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首页> 外文期刊>Contributions to Mineralogy and Petrology >An experimental study of the effect of iron on magnesiochloritoid-talc-clinochlore-kyanite stability
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An experimental study of the effect of iron on magnesiochloritoid-talc-clinochlore-kyanite stability

机译：铁对镁氯仿滑石-斜绿石-蓝晶石稳定性影响的实验研究

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摘要

The influence of Fe on the reaction clinochlore + kyanite + magnesiochloritoid - talc (1) was determined experimentally as a function of pressure (1.6-2.6 GPa) and composition at 600 and 540 deg C. Analytical electron microscopy (AEM) was used to determine the compositions of the coexisting phases in these complex multiphase run products. Within the compositional range studied (x_(Fe)~(bulk) = 012-0.34), chlorite solid solutions were always richer in magnesium than the coexisting chloritoid solid solutions. Fractionation of Fe into the chloritoid extends the stability field of the assemblage chloritoid plus talc towards lower pressures. However, the extent of the stability field for increasing x_(Fe) is less than one would expect for ideal mixing behaviour in chloritoid and chlorite, and indicates a moderate positive deviation from ideality for chloritoid solid solutions. The thermodynamic data for magnesiochloritoid given in two earlier studies are in good agreement with the present experiments, those of a third study yield pressures which are much too high, at least compared with the experiments at 600 deg C.
机译：在实验中确定了铁对斜绿石+蓝晶石+镁盐氯仿-滑石粉（1）的影响与压力（1.6-2.6 GPa）和在600和540摄氏度下的成分的关系。使用分析电子显微镜（AEM）确定这些复杂的多相运行产品中共存相的组成。在所研究的组成范围内（x_（Fe）〜（bulk）= 012-0.34），亚氯酸盐固溶体总是比共存的类固醇类固溶体富含镁。将铁分馏到类胡萝卜素中，将组合的类胡萝卜素加滑石的稳定性范围扩展到较低的压力。但是，增加x_（Fe）的稳定性场的范围小于类固醇和亚氯酸盐中理想混合行为的预期范围，并且表明与类固醇固溶体的理想度之间存在适度的正偏差。在两项较早的研究中给出的镁盐类固醇的热力学数据与本实验非常吻合，第三项研究的结果至少与600摄氏度的实验相比屈服压力过高。

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