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

Wicks, June K. and Jackson, Jennifer M. and Sturhahn, Wolfgang and Zhang, Dongzhou (2017) Sound velocity and density of magnesiowüstites: Implications for ultralow-velocity zone topography. Geophysical Research Letters, 44 (5). pp. 2148-2158. ISSN 0094-8276. doi:10.1002/2016GL071225.

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We explore the effect of Mg/Fe substitution on the sound velocities of iron-rich (Mg_(1 – x)Fe_x)O, where x = 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.

Item Type:Article
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URLURL TypeDescription
Jackson, Jennifer M.0000-0002-8256-6336
Sturhahn, Wolfgang0000-0002-9606-4740
Zhang, Dongzhou0000-0002-6679-892X
Additional Information:© 2017 American Geophysical Union. Received 15 SEP 2016; Accepted 31 JAN 2017; Accepted article online 2 FEB 2017; Published online 4 MAR 2017. We thank D.J. Bower and D.V. Helmberger for fruitful discussions. We thank E.E. Alp, T.S. Toellner, and J. Zhao for their assistance at Sector 3; V. Prakapenka at GSECARS; and J. Knight at the ALS. We are thankful to NSF-EAR-CAREER-0956166, NSF-CSEDI-EAR-1161046 for support of this research and to two anonymous reviewers for their thoughtful suggestions. Operations at Sector 3 (APS) and beamline 12.2.2 (ALS) are partially supported by COMPRES. FeO X-ray diffraction measurements were conducted at GSECARS (Sector 13, APS), supported by NSF EAR-1128799 and U.S. DOE, Geosciences (DE-FG02-94ER14466). Use of the APS is supported by the U.S. DOE, Office of Science (DE-AC02-06CH11357) and ALS by the U.S. DOE, Office of Science (DE-AC02-05CH11231). Original data corresponding to those shown in figures and tables are available upon request from the authors.
Group:Seismological Laboratory
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-94ER14466
Department of Energy (DOE)DE-AC02-06CH11357
Department of Energy (DOE)DE-AC02-05CH11231
Subject Keywords:lower mantle
Issue or Number:5
Record Number:CaltechAUTHORS:20170217-131316177
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Official Citation:Wicks, J. K., J. M. Jackson, W. Sturhahn, and D. Zhang (2017), Sound velocity and density of magnesiowüstites: Implications for ultralow-velocity zone topography, Geophys. Res. Lett., 44, 2148–2158, doi:10.1002/2016GL071225
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74404
Deposited By: Tony Diaz
Deposited On:24 Feb 2017 17:54
Last Modified:11 Nov 2021 05:26

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