Effect of chemistry on the stability and elasticity of the perovskite and post-perovskite phases in the MgSiO3-FeSiO3- Al2O3 system and implications for the lowermost mantle

Geophysical Research Letters

Volumn 32, Issue 16, 2005, Pages 1-4

  Caracas, R ^a   Cohen, R E ^a  

^a GEOPHYSICAL LABORATORY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ALUMINA; ANISOTROPY; DENSITY (SPECIFIC GRAVITY); ELASTICITY; EQUATIONS OF STATE OF SOLIDS; EXPERIMENTAL MINERALOGY; GEOCHEMISTRY; PEROVSKITE; PHASE COMPOSITION; PHASE TRANSITIONS; SEISMIC WAVES; SILICATE MINERALS;

IRON SILICATES; LOWERMOST MANTLE; MAGNESIUM SILICATES; SEISMIC WAVE VELOCITIES;

STRUCTURAL GEOLOGY;

CHEMICAL COMPOSITION; LOWER MANTLE; MANTLE CHEMISTRY; PEROVSKITE;

EID: 26844523124     PISSN: 00948276     EISSN: None     Source Type: Journal    
DOI: 10.1029/2005GL023164     Document Type: Article

References (34)

1. Anisimov, V. I., F. Aryasetiawan, and A. I. Lichtenstein (1997), First-principles calculations of the electronic structure and spectra of strongly correlated systems: The LDA+U method, J. Phys. Condens. Matter, 9, 767-808.
2. 3 at high pressures, Geophys. Res. Lett., 32, L06303, doi:10.1029/2004GL022204.
3. Caracas, R., and R. Wentzcovitch (2004), Equation of state and elasticity of FeSi, Geophys. Res. Lett., 31, L20603, doi:10.1029/ 2004GL020601.
4. Cohen, R. E., I. Mazin, and D. G. Isaak (1997), Magnetic collapse in transition metal oxides at high pressures: Implications for the Earth, Science, 275, 654-657.
5. Garnero, E. (2004), A new paradigm for Earth's core-mantle boundary, Science, 304, 8834-8836.
6. Goarant, F., F. Guyot, J. Peyronneau, and J. P. Poirier (1992), High-pressure and high-temperature reactions between silicates and liquid iron alloys, in the diamond anvil cell, studied by analytical electron microscopy, J. Geophys. Res., 97, 4477-4487.
7. Gonze, X., et al. (2002), First-principles computation of material properties: The ABINIT software project, Comput. Mater. Sci., 25, 478-492.
8. Gramsch, S. A., R. E. Cohen, and S. Y. Savrasov (2003), Structure, metal-insulator transitions, and magnetic properties of FeO at high pressures, Am. Mineral., 88, 257-261.
9. Hill, R. (1963), Elastic properties of reinforced solids: Some theoretical principles, J. Mech. Phys. Solids, 11, 357-372.
10. Hohenberg, P., and W. Kohn (1964), Inhomogeneous electron gas, Phys. Rev., 136, B864-B3871.
11. 3 post-perovskite phase in the Earth's lowermost mantle, Nature, 430, 442-445.
12. Kesson, S. E., J. D. Fitz Gerald, and J. M. Shelley (1998), Mineralogy and dynamics of a pyrolite mantle, Nature, 393, 252-255.
13. Knittle, E., and R. Jeanloz (1989), Simulating the core-mantle boundary: An experimental study of high-pressure reactions between silicates and liquid iron, Geophys. Res. Lett., 16, 609-612.
14. Knittle, E., and R. Jeanloz (1991), Earth's core-mantle boundary: Results of experiments at high pressures and temperatures, Science, 251, 1438-1443.
15. Kohn, W., and L. J. Sham (1965), Self-consistent equations including exchange and correlation effects, Phys. Rev., 140, A1133-A1138.
16. Lay, T., and D. V. Helmberger (1983), A shear velocity discontinuity in the lower mantle, Geophys. Res. Lett., 10, 63-66.
17. Lay, T., D. Heinz, M. Ishii, S.-H. Shim, J. Tsuchiya, T. Tsuchiya, R. Wentzcovitch, and D. Yuen (2005), Multidisciplinary impact of the deep mantle phase transition in perovskite structure, Eos Trans. AGU, 86(1), 1, 5.
18. 3 perovskite under pressure, Geophys. Res. Lett., 32, L04304, doi:10.1029/2004GL022068.
19. Mao, W. L., G. Shen, V. B. Prakapenka, Y. Meng, A. J. Cambell, D. L. Heinz, J. Shu, R. J. Hemley, and H.-K. Mao (2004), Ferromagnesian postperovskite silicates in the D″ layer, Proc. Natl. Acad. Sci. U.S.A., 101, 15,867-15,869.
20. Mao, W. L., et al. (2005), Iron-rich silicates in the Earth's D″ layer, Proc. Natl. Acad. Sci. U.S.A., 102, 9751-9753.
21. Monkhorst, H. J., and J. D. Pack (1976), Special points for Brillouin-zone integrations, Phys. Rev. B, 13, 5188-5192.
22. 3, Science, 304, 855-858.
23. Murakami, M., K. Hirose, N. Sata, and Y. Ohishi (2005), Post-perovskite phase transition and mineral chemistry in the pyrolitic lowermost mantle, Geophys. Res. Lett., 32, L03304, doi:10.1029/2004GL021956.
24. Nakagawa, T., and P. J. Tackley (2004), Effects of a perovskite-post perovskite phase change near core-mantle boundary in compressible mantle convection, Geophys. Res. Lett., 31, L16611, doi:10.1029/2004GL020648.
25. 3 in the Earth's D″ layer, Nature, 430, 44-448.
26. Perdew, J. P., K. Burke, and M. Ernzerhof (1996), Generalized gradient approximation made simple, Phys. Rev. Lett., 77, 3865-3868.
27. Revenaugh, J., and R. Meyer (1997), Seismic evidence of partial melt within a possibly ubiquitous low-velocity layer at the base of the mantle, Science, 277, 670-673.
28. 3 perovskite to the core-mantle boundary, Geophys. Res. Lett., 31, L10603, doi:10.1029/2004GL019639.
29. Sidorin, I., M. Gurnis, and D. V. Helmberger (1999a), Evidence of a ubiquitous seismic discontinuity at the base of the mantle, Science, 286, 1326-1331.
30. Sidorin, I., M. Gurnis, and D. V. Helmberger (1999b), Dynamics of a phase change at the base of the mantle consistent with seismological observations, J. Geophys. Res., 104, 15,005-15,023.
31. 3 perovskite in the Earth's lower mantle, Earth Planet. Sci. Lett., 224, 241-248.
32. 3, Geophys. Res. Lett., 31, L14603, doi:10.1029/2004GL020278.
33. 3 postperovskite, J. Geophys. Res., 110, B02204, doi:10.1029/2004JB003409.
34. Wen, L., and D. V. Helmberger (1998), Ultra-low velocity zones near the core-mantle boundary from broadband PKP precursors, Science, 279, 1701-1703.