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首页> 外文期刊>Contributions to Mineralogy and Petrology >The effect of titanium and phosphorus on ferric/ferrous ratio in silicate melts: an experimental study
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The effect of titanium and phosphorus on ferric/ferrous ratio in silicate melts: an experimental study

机译：钛和磷对硅酸盐熔体中铁/铁比的影响：实验研究

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The effect of TiO2 and P2O5 on the ferric/ferrous ratio in silicate melts was investigated in model silicate melts at air conditions in the temperature range 1,400–1,550 °C at 1-atm total pressure. The base composition of the anorthite–diopside eutectic composition was modified with 10 wt % Fe2O3 and variable amounts of TiO2 (up to 30 wt %) or P2O5 (up to 20 wt %). Some compositions also contained higher SiO2 concentrations to compare the role of SiO2, TiO2, and P2O5 on the Fe3+/Fe2+ ratio. The ferric/ferrous ratio in experimental glasses was analyzed using a wet chemical technique with colorimetric detection of ferrous iron. It is shown that at constant temperature, an increase in SiO2, TiO2, and P2O5 content results in a decrease in the ferric/ferrous ratio. The effects of TiO2 and SiO2 on the Fe3+/Fe2+ ratio was found to be almost identical. In contrast, adding P2O5 was found to decrease ferric/ferrous ratio much more effectively than adding silica. The results were compared with the predictions from the published empirical equations forecasting Fe3+/Fe2+ ratio. It was demonstrated that the effects of TiO2 are minor but that the effects of P2O5 should be included in models to better describe ferric/ferrous ratio in phosphorus-bearing silicate melts. Based on our observations, the determination of the prevailing fO2 in magmas from the Fe3+/Fe2+ ratio in natural glasses using empirical equations published so far is discussed critically.
机译：在空气压力范围为1,400–1,550°C，总气压为1 atm的空气条件下，研究了模型硅酸盐熔体中TiO2和P2O5对硅酸盐熔体中铁/铁比的影响。钙长石-透辉石共晶组合物的基本组成用10wt％的Fe2O3和可变数量的TiO2（最高30wt％）或P2O5（最高20wt％）改性。一些组合物还包含较高的SiO2浓度，以比较SiO2，TiO2和P2O5对Fe3 + / Fe2 +比率的作用。使用湿化学技术和比色法检测亚铁，分析了实验玻璃中的铁/铁比。结果表明，在恒定温度下，SiO2，TiO2和P2O5含量的增加导致铁/铁比的降低。发现TiO2和SiO2对Fe3 + / Fe2 +比的影响几乎相同。相反，发现添加P2O5比添加二氧化硅更有效地降低了铁/铁比。将结果与已发布的预测Fe3 + / Fe2 +比的经验方程式的预测结果进行比较。结果表明，TiO2的影响较小，但应在模型中包括P2O5的影响，以更好地描述含磷硅酸盐熔体中的铁/铁比。根据我们的观察，使用到目前为止已发表的经验公式，对天然玻璃中Fe3 + / Fe2 +比率对岩浆中主要fO2的确定进行了严格的讨论。

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