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Title: The influence of δ-(Al,Fe)OOH on seismic heterogeneities in Earth’s lower mantle

Abstract

The high-pressure phases of oxyhydroxides (δ-AlOOH, ε-FeOOH, and their solid solution), candidate components of subducted slabs, have wide stability fields, thus potentially influencing volatile circulation and dynamics in the Earth’s lower mantle. Here, we report the elastic wave velocities of δ-(Al,Fe)OOH (Fe/(Al + Fe) = 0.13, δ-Fe13) to 79 GPa, determined by nuclear resonant inelastic X-ray scattering. At pressures below 20 GPa, a softening of the phonon spectra is observed. With increasing pressure up to the Fe3+ spin crossover (~ 45 GPa), the Debye sound velocity (vD) increases. At higher pressures, the low spin δ-Fe13 is characterized by a pressure-invariant vD. Using the equation of state for the same sample, the shear-, compressional-, and bulk-velocities (vS, vP, and vΦ) are calculated and extrapolated to deep mantle conditions. The obtained velocity data show that δ-(Al,Fe)OOH may cause low-vΦ and low-vP anomalies in the shallow lower mantle. At deeper depths, we find that this hydrous phase reproduces the anti-correlation between vS and vΦ reported for the large low seismic velocity provinces, thus serving as a potential seismic signature of hydrous circulation in the lower mantle.

Authors:
 [1];  [2];  [2];  [2];  [3];  [4];  [1];  [1]
  1. Tohoku Univ., Sendai (Japan)
  2. California Institute of Technology (CalTech), Pasadena, CA (United States)
  3. Hiroshima Univ. (Japan)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); German Science Foundation; National Science Foundation (NSF)
OSTI Identifier:
1813316
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 11; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Ohira, Itaru, Jackson, Jennifer M., Sturhahn, Wolfgang, Finkelstein, Gregory J., Kawazoe, Takaaki, Toellner, Thomas S., Suzuki, Akio, and Ohtani, Eiji. The influence of δ-(Al,Fe)OOH on seismic heterogeneities in Earth’s lower mantle. United States: N. p., 2021. Web. doi:10.1038/s41598-021-91180-9.
Ohira, Itaru, Jackson, Jennifer M., Sturhahn, Wolfgang, Finkelstein, Gregory J., Kawazoe, Takaaki, Toellner, Thomas S., Suzuki, Akio, & Ohtani, Eiji. The influence of δ-(Al,Fe)OOH on seismic heterogeneities in Earth’s lower mantle. United States. https://doi.org/10.1038/s41598-021-91180-9
Ohira, Itaru, Jackson, Jennifer M., Sturhahn, Wolfgang, Finkelstein, Gregory J., Kawazoe, Takaaki, Toellner, Thomas S., Suzuki, Akio, and Ohtani, Eiji. Tue . "The influence of δ-(Al,Fe)OOH on seismic heterogeneities in Earth’s lower mantle". United States. https://doi.org/10.1038/s41598-021-91180-9. https://www.osti.gov/servlets/purl/1813316.
@article{osti_1813316,
title = {The influence of δ-(Al,Fe)OOH on seismic heterogeneities in Earth’s lower mantle},
author = {Ohira, Itaru and Jackson, Jennifer M. and Sturhahn, Wolfgang and Finkelstein, Gregory J. and Kawazoe, Takaaki and Toellner, Thomas S. and Suzuki, Akio and Ohtani, Eiji},
abstractNote = {The high-pressure phases of oxyhydroxides (δ-AlOOH, ε-FeOOH, and their solid solution), candidate components of subducted slabs, have wide stability fields, thus potentially influencing volatile circulation and dynamics in the Earth’s lower mantle. Here, we report the elastic wave velocities of δ-(Al,Fe)OOH (Fe/(Al + Fe) = 0.13, δ-Fe13) to 79 GPa, determined by nuclear resonant inelastic X-ray scattering. At pressures below 20 GPa, a softening of the phonon spectra is observed. With increasing pressure up to the Fe3+ spin crossover (~ 45 GPa), the Debye sound velocity (vD) increases. At higher pressures, the low spin δ-Fe13 is characterized by a pressure-invariant vD. Using the equation of state for the same sample, the shear-, compressional-, and bulk-velocities (vS, vP, and vΦ) are calculated and extrapolated to deep mantle conditions. The obtained velocity data show that δ-(Al,Fe)OOH may cause low-vΦ and low-vP anomalies in the shallow lower mantle. At deeper depths, we find that this hydrous phase reproduces the anti-correlation between vS and vΦ reported for the large low seismic velocity provinces, thus serving as a potential seismic signature of hydrous circulation in the lower mantle.},
doi = {10.1038/s41598-021-91180-9},
journal = {Scientific Reports},
number = 1,
volume = 11,
place = {United States},
year = {Tue Jun 08 00:00:00 EDT 2021},
month = {Tue Jun 08 00:00:00 EDT 2021}
}

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