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首页> 外文期刊>Contributions to Mineralogy and Petrology >Characterization of water in synthetic rhyolitic glasses and natural melt inclusions by Raman spectroscopy
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Characterization of water in synthetic rhyolitic glasses and natural melt inclusions by Raman spectroscopy

机译：用拉曼光谱表征合成流纹玻璃和天然熔体中的水

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摘要

Raman spectroscopy was used to analyze quantitatively water in silicate glasses and melt inclusions and to monitor H_2O-OH speciation. Calibration is based on synthetic glasses with various water contents (0.02-7.67% H_2O); water determination and OH-H_2O differentiation on the area of the Si-O broad band at 468 cm~(-1) and the asymmetric O-H band at 3,550 cm~(-1). Each Raman spectrum has been decomposed into four Gaussian + Lorentzian components centered at 3,330, 3,458, 3,560, and 3,626 cm~(-1) using the Levenberg-Marquardt algorithm. These components are interpreted to be two different types of H2O molecule sites. The influence of the temperature on the loss of water is more important for molecular water than for the hydroxyl groups. The H_2O-OH partition confirms the typical evolution of water speciation in rhyolitic glasses as a function of the bulk water content. Method limitations have been studied for the application to natural melt inclusions.
机译：拉曼光谱法用于定量分析硅酸盐玻璃和熔体中的水分，并监测H_2O-OH的形态。校准是基于各种水含量（0.02-7.67％H_2O）的合成玻璃;在468 cm〜（-1）处的Si-O宽带区域和3,550 cm〜（-1）处的不对称O-H带的水测定和OH-H_2O区分。使用Levenberg-Marquardt算法将每个拉曼光谱分解为四个高斯+洛伦兹分量，分别位于3,330、3,458、3,560和3,626 cm〜（-1）处。这些成分被解释为两种不同类型的H2O分子位点。温度对水损失的影响对于分子水比对羟基更为重要。 H_2O-OH分区证实了流纹玻璃中水形态的典型演变与总含水量的关系。已经研究了方法局限性以应用于天然熔体夹杂物。

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