Anomalous compressibility in (Fe,Al)-bearing bridgmanite: implications for the spin state of iron

Okuda, Y.; Ohta, Kenji; Sinmyo, Ryosuke; Hirose, Kei; Ohishi, Yasuo

doi:10.1007/s00269-020-01109-3

Cited by 3 publications

(3 citation statements)

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“…S1a). The chemical composition of the sample in our previous studies with the use of Al 2 O 3 pressure medium has never altered from that of the starting material 27 , 28 . The chemical composition of our bridgmanite sample before and after the experiment was analysed by EPMA JXA-8530F in the Tokyo Institute of Technology.…”

Section: Methodsmentioning

confidence: 90%

“…Those synthesized at relatively low pressure in a multi-anvil apparatus (MA) show no evidence of the spin transition 13 – 18 , implying a high-spin Fe throughout the lower mantle, which is consistent with theoretical studies 31 – 34 . On the other hand, other experiments showed the spin transition of ferric iron (Fe 3+ ) in octahedral sites (Si sites) of bridgmanite directly transformed at high pressure in a diamond anvil cell (DAC) 19 , 24 – 28 (Fig. 1 ).…”

Section: Introductionmentioning

confidence: 99%

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Low-spin ferric iron in primordial bridgmanite crystallized from a deep magma ocean

Okuda

Ohta

Nishihara

et al. 2021

Sci Rep

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The crystallization of the magma ocean resulted in the present layered structure of the Earth’s mantle. An open question is the electronic spin state of iron in bridgmanite (the most abundant mineral on Earth) crystallized from a deep magma ocean, which has been neglected in the crystallization history of the entire magma ocean. Here, we performed energy-domain synchrotron Mössbauer spectroscopy measurements on two bridgmanite samples synthesized at different pressures using the same starting material (Mg0.78Fe0.13Al0.11Si0.94O3). The obtained Mössbauer spectra showed no evidence of low-spin ferric iron (Fe3+) from the bridgmanite sample synthesized at relatively low pressure of 25 gigapascals, while that directly synthesized at a higher pressure of 80 gigapascals contained a relatively large amount. This difference ought to derive from the large kinetic barrier of Fe3+ rearranging from pseudo-dodecahedral to octahedral sites with the high-spin to low-spin transition in experiments. Our results indicate a certain amount of low-spin Fe3+ in the lower mantle bridgmanite crystallized from an ancient magma ocean. We therefore conclude that primordial bridgmanite with low-spin Fe3+ dominated the deeper part of an ancient lower mantle, which would contribute to lower mantle heterogeneity preservation and call for modification of the terrestrial mantle thermal evolution scenarios.

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Section: Methodsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Low-spin ferric iron in primordial bridgmanite crystallized from a deep magma ocean

Okuda

Ohta

Nishihara

et al. 2021

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…Numerous studies have addressed the pressure induced spin transition in iron-bearing compounds. 1–6 This transition can influence many physical and chemical properties 7 such as sound velocity, 8 conductivity, 9 compressibility, 10 material transport 11–14 or element partitioning. 15–19 Thus, a detailed understanding of the electronic structure of iron-bearing compounds in situ at extreme conditions, i.e.…”

Section: Introductionmentioning

confidence: 99%

High-efficiency X-ray emission spectroscopy of cold-compressed Fe₂O₃and laser-heated pressurized FeCO₃using a von Hámos spectrometer

Albers

Sakrowski

Thiering

et al. 2023

J. Anal. At. Spectrom.

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Compressibility of ferropericlase at high-temperature: Evidence for the iron spin crossover in seismic tomography

Trautner

Stackhouse

Turner

et al. 2023

Earth and Planetary Science Letters

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Anomalous compressibility in (Fe,Al)-bearing bridgmanite: implications for the spin state of iron

Cited by 3 publications

References 51 publications

Low-spin ferric iron in primordial bridgmanite crystallized from a deep magma ocean

Low-spin ferric iron in primordial bridgmanite crystallized from a deep magma ocean

High-efficiency X-ray emission spectroscopy of cold-compressed Fe₂O₃and laser-heated pressurized FeCO₃using a von Hámos spectrometer

Compressibility of ferropericlase at high-temperature: Evidence for the iron spin crossover in seismic tomography

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Anomalous compressibility in (Fe,Al)-bearing bridgmanite: implications for the spin state of iron

Cited by 3 publications

References 51 publications

Low-spin ferric iron in primordial bridgmanite crystallized from a deep magma ocean

Low-spin ferric iron in primordial bridgmanite crystallized from a deep magma ocean

High-efficiency X-ray emission spectroscopy of cold-compressed Fe2O3and laser-heated pressurized FeCO3using a von Hámos spectrometer

Compressibility of ferropericlase at high-temperature: Evidence for the iron spin crossover in seismic tomography

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High-efficiency X-ray emission spectroscopy of cold-compressed Fe₂O₃and laser-heated pressurized FeCO₃using a von Hámos spectrometer