Evaluating the Role of Iron-Rich (Mg,Fe)O in Ultralow Velocity Zones

Dobrosavljevic, Vasilije V.; Sturhahn, Wolfgang; Jackson, Jennifer M.

doi:10.3390/min9120762

Title: Evaluating the Role of Iron-Rich (Mg,Fe)O in Ultralow Velocity Zones

Journal Article · Sun Dec 08 00:00:00 EST 2019 · Minerals

DOI:https://doi.org/10.3390/min9120762· OSTI ID:1596133

^[1]; Sturhahn, Wolfgang ^[1]; Jackson, Jennifer M. ^[1]

California Institute of Technology (CalTech), Pasadena, CA (United States)

The composition of ultralow velocity zones (ULVZs) remains an open question, despite advances in both seismology and experimental work. We investigate the hypothesis of iron-rich (Mg,Fe)O (magnesiowüstite) as a cause of ULVZ seismic signatures. We report new quasi-hydrostatic X-ray diffraction measurements to constrain the equation of state of (Mg_0.06Fe_0.94)O with fit parameters V₀ = 9.860 ± 0.007 Å³, K_0T = 155.3 ± 2.2 GPa, K’_0T = 3.79 ± 0.11, as well as synchrotron Mössbauer spectroscopy measurements to characterize the high-pressure magnetic and spin state of magnesiowüstite. We combine these results with information from previous studies to calculate the elastic behavior at core–mantle boundary conditions of magnesiowüstite, as well as coexisting bridgmanite and calcium silicate perovskite. Forward models of aggregate elastic properties are computed, and from these, we construct an inverse model to determine the proportions of magnesiowüstite that best reproduce ULVZ observations within estimated mutual uncertainties. We find that the presence of magnesiowüstite can explain ULVZ observations exhibiting 1:2 VP:VS reduction ratios relative to the Preliminary Reference Earth Model (PREM), as well as certain 1:3 VP:VS reductions within estimated uncertainty bounds. Our work quantifies the viability of compositionally distinct ULVZs containing magnesiowüstite and contributes to developing a framework for a methodical approach to evaluating ULVZ hypotheses.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: AC02-06CH11357; AC02-05CH11231; NSF-CSEDI-EAR-1161046; NSF-EAR-CAREER-0956166

OSTI ID:: 1596133

Journal Information:: Minerals, Vol. 9, Issue 12; ISSN 2075-163X

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 8 works

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58 GEOSCIENCES
(Mg
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ultralow velocity zones
core–mantle boundary
equations of state
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Title: Evaluating the Role of Iron-Rich (Mg,Fe)O in Ultralow Velocity Zones

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