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Shock-induced melting of MgSiO_3 perovskite and implications for melts in Earth's lowermost mantle

Akins, Joseph A. and Luo, Sheng-Nian and Ahrens, Thomas J. and Asimow, Paul D. (2004) Shock-induced melting of MgSiO_3 perovskite and implications for melts in Earth's lowermost mantle. Geophysical Research Letters, 31 (14). Art. No. L14612. ISSN 0094-8276. doi:10.1029/2004GL020237.

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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.

Item Type:Article
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Asimow, Paul D.0000-0001-6025-8925
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.
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Subject Keywords:Mineral Physics: Equations of state; Mineral Physics: Shock wave experiments; Tectonophysics: Earth's interior—composition and state
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Caltech Division of Geological and Planetary Sciences9046
Issue or Number:14
Record Number:CaltechAUTHORS:20120831-143626223
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Official Citation:Akins, J. A., S.-N. Luo, P. D. Asimow, and T. J. Ahrens (2004), Shock-induced melting of MgSiO3 perovskite and implications for melts in Earth's lowermost mantle, Geophys. Res. Lett., 31, L14612, doi:10.1029/2004GL020237.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33797
Deposited On:04 Sep 2012 15:46
Last Modified:09 Nov 2021 23:04

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