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

通过同步加速器 MicroXANES 光谱对地质玻璃中的三价铁/二价铁比率进行原位微量分析以及比率与实验的相关性...

• 批准号: 9508128
• 负责人: Jeremy Delaney
• 金额: $ 5.04万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-08-15 至 1997-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9508128&HistoricalAwards=false
• 关键词: Situ; Microanalysis; Ferric; Ferrous; Iron

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.

这项研究将使用同步加速器微xanes光谱精确测量一套玻璃微米大小区域的铁/铁比率。通过穆斯堡尔光谱和湿化学分析表征的样品将用于校准同步加速器微xanes测量与玻璃中铁/铁比率之间的关系。该技术首次提供了测量亚铁或三铁（而不仅仅是单质铁）阳离子分配系数的可能性，因为可以在岩石学上真实的尺度上在共存相中测量氧化态。为了校准氧逸度对玻璃的铁/铁比的影响，将几个玻璃在控制逸度的气氛中在超流体温度范围内平衡并淬火以形成玻璃。