Sound velocity and density of magnesiowüstites: Implications for ultralow‐velocity zone topography

June K. Wicks, Jennifer M. Jackson, Wolfgang Sturhahn, Dongzhou Zhang

doi:10.1002/2016gl071225

Sound velocity and density of magnesiowüstites: Implications for ultralow‐velocity zone topography

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June K. Wicks

Division of Geological and Planetary Sciences California Institute of Technology Pasadena California USA
Jennifer M. Jackson

Division of Geological and Planetary Sciences California Institute of Technology Pasadena California USA
Wolfgang Sturhahn

Division of Geological and Planetary Sciences California Institute of Technology Pasadena California USA
Dongzhou Zhang

Division of Geological and Planetary Sciences California Institute of Technology Pasadena California USA

書誌事項

公開日: 2017-03-04

権利情報

http://onlinelibrary.wiley.com/termsAndConditions#vor

DOI

10.1002/2016gl071225

公開者: American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>We explore the effect of Mg/Fe substitution on the sound velocities of iron‐rich (Mg<jats:sub>1 − <jats:italic>x</jats:italic></jats:sub>Fe<jats:sub><jats:italic>x</jats:italic></jats:sub>)O, where <jats:italic>x</jats:italic> = 0.84, 0.94, and 1.0. Sound velocities were determined using nuclear resonance inelastic X‐ray scattering as a function of pressure, approaching those of the lowermost mantle. The systematics of cation substitution in the Fe‐rich limit has the potential to play an important role in the interpretation of seismic observations of the core‐mantle boundary. By determining a relationship between sound velocity, density, and composition of (Mg,Fe)O, this study explores the potential constraints on ultralow‐velocity zones at the core‐mantle boundary.</jats:p>