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Direct shock wave loading of Stishovite to 235 GPa: Implications for perovskite stability relative to an oxide assemblage at lower mantle conditions

Luo, Sheng-Nian and Mosenfelder, J. L. and Asimow, Paul D. and Ahrens, Thomas J. (2002) Direct shock wave loading of Stishovite to 235 GPa: Implications for perovskite stability relative to an oxide assemblage at lower mantle conditions. Geophysical Research Letters, 29 (14). Art. No. 1691. ISSN 0094-8276. doi:10.1029/2002GL015627. https://resolver.caltech.edu/CaltechAUTHORS:20120905-135949010

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Abstract

Pure stishovite and coesite samples with zero porosity and dimensions appropriate for planar shock wave experiments have been synthesized with multi-anvil high-pressure techniques. The equation of state of stishovite is obtained by direct shock wave loading up to 235 GPa: K_(0T) = 306 ± 5 GPa and K'_(0T) = 5.0 ± 0.2 where K_(0T) and K'_(0T) are ambient bulk modulus and its pressure derivative, respectively. The Hugoniots (shock equations of state) for stishovite, coesite and quartz achieve widely differing internal energy states at equal volume and therefore allow us to determine the Gruneisen parameter of stishovite. On the basis of the resulting P-V-T equation of state for stishovite and previous studies on other phases on the MgO-SiO_2 binary, the breakdown reaction of MgSiO_3-perovskite to MgO and SiO_2 was calculated. Our calculations show that perovskite is thermodynamically stable relative to the stishovite and periclase assemblage at lower mantle conditions. We obtain similar results for a range of models, despite the appreciable differences among these experiment-based thermodynamic parameters.


Item Type:Article
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http://dx.doi.org/10.1029/2002GL015627DOIUNSPECIFIED
http://www.agu.org/pubs/crossref/2002/2002GL015627.shtmlPublisherUNSPECIFIED
ORCID:
AuthorORCID
Asimow, Paul D.0000-0001-6025-8925
Additional Information:© 2002 American Geophysical Union. Received 7 June 2002; accepted 21 June 2002; published 25 July 2002. This work was supported by NSF grant EAR-9506377. We thank W. Panero and D. Andrault for kindly sharing their preprints with us, M. Long, P. Gelle and C. McCaughey for technical support and the reviewers for comments. Contribution No. 8865, Division of Geological and Planetary Sciences, California Institute of Technology.
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Funding AgencyGrant Number
NSFEAR-9506377
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences8865
Issue or Number:14
DOI:10.1029/2002GL015627
Record Number:CaltechAUTHORS:20120905-135949010
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120905-135949010
Official Citation: Luo, S.-N., J. L. Mosenfelder, P. D. Asimow, and T. J. Ahrens (2002), Direct shock wave loading of Stishovite to 235 GPa: Implications for perovskite stability relative to an oxide assemblage at lower mantle conditions, Geophys. Res. Lett., 29(14), 1691, doi:10.1029/2002GL015627.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33872
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:05 Sep 2012 21:19
Last Modified:09 Nov 2021 23:05

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