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Application of Raman spectroscopy for identification of rinneite (K3NaFeCl6) in inclusions in minerals
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-10-06 , DOI: 10.1002/jrs.6005
Svetlana Grishina 1 , Peter Koděra 2 , Sergey Goryainov 1 , Aleksandr Oreshonkov 3, 4 , Yurii Seryotkin 1, 5 , František Šimko 6 , Alexander G. Polozov 7
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Solid daughter phases in fluid and salt melt inclusions in minerals provide important clues to characterization of mineral‐forming processes. The analysis of the fluid inclusions often requires the exposure of the daughter minerals. Rinneite (K3NaFeCl6), which is a hygroscopic mineral, decomposes in air and cannot thus be identified by conventional methods. A combined approach has been applied for investigation of synthetic and natural rinneite to acquire its diagnostic Raman spectrum for a nondestructive identification. We used natural rinneite inclusions in halite, suitable for applying a complex of methods, to clear up the reference spectrum. Improved high‐resolution X‐ray diffraction (XRD) data obtained from natural rinneite inclusion are comparable with that of previously published, with similar unit cell dimensions. Polarized Raman spectra of natural inclusions were obtained using different geometries and polarization of the incident and scattered light. Interpretation of experimental Raman spectra was performed within the framework of lattice dynamics simulations and group analysis. Individual spectral bands are interpreted in terms of Raman‐active vibrational modes of K3NaFeCl6 structural units. Raman spectrum of synthetic rinneite with main peaks at 75, 91, 103, 143, 167, 171, 187, and 239 cm−1 agrees well with the spectra of rinneite inclusions in halite from the Nepa potash deposit and rinneite daughter minerals in salt melt inclusions hosted by quartz veinlets from the porphyry gold systems in the Central Slovakia Volcanic Field. This provides a firm basis for any future identification of this mineral worldwide, using nondestructive Raman spectroscopy.

中文翻译:

拉曼光谱法在矿物包裹体中菱锰矿(K3NaFeCl6)鉴别中的应用

矿物中流体和盐熔体包裹体中的固态子相为表征矿物形成过程提供了重要线索。流体包裹体的分析通常需要暴露子矿物质。菱锰矿(K 3 NaFeCl 6)是一种吸湿性矿物,会在空气中分解,因此无法通过常规方法进行识别。一种组合方法已应用于合成和天然菱锰矿的研究,以获取其诊断拉曼光谱,以进行非破坏性鉴定。我们在岩盐中使用了天然的菱锰矿夹杂物,适用于应用多种方法,以清除参考光谱。从天然锰矿夹杂物中获得的改进的高分辨率X射线衍射(XRD)数据与以前发表的数据具有可比性,具有相似的晶胞尺寸。使用不同的几何形状以及入射光和散射光的偏振,可以得到天然包裹体的偏振拉曼光谱。实验拉曼光谱的解释是在晶格动力学模拟和组分析的框架内进行的。3 NaFeCl 6个结构单元。主要峰位于75、91、103、143、167、171、187和239 cm -1的合成菱锰矿的拉曼光谱与Nepa钾盐矿床岩盐中的菱锰矿夹杂物光谱和盐熔体中的菱锰矿子矿物光谱非常吻合斯洛伐克中部火山岩田地斑岩金矿系统的石英细粒所包裹的夹杂物。这为将来使用非破坏性拉曼光谱法鉴定该矿物提供了坚实的基础。
更新日期:2020-12-10
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