Solving Controversies on the Iron Phase Diagram Under High Pressure

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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Solving Controversies on the Iron Phase Diagram Under High Pressure. / Morard, Guillaume; Boccato, Silvia; Rosa, Angelika D.; Anzellini, Simone; Miozzi, Francesca; Henry, Laura; Garbarino, Gaston; Mezouar, Mohamed; Harmand, Marion; Guyot, François; Boulard, Eglantine; Kantor, Innokenty; Irifune, Tetsuo; Torchio, Raffaella.

In: Geophysical Research Letters, Vol. 45, No. 20, 2018, p. 11,074-11,082.

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

Harvard

Morard, G, Boccato, S, Rosa, AD, Anzellini, S, Miozzi, F, Henry, L, Garbarino, G, Mezouar, M, Harmand, M, Guyot, F, Boulard, E, Kantor, I, Irifune, T & Torchio, R 2018, 'Solving Controversies on the Iron Phase Diagram Under High Pressure', Geophysical Research Letters, vol. 45, no. 20, pp. 11,074-11,082. https://doi.org/10.1029/2018GL079950

APA

Morard, G., Boccato, S., Rosa, A. D., Anzellini, S., Miozzi, F., Henry, L., ... Torchio, R. (2018). Solving Controversies on the Iron Phase Diagram Under High Pressure. Geophysical Research Letters, 45(20), 11,074-11,082. https://doi.org/10.1029/2018GL079950

CBE

Morard G, Boccato S, Rosa AD, Anzellini S, Miozzi F, Henry L, Garbarino G, Mezouar M, Harmand M, Guyot F, Boulard E, Kantor I, Irifune T, Torchio R. 2018. Solving Controversies on the Iron Phase Diagram Under High Pressure. Geophysical Research Letters. 45(20):11,074-11,082. https://doi.org/10.1029/2018GL079950

MLA

Vancouver

Morard G, Boccato S, Rosa AD, Anzellini S, Miozzi F, Henry L et al. Solving Controversies on the Iron Phase Diagram Under High Pressure. Geophysical Research Letters. 2018;45(20):11,074-11,082. https://doi.org/10.1029/2018GL079950

Author

Morard, Guillaume ; Boccato, Silvia ; Rosa, Angelika D. ; Anzellini, Simone ; Miozzi, Francesca ; Henry, Laura ; Garbarino, Gaston ; Mezouar, Mohamed ; Harmand, Marion ; Guyot, François ; Boulard, Eglantine ; Kantor, Innokenty ; Irifune, Tetsuo ; Torchio, Raffaella. / Solving Controversies on the Iron Phase Diagram Under High Pressure. In: Geophysical Research Letters. 2018 ; Vol. 45, No. 20. pp. 11,074-11,082.

Bibtex

@article{c1decfc08c3a44feb04caaf89b8443e8,
title = "Solving Controversies on the Iron Phase Diagram Under High Pressure",
abstract = "As the main constituent of planetary cores, pure iron phase diagram under high pressure and temperature is of fundamental importance in geophysics and planetary science. However, previously reported iron-melting curves show large discrepancies (up to 1000 K at the Earth's core–mantle boundary, 136 GPa), resulting in persisting high uncertainties on the solid-liquid phase boundary. Here we unambiguously show that the observed differences commonly attributed to the nature of the used melting diagnostic are due to a carbon contamination of the sample as well as pressure overestimation at high temperature. The high melting temperature of pure iron under core-mantle boundary (4250 ± 250 K), here determined by X-ray absorption experiments at the Fe K-edge, indicates that volatile light elements such as sulfur, carbon, or hydrogen are required to lower the crystallization temperature of the Earth's liquid outer core in order to prevent extended melting of the surrounding silicate mantle.",
author = "Guillaume Morard and Silvia Boccato and Rosa, {Angelika D.} and Simone Anzellini and Francesca Miozzi and Laura Henry and Gaston Garbarino and Mohamed Mezouar and Marion Harmand and Fran{\cc}ois Guyot and Eglantine Boulard and Innokenty Kantor and Tetsuo Irifune and Raffaella Torchio",
year = "2018",
doi = "10.1029/2018GL079950",
language = "English",
volume = "45",
pages = "11,074--11,082",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "Wiley-Blackwell",
number = "20",

}

RIS

TY - JOUR

T1 - Solving Controversies on the Iron Phase Diagram Under High Pressure

AU - Morard, Guillaume

AU - Boccato, Silvia

AU - Rosa, Angelika D.

AU - Anzellini, Simone

AU - Miozzi, Francesca

AU - Henry, Laura

AU - Garbarino, Gaston

AU - Mezouar, Mohamed

AU - Harmand, Marion

AU - Guyot, François

AU - Boulard, Eglantine

AU - Kantor, Innokenty

AU - Irifune, Tetsuo

AU - Torchio, Raffaella

PY - 2018

Y1 - 2018

N2 - As the main constituent of planetary cores, pure iron phase diagram under high pressure and temperature is of fundamental importance in geophysics and planetary science. However, previously reported iron-melting curves show large discrepancies (up to 1000 K at the Earth's core–mantle boundary, 136 GPa), resulting in persisting high uncertainties on the solid-liquid phase boundary. Here we unambiguously show that the observed differences commonly attributed to the nature of the used melting diagnostic are due to a carbon contamination of the sample as well as pressure overestimation at high temperature. The high melting temperature of pure iron under core-mantle boundary (4250 ± 250 K), here determined by X-ray absorption experiments at the Fe K-edge, indicates that volatile light elements such as sulfur, carbon, or hydrogen are required to lower the crystallization temperature of the Earth's liquid outer core in order to prevent extended melting of the surrounding silicate mantle.

AB - As the main constituent of planetary cores, pure iron phase diagram under high pressure and temperature is of fundamental importance in geophysics and planetary science. However, previously reported iron-melting curves show large discrepancies (up to 1000 K at the Earth's core–mantle boundary, 136 GPa), resulting in persisting high uncertainties on the solid-liquid phase boundary. Here we unambiguously show that the observed differences commonly attributed to the nature of the used melting diagnostic are due to a carbon contamination of the sample as well as pressure overestimation at high temperature. The high melting temperature of pure iron under core-mantle boundary (4250 ± 250 K), here determined by X-ray absorption experiments at the Fe K-edge, indicates that volatile light elements such as sulfur, carbon, or hydrogen are required to lower the crystallization temperature of the Earth's liquid outer core in order to prevent extended melting of the surrounding silicate mantle.

U2 - 10.1029/2018GL079950

DO - 10.1029/2018GL079950

M3 - Journal article

VL - 45

SP - 11,074-11,082

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 20

ER -