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
收藏
页码：330 / 338
页数：9
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