Iron-Rich Post-Perovskite and the Origin of Ultralow-Velocity Zones

Details Iron-Rich Post-Perovskite and the Origin of Ultralow-Velocity Zones Iron-Rich Post-Perovskite and the Origin of Ultralow-Velocity Zones

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sci...312..564m&link_type=abstract

Science, Volume 312, Issue 5773, pp. 564-565 (2006).

Computer Science

41

Scientific paper

The boundary layer between the crystalline silicate lower mantle and the liquid iron core contains regions with ultralow seismic velocities. Such low compressional and shear wave velocities and high Poisson's ratio are also observed experimentally in post-perovskite silicate phase containing up to 40 mol% FeSiO3 endmember. The iron-rich post-perovskite silicate is stable at the pressure-temperature and chemical environment of the core-mantle boundary and can be formed by core-mantle reaction. Mantle dynamics may lead to further accumulation of this material into the ultralow-velocity patches that are observable by seismology.

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