996). (10.1016/0031-9201(96)03150-0) / Phys. Earth Planet. Inter. by Boehler R. (1996)
The diffraction studies were carried out at the NSLS and ESRF using polychromatic synchrotron radiation. The diffraction spectra were collected with a germanium solid-state detector with 2θ angles between 10° and 12° and at energies of 5 to 80 keV.
Lazor P., Saxena S. K. Developments in high-pressure, high-temperature research and the study of the Earth's deep interior, Philos. Trans. Roy. Soc. 354, 1307 (1966). / Philos. Trans. Roy. Soc. / Developments in high-pressure, high-temperature research and the study of the Earth's deep interior by Lazor P. (1966)
Funamori N., Yagi T., Utsumi W., Kondo T., Uchida T., Seki M., J. Geophys. Res. 101, 8257 (1996). (10.1029/95JB03732) / J. Geophys. Res. by Funamori N. (1996)
Anderson O., Equations of State of Solids for Geophysics and Ceramic Science Oxford Univ. Press Oxford 1995 405. (10.1093/oso/9780195056068.001.0001) / Equations of State of Solids for Geophysics and Ceramic Science by Anderson O. (1995)
Kingma K. J., Cohen R. E., Hemley R. J., Mao H. K., Nature 374, 243 (1995). (10.1038/374243a0) / Nature by Kingma K. J. (1995)
Belonoshko A. B., Dubrovinsky L. S., Dubrovinsky N. A., Am. Mineral. 81, 785 (1996). (10.2138/am-1996-3-404) / Am. Mineral. by Belonoshko A. B. (1996)
Tsuchida Y., Yagi T., Nature 340, 217 (1989). (10.1038/340217a0) / Nature by Tsuchida Y. (1989)
We thank D. Hausermann for helping us with the work at the ESRF. Comments by F. Seifert and H. Annersten were helpful. We thank H. Skogby and U. Hålenius Riiksmuseet Stockholm for enstatite samples.The work has been supported financially by grants from the Swedish Natural Science Research Council (NFR) and ESRF.

Dates

Type	When
Created	23 years, 1 month ago (July 27, 2002, 5:45 a.m.)
Deposited	1 year ago (Aug. 7, 2024, 7:30 a.m.)
Indexed	1 year ago (Aug. 7, 2024, 8:40 a.m.)
Issued	28 years, 9 months ago (Nov. 22, 1996)
Published	28 years, 9 months ago (Nov. 22, 1996)
Published Print	28 years, 9 months ago (Nov. 22, 1996)

Funders 0

None

BibTeX

@article{Saxena_1996, title={Stability of Perovskite (MgSiO 3 ) in the Earth’s Mantle}, volume={274}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.274.5291.1357}, DOI={10.1126/science.274.5291.1357}, number={5291}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Saxena, Surendra K. and Dubrovinsky, Leonid S. and Lazor, Peter and Cerenius, Yngve and Häggkvist, Patrik and Hanfland, Michael and Hu, Jingzhu}, year={1996}, month=nov, pages={1357–1359} }

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  "abstract": "<jats:p>\n            Available thermodynamic data and seismic models favor perovskite (MgSiO\n            <jats:sub>3</jats:sub>\n            ) as the stable phase in the mantle. MgSiO\n            <jats:sub>3</jats:sub>\n            was heated at temperatures from 1900 to 3200 kelvin with a Nd-YAG laser in diamond-anvil cells to study the phase relations at pressures from 45 to 100 gigapascals. The quenched products were studied with synchrotron x-ray radiation. The results show that MgSiO\n            <jats:sub>3</jats:sub>\n            broke down to a mixture of MgO (periclase) and SiO\n            <jats:sub>2</jats:sub>\n            (stishovite or an unquenchable polymorph) at pressures from 58 to 85 gigapascals. These results imply that perovskite may not be stable in the lower mantle and that it might be necessary to reconsider the compositional and density models of the mantle.\n          </jats:p>",
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