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

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

doi:10.1002/2016GL071225

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

Journal Article · Fri Mar 03 23:00:00 EST 2017 · Geophysical Research Letters

DOI:https://doi.org/10.1002/2016GL071225· OSTI ID:1355031

^[1]; Jackson, Jennifer M. ^[2]; ^[2]; ^[3]

California Inst. of Technology (CalTech), Pasadena, CA (United States); Princeton Univ., NJ (United States)
California Inst. of Technology (CalTech), Pasadena, CA (United States)
California Inst. of Technology (CalTech), Pasadena, CA (United States); Univ. of Hawai'i at Manoa Honolulu, HI (United States). Hawai'i Inst. of Geophysics and Planetology

Herein 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.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: FG02-94ER14466; AC02-06CH11357; AC02-05CH11231

OSTI ID:: 1355031

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 5 Vol. 44; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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