Equation of state of Al-bearing perovskite to lower mantle pressure conditions

Details Equation of state of Al-bearing perovskite to lower mantle pressure conditions Equation of state of Al-bearing perovskite to lower mantle pressure conditions

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3789d&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 19, p. 3789-3792

Physics

17

Mineralogy And Petrology: Crystal Chemistry, Mineral Physics: Equations Of State, Mineral Physics: High-Pressure Behavior, Tectonophysics: Earth'S Interior-Composition And State

Scientific paper

Al2O3 is estimated to total 4 to 5 mol% in all mantle compositional models, and is believed to be incorporated into (Mg,Fe)SiO3-perovskite at lower mantle conditions. Using synchrotron X-ray diffraction, we have measured the 300 K equation of state of a perovskite with XAl=Al/(Al+Mg+Si)=0.077, up to 32 GPa. A least squares refinement of two independent data sets yields the following equation of state parameters V0=163.52(3)Å3, K0=229(4)GPa, and K0=2.5(4). These values allow us to assess the most probable substitution mechanism for aluminum into perovskite at pressure conditions of the shallow lower mantle. Al3+ is likely to be incorporated in place of Si4+ in the octahedral site of perovskite, hence requiring the creation of oxygen vacancies for charge balance. As a consequence, aluminous perovskites may have a high affinity for water. The enhanced compressibility of aluminous perovskite certainly has also strong geophysical and geochemical implications, as it may revive perovskite-rich lower mantle models.

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