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 velocitie...
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Nature Portfolio
2021
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oai:doaj.org-article:14721f6976be4b5089995685175aa5d52021-12-02T17:52:33ZThe influence of δ-(Al,Fe)OOH on seismic heterogeneities in Earth’s lower mantle10.1038/s41598-021-91180-92045-2322https://doaj.org/article/14721f6976be4b5089995685175aa5d52021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-91180-9https://doaj.org/toc/2045-2322Abstract 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 (v D) increases. At higher pressures, the low spin δ-Fe13 is characterized by a pressure-invariant v D. Using the equation of state for the same sample, the shear-, compressional-, and bulk-velocities (v S, v P, and v Φ) are calculated and extrapolated to deep mantle conditions. The obtained velocity data show that δ-(Al,Fe)OOH may cause low-v Φ and low-v P anomalies in the shallow lower mantle. At deeper depths, we find that this hydrous phase reproduces the anti-correlation between v S and v Φ reported for the large low seismic velocity provinces, thus serving as a potential seismic signature of hydrous circulation in the lower mantle.Itaru OhiraJennifer M. JacksonWolfgang SturhahnGregory J. FinkelsteinTakaaki KawazoeThomas S. ToellnerAkio SuzukiEiji OhtaniNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021) |
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Medicine R Science Q Itaru Ohira Jennifer M. Jackson Wolfgang Sturhahn Gregory J. Finkelstein Takaaki Kawazoe Thomas S. Toellner Akio Suzuki Eiji Ohtani The influence of δ-(Al,Fe)OOH on seismic heterogeneities in Earth’s lower mantle |
| description |
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 (v D) increases. At higher pressures, the low spin δ-Fe13 is characterized by a pressure-invariant v D. Using the equation of state for the same sample, the shear-, compressional-, and bulk-velocities (v S, v P, and v Φ) are calculated and extrapolated to deep mantle conditions. The obtained velocity data show that δ-(Al,Fe)OOH may cause low-v Φ and low-v P anomalies in the shallow lower mantle. At deeper depths, we find that this hydrous phase reproduces the anti-correlation between v S and v Φ reported for the large low seismic velocity provinces, thus serving as a potential seismic signature of hydrous circulation in the lower mantle. |
| format |
article |
| author |
Itaru Ohira Jennifer M. Jackson Wolfgang Sturhahn Gregory J. Finkelstein Takaaki Kawazoe Thomas S. Toellner Akio Suzuki Eiji Ohtani |
| author_facet |
Itaru Ohira Jennifer M. Jackson Wolfgang Sturhahn Gregory J. Finkelstein Takaaki Kawazoe Thomas S. Toellner Akio Suzuki Eiji Ohtani |
| author_sort |
Itaru Ohira |
| title |
The influence of δ-(Al,Fe)OOH on seismic heterogeneities in Earth’s lower mantle |
| title_short |
The influence of δ-(Al,Fe)OOH on seismic heterogeneities in Earth’s lower mantle |
| title_full |
The influence of δ-(Al,Fe)OOH on seismic heterogeneities in Earth’s lower mantle |
| title_fullStr |
The influence of δ-(Al,Fe)OOH on seismic heterogeneities in Earth’s lower mantle |
| title_full_unstemmed |
The influence of δ-(Al,Fe)OOH on seismic heterogeneities in Earth’s lower mantle |
| title_sort |
influence of δ-(al,fe)ooh on seismic heterogeneities in earth’s lower mantle |
| publisher |
Nature Portfolio |
| publishDate |
2021 |
| url |
https://doaj.org/article/14721f6976be4b5089995685175aa5d5 |
| work_keys_str_mv |
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