The dependence of the Fe2+-Mg cation-partitioning between olivine and basaltic liquid on pressure,temperature and composition期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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The dependence of the Fe2+-Mg cation-partitioning between olivine and basaltic liquid on pressure,temperature and composition

Authors:

Peter Ulmer

Institution:

1. Geophysical Laboratory, Carnegie Institution of Washington, 2801 Upton Street NW, 20008, Washington, DC, USA

Abstract:

The equilibrium partitioning of Fe²⁺ and Mg between olivine and liquid along a liquid line of descent has been determined for a calc-alkaline system, ranging in composition from picritic to andesitic. Experiments were conducted between 1000–1450° C and 1 bar to 30 kbar. Within the compositional range investigated ${\text{x}}_{Mg}^{liq} = 0.4 - 0.8$ and $log Kd_{Fe}^{ol - liq} = 0.624 - 4.86 \cdot Mg + 7.3 \cdot Mg^2 + 0.00343 \cdot P$ , the compositional dependence of the Fe²⁺ and Mg partitioning is a function of the Mg-content of the liquid. The Mg-content of the liquid correlates strongly with temperature. The variation of the Fe²⁺ and Mg partitioning were therefore evaluated individualy as functions of composition and temperature alone. The composition dependence of the cation-partitioning coefficients (Kd) is given by the following two equations:

$log Kd_{Fe}^{ol - liq} = 0.624 - 4.86 \cdot Mg + 7.3 \cdot Mg^2 + 0.00343 \cdot P$

Keywords:
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