Distribution of Magnesium and Iron between Orthopyroxene and Calcic Pyroxene in Natural Mineral Assemblages
Distribution of Magnesium and Iron between Orthopyroxene and Calcic Pyroxene in Natural Mineral Assemblages
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天然矿物组合中斜方辉石和钙质辉石中镁和铁的分布
DOI：
10.1086/626953
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发表时间：
1963
期刊：
影响因子：
--
通讯作者：
R. Kretz
中科院分区：
文献类型：
--
作者：
R. Kretz
计算了不同岩石中64种钙辉石-斜方辉石(或斜方辉石)组合的镁铁交换和锰(镁，铁)交换分配系数。参照镁-铁交换的分配系数被命名为文件类{aastex}
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\begin{document}$$K_{D({\mathrm{Mg-Fe}})}\equiv\frac{X_{{\mathrm{MgSiO}}_{3}}}{1-X_{{\mathrm{MgSiO}}_{3}}}\cdot\frac{1-X_{{\mathrm{MgCaSi}}_{2}{\mathrm{O}}_{6}}}{X_{{\mathrm{MgCaSi}}_{2}{\mathrm{O}}_{6}}}$$\end{document}，其中，\DocentClass{aastex}
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\begin{document}$$X_{{\mathrm{MgSiO}}_{3}}$$\end{document}和文件类{aastex}
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\begin{document}$$X_{{\mathrm{MgCaSi}}_{2}{\mathrm{O}}_{6}}$$\end{document}是摩尔分数。在25个高级变质岩中，这个系数在0.51到0.65之间；在14个已知或推测是从硅酸盐熔体中结晶出来的岩石中，这个系数在0.65到0.86之间。发现两个异常值。在玄武岩中的超镁铁质结核中，该系数比任何其他岩石中的系数更接近于1。相对于Mn-(Mg，Fe)交换的分配系数是可变的，以至于目前不可能与温度或压力相关联。可以建立一个暂定的平衡图来说明镁-铁分配系数对温度和压力变化的响应。
Distribution coefficients with reference to Mg-Fe exchange and Mn-(Mg, Fe) exchange have been computed for sixty-four calcic pyroxene-orthopyroxene (or pigeonite) combinations from a variety of rocks. The distribution coefficient with reference to Mg-Fe exchange is denned as \documentclass{aastex}
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\begin{document}$$K_{D({\mathrm{Mg-Fe}})}\equiv\frac{X_{{\mathrm{MgSiO}}_{3}}}{1-X_{{\mathrm{MgSiO}}_{3}}} \cdot\frac{1-X_{{\mathrm{MgCaSi}}_{2}{\mathrm{O}}_{6}}}{X_{{\mathrm{MgCaSi}}_{2}{\mathrm{O}}_{6}}}$$\end{document}, where \documentclass{aastex}
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\begin{document}$$X_{{\mathrm{MgSiO}}_{3}}$$\end{document} and \documentclass{aastex}
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\begin{document}$$X_{{\mathrm{MgCaSi}}_{2}{\mathrm{O}}_{6}}$$\end{document} are mole fractions. In twenty-five high-grade metamorphic rocks the coefficient ranges from 0.51 to 0.65, and in fourteen rocks known or presumed to have crystallized from silicate melt, from 0.65 to 0.86. Two anomalous values were found. In ultramafic nodules in basaltic rock, the coefficient tends to approach unity more closely than in any other rocks. The distribution coefficient with reference to Mn-(Mg, Fe) exchange is variable to the extent that a correlation with temperature or pressure is not possible at present. A tentative equilibrium diagram may be constructed to illustrate the response of the Mg-Fe distribution coefficient to variations in temperature and pressure.