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

Abstract 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 crystalliza...

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Autores principales:	Yoshiyuki Okuda, Kenji Ohta, Yu Nishihara, Naohisa Hirao, Tatsuya Wakamatsu, Sho Suehiro, Saori I. Kawaguchi, Yasuo Ohishi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1d76b3cf74684463acadd4c642c783fe
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spelling	oai:doaj.org-article:1d76b3cf74684463acadd4c642c783fe2021-12-02T17:37:23ZLow-spin ferric iron in primordial bridgmanite crystallized from a deep magma ocean10.1038/s41598-021-98991-w2045-2322https://doaj.org/article/1d76b3cf74684463acadd4c642c783fe2021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98991-whttps://doaj.org/toc/2045-2322Abstract 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.Yoshiyuki OkudaKenji OhtaYu NishiharaNaohisa HiraoTatsuya WakamatsuSho SuehiroSaori I. KawaguchiYasuo OhishiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yoshiyuki Okuda Kenji Ohta Yu Nishihara Naohisa Hirao Tatsuya Wakamatsu Sho Suehiro Saori I. Kawaguchi Yasuo Ohishi Low-spin ferric iron in primordial bridgmanite crystallized from a deep magma ocean
description	Abstract 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.
format	article
author	Yoshiyuki Okuda Kenji Ohta Yu Nishihara Naohisa Hirao Tatsuya Wakamatsu Sho Suehiro Saori I. Kawaguchi Yasuo Ohishi
author_facet	Yoshiyuki Okuda Kenji Ohta Yu Nishihara Naohisa Hirao Tatsuya Wakamatsu Sho Suehiro Saori I. Kawaguchi Yasuo Ohishi
author_sort	Yoshiyuki Okuda
title	Low-spin ferric iron in primordial bridgmanite crystallized from a deep magma ocean
title_short	Low-spin ferric iron in primordial bridgmanite crystallized from a deep magma ocean
title_full	Low-spin ferric iron in primordial bridgmanite crystallized from a deep magma ocean
title_fullStr	Low-spin ferric iron in primordial bridgmanite crystallized from a deep magma ocean
title_full_unstemmed	Low-spin ferric iron in primordial bridgmanite crystallized from a deep magma ocean
title_sort	low-spin ferric iron in primordial bridgmanite crystallized from a deep magma ocean
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/1d76b3cf74684463acadd4c642c783fe
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_version_	1718379870099079168

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

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