Iron isotope fractionation and the oxygen fugacity of the mantle

被引：166

作者：

Williams, HM

McCammon, CA

Peslier, AH

Halliday, AN

Teutsch, N

Levasseur, S

Burg, JP

机构：

[1] ETH, Dept Earth Sci, CH-8092 Zurich, Switzerland

[2] Univ Bayreuth, Bayer Geoinst, D-95440 Bayreuth, Germany

[3] Univ Houston, Texas Ctr Superconduct, Houston, TX 77204 USA

来源：

SCIENCE | 2004年 / 304卷 / 5677期

关键词：

D O I：

10.1126/science.1095679

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 (delta(57/54)Fe) of mantle spinels. Spinel delta(57/54)Fe values correlate with relative oxygen fugacity, Fe3+/SigmaFe, and chromium number, and provide a proxy of changes in mantle oxidation state, melting, and volatile recycling.

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页码：1656 / 1659

页数：4

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