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首页> 美国卫生研究院文献>Wiley-Blackwell Online Open >Raman spectra of Martian glass analogues: A tool to approximate their chemical composition
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Raman spectra of Martian glass analogues: A tool to approximate their chemical composition

机译：火星玻璃类似物的拉曼光谱：一种估算其化学成分的工具

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Raman spectrometers will form a key component of the analytical suite of future planetary rovers intended to investigate geological processes on Mars. In order to expand the applicability of these spectrometers and use them as analytical tools for the investigation of silicate glasses, a database correlating Raman spectra to glass composition is crucial. Here we investigate the effect of the chemical composition of reduced silicate glasses on their Raman spectra. A range of compositions was generated in a diffusion experiment between two distinct, iron‐rich end‐members (a basalt and a peralkaline rhyolite), which are representative of the anticipated compositions of Martian rocks. Our results show that for silica‐poor (depolymerized) compositions the band intensity increases dramatically in the regions between 550–780 cm−1 and 820–980 cm−1. On the other hand, Raman spectra regions between 250–550 cm−1 and 1000–1250 cm−1 are well developed in silica‐rich (highly polymerized) systems. Further, spectral intensity increases at ~965 cm−1 related to the high iron content of these glasses (~7–17 wt % of FeOtot). Based on the acquired Raman spectra and an ideal mixing equation between the two end‐members we present an empirical parameterization that enables the estimation of the chemical compositions of silicate glasses within this range. The model is validated using external samples for which chemical composition and Raman spectra were characterized independently. Applications of this model range from microanalysis of dry and hydrous silicate glasses (e.g., melt inclusions) to in situ field investigations and studies under extreme conditions such as extraterrestrial (i.e., Mars) and submarine volcanic environments.
机译：拉曼光谱仪将成为旨在研究火星地​​质过程的未来行星漫游车分析套件的关键组成部分。为了扩展这些光谱仪的适用性并将其用作分析硅酸盐玻璃的分析工具，将拉曼光谱与玻璃成分相关联的数据库至关重要。在这里，我们研究了还原硅酸盐玻璃的化学成分对其拉曼光谱的影响。在两个不同的铁富集的最终成员（玄武岩和高碱性流纹岩）之间的扩散实验中产生了一系列成分，这些成分代表了火星岩石的预期成分。我们的结果表明，对于贫硅（解聚）组合物，谱带强度在550–780 cm -1 和820–980 cm -1 之间的区域急剧增加。另一方面，在富含二氧化硅（高度聚合）的系统中，拉曼光谱范围介于250–550 cm -1 和1000–1250 cm -1 之间。此外，光谱强度在〜965 ironcm -1 处增加，这与这些玻璃的高铁含量（FeOtot的〜7-17wt％）有关。基于获得的拉曼光谱和两个端部成员之间的理想混合方程，我们提出了经验参数化，可以估算该范围内的硅酸盐玻璃的化学成分。使用外部样品验证了该模型，这些样品的化学成分和拉曼光谱是独立表征的。该模型的应用范围从干燥和含水硅酸盐玻璃（例如熔体包裹体）的微分析到在极端条件下（例如地球外（即火星）和海底火山环境）的原位现场调查和研究。

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