Cationic substitution in MgSiO3 perovskite

Details Cationic substitution in MgSiO3 perovskite Cationic substitution in MgSiO3 perovskite

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pepi..136...67a&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 136, Issue 1-2, p. 67-78.

Physics

5

Scientific paper

Various MgSiO3-based compositions were used to investigate the possible cationic substitutions in Earth's lower mantle perovskite at about 25GPa and 1750K, using a multi-anvil press apparatus. Recovered samples were characterized using X-ray diffraction and electron microprobe. Inserted in the silicate perovskite structure were found (i) high levels of [FeAl], [ScAl], [GaAl], and [YAl], (ii) Na amounts up to 0.9% per formula units, and (iii) various other elements such as Li, N, P, V, and Cr. Strong correlation between contents of pair-substituted cations suggest a major amount of coupled-substitution in the perovskite lattice. The cell parameter ratios a/c and b/c are found to increase with increasing size of the substituted trivalent cation. At an upper limit, a tetragonal lattice (P4/mcc) is observed for a silicate perovskite with [YAl]0.25(MgSi)0.75O3 composition. Using a schematic pyrolitic composition for the lower mantle, the possible integration of all types of cations in Mg- and Ca-bearing silicate perovskite phases is discussed.

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