Behavior of light elements in iron-silicate-water-sulfur system during early Earth’s evolution

Abstract Hydrogen (H) is considered to be one of the candidates for light elements in the Earth’s core, but the amount and timing of delivery have been unknown. We investigated the effects of sulfur (S), another candidate element in the core, on deuteration of iron (Fe) in iron–silicate–water system...

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Autores principales:	Riko Iizuka-Oku, Hirotada Gotou, Chikara Shito, Ko Fukuyama, Yuichiro Mori, Takanori Hattori, Asami Sano-Furukawa, Ken-ichi Funakoshi, Hiroyuki Kagi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3e9323d9d80642a69243915fa041279a
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spelling	oai:doaj.org-article:3e9323d9d80642a69243915fa041279a2021-12-02T18:02:55ZBehavior of light elements in iron-silicate-water-sulfur system during early Earth’s evolution10.1038/s41598-021-91801-32045-2322https://doaj.org/article/3e9323d9d80642a69243915fa041279a2021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-91801-3https://doaj.org/toc/2045-2322Abstract Hydrogen (H) is considered to be one of the candidates for light elements in the Earth’s core, but the amount and timing of delivery have been unknown. We investigated the effects of sulfur (S), another candidate element in the core, on deuteration of iron (Fe) in iron–silicate–water system up to 6–12 GPa, ~ 1200 K using in situ neutron diffraction measurements. The sample initially contained saturated water (D2O) as Mg(OD)2 in the ideal composition (Fe–MgSiO3–D2O) of the primitive Earth. In the existence of water and sulfur, phase transitions of Fe, dehydration of Mg(OD)2, and formation of iron sulfide (FeS) and silicates occurred with increasing temperature. The deuterium (D) solubility (x) in iron deuterides (FeD x ) increased with temperature and pressure, resulting in a maximum of x = 0.33(4) for the hydrous sample without S at 11.2 GPa and 1067 K. FeS was hardly deuterated until Fe deuteration had completed. The lower D concentrations in the S-containing system do not exceed the miscibility gap (x < ~ 0.4). Both H and S can be incorporated into solid Fe and other light elements could have dissolved into molten iron hydride and/or FeS during the later process of Earth’s evolution.Riko Iizuka-OkuHirotada GotouChikara ShitoKo FukuyamaYuichiro MoriTakanori HattoriAsami Sano-FurukawaKen-ichi FunakoshiHiroyuki KagiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Riko Iizuka-Oku Hirotada Gotou Chikara Shito Ko Fukuyama Yuichiro Mori Takanori Hattori Asami Sano-Furukawa Ken-ichi Funakoshi Hiroyuki Kagi Behavior of light elements in iron-silicate-water-sulfur system during early Earth’s evolution
description	Abstract Hydrogen (H) is considered to be one of the candidates for light elements in the Earth’s core, but the amount and timing of delivery have been unknown. We investigated the effects of sulfur (S), another candidate element in the core, on deuteration of iron (Fe) in iron–silicate–water system up to 6–12 GPa, ~ 1200 K using in situ neutron diffraction measurements. The sample initially contained saturated water (D2O) as Mg(OD)2 in the ideal composition (Fe–MgSiO3–D2O) of the primitive Earth. In the existence of water and sulfur, phase transitions of Fe, dehydration of Mg(OD)2, and formation of iron sulfide (FeS) and silicates occurred with increasing temperature. The deuterium (D) solubility (x) in iron deuterides (FeD x ) increased with temperature and pressure, resulting in a maximum of x = 0.33(4) for the hydrous sample without S at 11.2 GPa and 1067 K. FeS was hardly deuterated until Fe deuteration had completed. The lower D concentrations in the S-containing system do not exceed the miscibility gap (x < ~ 0.4). Both H and S can be incorporated into solid Fe and other light elements could have dissolved into molten iron hydride and/or FeS during the later process of Earth’s evolution.
format	article
author	Riko Iizuka-Oku Hirotada Gotou Chikara Shito Ko Fukuyama Yuichiro Mori Takanori Hattori Asami Sano-Furukawa Ken-ichi Funakoshi Hiroyuki Kagi
author_facet	Riko Iizuka-Oku Hirotada Gotou Chikara Shito Ko Fukuyama Yuichiro Mori Takanori Hattori Asami Sano-Furukawa Ken-ichi Funakoshi Hiroyuki Kagi
author_sort	Riko Iizuka-Oku
title	Behavior of light elements in iron-silicate-water-sulfur system during early Earth’s evolution
title_short	Behavior of light elements in iron-silicate-water-sulfur system during early Earth’s evolution
title_full	Behavior of light elements in iron-silicate-water-sulfur system during early Earth’s evolution
title_fullStr	Behavior of light elements in iron-silicate-water-sulfur system during early Earth’s evolution
title_full_unstemmed	Behavior of light elements in iron-silicate-water-sulfur system during early Earth’s evolution
title_sort	behavior of light elements in iron-silicate-water-sulfur system during early earth’s evolution
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3e9323d9d80642a69243915fa041279a
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Behavior of light elements in iron-silicate-water-sulfur system during early Earth’s evolution

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