Strongly Anisotropic Magnesiowüstite in Earth's Lower Mantle

Finkelstein, Gregory J.; Jackson, Jennifer M.; Said, Ayman; Alatas, Ahmet; Leu, Bogdan M.; Sturhahn, Wolfgang; Toellner, Thomas S.

doi:10.1029/2017JB015349

Title: Strongly Anisotropic Magnesiowüstite in Earth's Lower Mantle

Journal Article · Fri May 18 00:00:00 EDT 2018 · Journal of Geophysical Research. Solid Earth

DOI:https://doi.org/10.1029/2017JB015349· OSTI ID:1472128

^[1];

^[2]; Said, Ayman ^[3];

^[3]; Leu, Bogdan M. ^[4];

^[2]; Toellner, Thomas S. ^[3]

California Inst. of Technology (CalTech), Pasadena, CA (United States); Univ. of Hawai'i at Manoa, Honolulu, HI (United States)
California Inst. of Technology (CalTech), Pasadena, CA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Miami Univ., Oxford, OH (United States)

Abstract The juxtaposition of a liquid iron‐dominant alloy against a mixture of silicate and oxide minerals at Earth's core‐mantle boundary is associated with a wide range of complex seismological features. One category of observed structures is ultralow‐velocity zones, which are thought to correspond to either aggregates of partially molten material or solid, iron‐enriched assemblages. We measured the phonon dispersion relations of (Mg,Fe) O magnesiowüstite containing 76 mol % FeO, a candidate ultralow‐velocity zone phase, at high pressures using high‐energy resolution inelastic X‐ray scattering. From these measurements, we find that magnesiowüstite becomes strongly elastically anisotropic with increasing pressure, potentially contributing to a significant proportion of seismic anisotropy detected near the base of the mantle.

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

Sponsoring Organization:: National Science Foundation (NSF); Consortium for Materials Properties Research in Earth Sciences (COMPRES); USDOE

Grant/Contract Number:: AC02-06CH11357; DE‐AC02‐06CH11357; DE‐FG02‐94ER14466

OSTI ID:: 1472128

Alternate ID(s):: OSTI ID: 1454624

Journal Information:: Journal of Geophysical Research. Solid Earth, Vol. 123, Issue 6; ISSN 2169-9313

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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