Iron isotope fractionation and the oxygen fugacity of the mantle

Helen M. Williams; Catherine A. McCammon; Anne H. Peslier; Alex N. Halliday; Nadya Teutsch; Sylvain Levasseur; Jean Pierre Burg

doi:10.1126/science.1095679

Iron isotope fractionation and the oxygen fugacity of the mantle

Helen M. Williams
, Catherine A. McCammon
, Anne H. Peslier
, Alex N. Halliday
, Nadya Teutsch
, Sylvain Levasseur
, Jean Pierre Burg

Research output: Contribution to journal › Article › peer-review

Abstract

The oxygen fugacity of the mantle exerts a fundamental influence on mantle melting, volatile speciation, and the development of the atmosphere. However, its evolution through time is poorly understood. Changes in mantle oxidation state should be reflected in the Fe³⁺Fe²⁺ of mantle minerals, and hence in stable iron isotope fractionation. Here it is shown that there are substantial (1.7 per mil) systematic variations in the iron isotope compositions (δ^57/54Fe) of mantle spinels. Spinel δ^57/54Fe values correlate with relative oxygen fugacity, Fe³⁺/σFe, and chromium number, and provide a proxy of changes in mantle oxidation state, melting, and volatile recycling.

Original language	English
Pages (from-to)	1656-1659
Number of pages	4
Journal	Science
Volume	304
Issue number	5677
DOIs	https://doi.org/10.1126/science.1095679
State	Published - 11 Jun 2004
Externally published	Yes

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title = "Iron isotope fractionation and the oxygen fugacity of the mantle",

abstract = "The oxygen fugacity of the mantle exerts a fundamental influence on mantle melting, volatile speciation, and the development of the atmosphere. However, its evolution through time is poorly understood. Changes in mantle oxidation state should be reflected in the Fe3+Fe2+ of mantle minerals, and hence in stable iron isotope fractionation. Here it is shown that there are substantial (1.7 per mil) systematic variations in the iron isotope compositions (δ57/54Fe) of mantle spinels. Spinel δ57/54Fe values correlate with relative oxygen fugacity, Fe3+/σFe, and chromium number, and provide a proxy of changes in mantle oxidation state, melting, and volatile recycling.",

author = "Williams, \{Helen M.\} and McCammon, \{Catherine A.\} and Peslier, \{Anne H.\} and Halliday, \{Alex N.\} and Nadya Teutsch and Sylvain Levasseur and Burg, \{Jean Pierre\}",

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T1 - Iron isotope fractionation and the oxygen fugacity of the mantle

AU - Williams, Helen M.

AU - McCammon, Catherine A.

AU - Peslier, Anne H.

AU - Halliday, Alex N.

AU - Teutsch, Nadya

AU - Levasseur, Sylvain

AU - Burg, Jean Pierre

PY - 2004/6/11

Y1 - 2004/6/11

N2 - The oxygen fugacity of the mantle exerts a fundamental influence on mantle melting, volatile speciation, and the development of the atmosphere. However, its evolution through time is poorly understood. Changes in mantle oxidation state should be reflected in the Fe3+Fe2+ of mantle minerals, and hence in stable iron isotope fractionation. Here it is shown that there are substantial (1.7 per mil) systematic variations in the iron isotope compositions (δ57/54Fe) of mantle spinels. Spinel δ57/54Fe values correlate with relative oxygen fugacity, Fe3+/σFe, and chromium number, and provide a proxy of changes in mantle oxidation state, melting, and volatile recycling.

AB - The oxygen fugacity of the mantle exerts a fundamental influence on mantle melting, volatile speciation, and the development of the atmosphere. However, its evolution through time is poorly understood. Changes in mantle oxidation state should be reflected in the Fe3+Fe2+ of mantle minerals, and hence in stable iron isotope fractionation. Here it is shown that there are substantial (1.7 per mil) systematic variations in the iron isotope compositions (δ57/54Fe) of mantle spinels. Spinel δ57/54Fe values correlate with relative oxygen fugacity, Fe3+/σFe, and chromium number, and provide a proxy of changes in mantle oxidation state, melting, and volatile recycling.

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DO - 10.1126/science.1095679

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VL - 304

SP - 1656

EP - 1659

JO - Science

JF - Science

IS - 5677

ER -

Iron isotope fractionation and the oxygen fugacity of the mantle

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