Other
Scientific paper
Aug 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3715304w&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 15, CiteID L15304
Other
6
Mineral Physics: Elasticity And Anelasticity, Mineral Physics: High-Pressure Behavior, Mineral Physics: Nmr, Mossbauer Spectroscopy, And Other Magnetic Techniques
Scientific paper
The sound velocities of (Mg.16Fe.84)O have been measured to 121 GPa at ambient temperature using nuclear resonant inelastic x-ray scattering. The effect of electronic environment of the iron sites on the sound velocities were tracked in situ using synchrotron Mössbauer spectroscopy. We found the sound velocities of (Mg.16Fe.84)O to be much lower than those in other presumed mantle phases at similar conditions, most notably at very high pressures. Conservative estimates of the effect of temperature and dilution on aggregate sound velocities show that only a small amount of iron-rich (Mg,Fe)O can greatly reduce the average sound velocity of an assemblage. We propose that iron-rich (Mg,Fe)O be a source of ultra-low velocity zones. Other properties of this phase, such as enhanced density and dynamic stability, strongly support the presence of iron-rich (Mg,Fe)O in localized patches above the core-mantle boundary.
Jackson James M.
Sturhahn Wolfgang
Wicks June K.
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