High-pressure sound velocities and elasticity of aluminous MgSiO3 perovskite to 45 GPa: Implications for lateral heterogeneity in Earth's lower mantle

Jennifer M. Jackson, Jianzhong Zhang, Jinfu Shu, Stanislav V. Sinogeikin, Jay D. Bass

Research output: Contribution to journalArticlepeer-review

Abstract

Brillouin scattering measurements on aluminous magnesium silicate perovskite, arguably the most abundant phase in Earth, have been performed to 45 GPa in a diamond anvil cell at room temperature, using methanol-ethanol-water and neon as pressure transmitting media. The experiments were performed on a polycrystalline sample of aluminous MgSiO3 perovskite containing 5.1 ± 0.2 wt.% Al2O3. The pressure derivatives of the adiabatic bulk (Kos) and shear (μos) moduli are 3.7 ± 0.3 and 1.7 ± 0.2, respectively. These measurements allow us to evaluate whether the observed lateral variations of seismic wave speeds in Earth's lower mantle are due at least in part to a chemical origin. Our results indicate that a difference in the aluminum content of silicate perovskite, reflecting a variation in overall chemistry, is a plausible candidate for such seismic heterogeneity.

Original languageEnglish (US)
Article numberL21305
Pages (from-to)1-4
Number of pages4
JournalGeophysical Research Letters
Volume32
Issue number21
DOIs
StatePublished - Nov 16 2005

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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