In Situ Microanalysis of Ferric/Ferrous Iron Ratios in Geological Glasses by Synchrotron MicroXANES Spectroscopy and Correlation of the Ratios with Experimental...

9508128 Delaney这项研究将使用同步加速器microXANES光谱法精确测量一套玻璃中微米级区域的三价铁/亚铁比率。 穆斯堡尔谱和湿化学分析表征的样品将用于校准同步加速器microXANES测量和玻璃中的三价铁/二价铁比率之间的关系。 该技术首次提供了测量亚铁或三价铁（而不仅仅是元素铁）的阳离子分配系数的可能性，因为氧化态的测量可以在岩石学现实尺度上在共存相中进行。 为了校准氧逸度对玻璃的三价铁/亚铁比率的影响，将在受控逸度气氛中在一定范围的超液相线温度下平衡几种玻璃，并淬火以形成玻璃。

9508128 Delaney This research will measure precisely the ferric/ferrous ratios in micrometer-sized areas of a suite of glasses using synchrotron microXANES spectroscopy. Samples characterized by Mossbauer spectroscopy and wet chemical analysis will be used to calibrate the relationship between synchrotron microXANES measurements and ferric/ferrous ratios in the glasses. This technique provides, for the first time, the possibility of measuring cation partition coefficients for ferrous or ferric iron (instead of just elemental iron) because measurements of oxidation state can be made in coexisting phases on a petrologically realistic scale. To calibrate the influence of oxygen fugacity on the ferric/ferrous ratio of glasses, several glasses will be equilibrated at a range of superliquidus temperatures in a controlled fugacity atmosphere and quenched to form glasses.