Effect of sulfur on sound velocity of liquid iron under Martian core conditions

Sulfur has been considered to be a predominant light element in the Martian core, and thus the sound velocity of Fe-S alloys at relevant high pressure and temperature is of great importance to interpret its seismological data. Here we measured the compressional sound velocity (V(P)) of liquid Fe, Fe...

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Autores principales: Nishida, Keisuke, Shibazaki, Yuki, Terasaki, Hidenori, Higo, Yuji, Suzuki, Akio, Funamori, Nobumasa, Hirose, Kei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7220916/
https://www.ncbi.nlm.nih.gov/pubmed/32404909
http://dx.doi.org/10.1038/s41467-020-15755-2
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author Nishida, Keisuke
Shibazaki, Yuki
Terasaki, Hidenori
Higo, Yuji
Suzuki, Akio
Funamori, Nobumasa
Hirose, Kei
author_facet Nishida, Keisuke
Shibazaki, Yuki
Terasaki, Hidenori
Higo, Yuji
Suzuki, Akio
Funamori, Nobumasa
Hirose, Kei
author_sort Nishida, Keisuke
collection PubMed
description Sulfur has been considered to be a predominant light element in the Martian core, and thus the sound velocity of Fe-S alloys at relevant high pressure and temperature is of great importance to interpret its seismological data. Here we measured the compressional sound velocity (V(P)) of liquid Fe, Fe(80)S(20) and Fe(57)S(43) using ultrasonic pulse-echo overlap method combined with a Kawai-type multi-anvil apparatus up to 20 GPa, likely corresponding to the condition at the uppermost core of Mars. The results demonstrate that the V(P) of liquid iron is least sensitive to its sulfur concentration in the Mars’ whole core pressure range. The comparison of seismic wave speeds of Fe-S liquids with future observations will therefore tell whether the Martian core is molten and contains impurity elements other than sulfur.
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spelling pubmed-72209162020-05-15 Effect of sulfur on sound velocity of liquid iron under Martian core conditions Nishida, Keisuke Shibazaki, Yuki Terasaki, Hidenori Higo, Yuji Suzuki, Akio Funamori, Nobumasa Hirose, Kei Nat Commun Article Sulfur has been considered to be a predominant light element in the Martian core, and thus the sound velocity of Fe-S alloys at relevant high pressure and temperature is of great importance to interpret its seismological data. Here we measured the compressional sound velocity (V(P)) of liquid Fe, Fe(80)S(20) and Fe(57)S(43) using ultrasonic pulse-echo overlap method combined with a Kawai-type multi-anvil apparatus up to 20 GPa, likely corresponding to the condition at the uppermost core of Mars. The results demonstrate that the V(P) of liquid iron is least sensitive to its sulfur concentration in the Mars’ whole core pressure range. The comparison of seismic wave speeds of Fe-S liquids with future observations will therefore tell whether the Martian core is molten and contains impurity elements other than sulfur. Nature Publishing Group UK 2020-05-13 /pmc/articles/PMC7220916/ /pubmed/32404909 http://dx.doi.org/10.1038/s41467-020-15755-2 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Nishida, Keisuke
Shibazaki, Yuki
Terasaki, Hidenori
Higo, Yuji
Suzuki, Akio
Funamori, Nobumasa
Hirose, Kei
Effect of sulfur on sound velocity of liquid iron under Martian core conditions
title Effect of sulfur on sound velocity of liquid iron under Martian core conditions
title_full Effect of sulfur on sound velocity of liquid iron under Martian core conditions
title_fullStr Effect of sulfur on sound velocity of liquid iron under Martian core conditions
title_full_unstemmed Effect of sulfur on sound velocity of liquid iron under Martian core conditions
title_short Effect of sulfur on sound velocity of liquid iron under Martian core conditions
title_sort effect of sulfur on sound velocity of liquid iron under martian core conditions
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7220916/
https://www.ncbi.nlm.nih.gov/pubmed/32404909
http://dx.doi.org/10.1038/s41467-020-15755-2
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