Published July 30, 2004
| Version Published
Journal Article
Open
Shock-induced melting of MgSiO_3 perovskite and implications for melts in Earth's lowermost mantle
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1.
California Institute of Technology
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2.
Los Alamos National Laboratory
Abstract
New shock wave equation of state (EOS) data for enstatite and MgSiO_3 glass constrain the density change upon melting of Mg-silicate perovskite up to 200 GPa. The melt becomes denser than perovskite near the base of Earth's lower mantle. This inference is confirmed by shock temperature data suggesting a negative pressure-temperature slope along the melting curve at high pressure. Although melting of Earth's mantle involves multiple phases and chemical components, this implies that the partial melts invoked to explain anomalous seismic velocities in the lowermost mantle may be dynamically stable.
Additional Information
© 2004 American Geophysical Union. Received 12 April 2004; accepted 2 July 2004; published 30 July 2004. This work was funded by the National Science Foundation through grants EAR-9903806 and EAR-0207934. Thanks to Carl Francis and Stephen Mackwell for providing the high quality Sri Lankan enstatites used in this study. The authors thank an anonymous reviewer and editor Kristine Larson for their help improving the manuscript. This is Caltech GPS contribution #9046.Attached Files
Published - 2004GL020237.pdf
Files
2004GL020237.pdf
Additional details
Identifiers
- Eprint ID
- 33797
- Resolver ID
- CaltechAUTHORS:20120831-143626223
Funding
- NSF
- EAR-9903806
- NSF
- EAR-0207934
Dates
- Created
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2012-09-04Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field
Caltech Custom Metadata
- Caltech groups
- Division of Geological and Planetary Sciences (GPS)
- Other Numbering System Name
- Caltech Division of Geological and Planetary Sciences
- Other Numbering System Identifier
- 9046