Strongly Anisotropic Magnesiowüstite in Earth's Lower Mantle
Abstract
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.
- Authors:
-
[1];
[2];
[3];
[2];
- 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)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- National Science Foundation (NSF); Consortium for Materials Properties Research in Earth Sciences (COMPRES); USDOE
- OSTI Identifier:
- 1472128
- Alternate Identifier(s):
- OSTI ID: 1454624
- Grant/Contract Number:
- AC02-06CH11357; DE‐AC02‐06CH11357; DE‐FG02‐94ER14466
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Solid Earth
- Additional Journal Information:
- Journal Volume: 123; Journal Issue: 6; Journal ID: ISSN 2169-9313
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; magnesiowüstite; high pressure; inelastic X‐ray scattering; elasticity; elastic anisotropy; periclase
Citation Formats
Finkelstein, Gregory J., Jackson, Jennifer M., Said, Ayman, Alatas, Ahmet, Leu, Bogdan M., Sturhahn, Wolfgang, and Toellner, Thomas S. Strongly Anisotropic Magnesiowüstite in Earth's Lower Mantle. United States: N. p., 2018.
Web. doi:10.1029/2017JB015349.
Finkelstein, Gregory J., Jackson, Jennifer M., Said, Ayman, Alatas, Ahmet, Leu, Bogdan M., Sturhahn, Wolfgang, & Toellner, Thomas S. Strongly Anisotropic Magnesiowüstite in Earth's Lower Mantle. United States. https://doi.org/10.1029/2017JB015349
Finkelstein, Gregory J., Jackson, Jennifer M., Said, Ayman, Alatas, Ahmet, Leu, Bogdan M., Sturhahn, Wolfgang, and Toellner, Thomas S. Fri .
"Strongly Anisotropic Magnesiowüstite in Earth's Lower Mantle". United States. https://doi.org/10.1029/2017JB015349. https://www.osti.gov/servlets/purl/1472128.
@article{osti_1472128,
title = {Strongly Anisotropic Magnesiowüstite in Earth's Lower Mantle},
author = {Finkelstein, Gregory J. and Jackson, Jennifer M. and Said, Ayman and Alatas, Ahmet and Leu, Bogdan M. and Sturhahn, Wolfgang and Toellner, Thomas S.},
abstractNote = {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.},
doi = {10.1029/2017JB015349},
journal = {Journal of Geophysical Research. Solid Earth},
number = 6,
volume = 123,
place = {United States},
year = {Fri May 18 00:00:00 EDT 2018},
month = {Fri May 18 00:00:00 EDT 2018}
}
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Cited by: 18 works
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Figures / Tables:
Figure 1: (left) Time-domain synchrotron Mössbauer spectra of magnesiowüstite as a function of pressure. At 64 GPa, the appearance of high-frequency oscillations in the spectrum indicates a magnetic-ordering transition. (top right) Count rates determined for the time window 23 to 129 ns. (bottom right) Percent proportion of the slow componentmore »
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Works referencing / citing this record:
Lowermost Mantle Anisotropy Beneath Africa From Differential SKS ‐ SKKS Shear‐Wave Splitting
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