Equilibrium high-temperature Fe isotope fractionation between fayalite and magnetite: An experimental calibration

被引：131

作者：

Shahar, Anat ^{[1
]}

Young, Edward D. ^{[1
,2
]}

Manning, Craig E. ^{[1
]}

机构：

[1] Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90095 USA

[2] Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 2008年 / 268卷 / 3-4期

基金：

美国国家科学基金会;

关键词：

iron isotope; thermometer; igneous rocks; high-temperature; three-isotope exchange; magnetite;

D O I：

10.1016/j.epsl.2008.01.026

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The iron isotopic fractionation factor between magnetite and fayalite was measured at high temperature in a piston-cylinder apparatus. For the first time, the three-isotope method [Matsuhisa, J., Goldsmith, J. R., and Clayton, R. N., 1978. Mechanisms of hydrothermal crystallisation of quartz at 250 degrees C and 15 kbar. Geochim. Cosmochim. Acta 42, 173-182.] has been used to determine equilibrium fractionation between two minerals directly. The experimentally-determined temperature-dependent iron isotope fractionation between fayalite and magnetite is described by 10(3)ln alpha(57)(Mag-Fa) congruent to Delta(57) FeMag-Fa = 0.30 (+/- 0.024) x 10(6) / T-2. The equation predicts measurable fractionation at magmatic temperatures. Our work bears on the magnitude of Fe isotope fractionation attending differentiation in magmatic systems and provides a new isotope thermometer for coexisting fayalite and magnetite. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：330 / 338

页数：9

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