Study of Mg–Fe content in tourmalines from the dravite–schorl series by Raman spectroscopy

IF 2.4 3区 化学 Q2 SPECTROSCOPY
Lorenzo Pasetti, Laura Fornasini, Luciana Mantovani, Sergio Andò, Simona Raneri, Vincenzo Palleschi, Danilo Bersani
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引用次数: 0

Abstract

Thanks to their high chemical and mechanical stability, their diffusion in all types of detrital sediments and their complex structural formula (XY3Z6(T6O18)(BO3)3V3W), tourmalines have attracted strong interest in provenance studies since, from their chemical composition, it is possible to reconstruct the source rocks in ancient sediments. Dravite and schorl, belonging to the alkali subgroup 1, are the most abundant tourmaline species, and they have different Y-site compositions in the unit cell: dravite has more magnesium, while schorl has a higher iron content. For this reason, it is important to measure the Mg–Fe relative content in order to classify the analysed tourmalines in the dravite–schorl series. Raman spectroscopy is a suitable technique as it allows quick and easy measurements that provide chemical and structural information on tourmalines with a high spatial resolution, thus allowing analysis of small grains that could be found in sediments. In this work, we correlated the relative Mg–Fe content (x = Mg/(Mg + Fe)) in different tourmaline samples from the dravite–schorl series ( Na Mg x Fe 1 x 3 Al 6 Si 6 O 18 BO 3 3 OH 3 OH) with variations in Raman spectrum parameters in order to find a model for quick tourmaline identification useful for provenance studies. The chemical compositions of the analysed tourmalines are obtained by scanning electron microscope coupled with energy-dispersive spectroscopy (SEM-EDS). Raman measurements with a portable spectrometer have also been performed in order to evaluate our results for in situ applications.

Abstract Image

Abstract Image

利用拉曼光谱研究德拉韦特-肖尔系列电气石中的镁-铁含量
由於電氣石具有高度的化學和機械穩定性、在各種碎屑沉積物中的擴散性以及複雜的結構式(XY3Z6(T6O18)(BO3)3V3W),電氣石在產地研究中引起了強烈的興趣,因為從電氣石的化學成分可以重建古代沉積物的源岩。屬於鹼性亞群 1 的德拉偉石(Dravite)和雪鏡石(schorl)是最豐富的電氣石品種,它們在單胞中具有不同的 Y 位成分:德拉偉石具有較多的鎂,而雪鏡石則具有較高的鐵含量。因此,必须测量镁-铁的相对含量,以便将所分析的电气石归类为德拉维斯特-肖尔系列。拉曼光谱是一种合适的技术,因为它可以进行快速、简便的测量,以较高的空间分辨率提供电气石的化学和结构信息,从而对沉积物中的小颗粒进行分析。在这项工作中在这项工作中,我们对来自dravite-schorl系列的不同电气石样本(Na(MgxFe1-x)3Al6(Si6O18)(BO3)3(OH)3OH$$Na{left({Mg}_x{Fe}_{1-)x}/right)}_3{Al}_6/left({Si}_6{O}_{18}/right){\left({BO}_3/right)}_3{(OH)}_3 OH$$) 随着拉曼光谱参数的变化而变化,目的是找到一个对来源研究有用的快速电气石鉴定模型。所分析的电气石的化学成分是通过扫描电子显微镜和能量色散光谱(SEM-EDS)获得的。此外,还使用便携式光谱仪进行了拉曼测量,以评估我们在现场应用中的结果。
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来源期刊
CiteScore
5.40
自引率
8.00%
发文量
185
审稿时长
3.0 months
期刊介绍: The Journal of Raman Spectroscopy is an international journal dedicated to the publication of original research at the cutting edge of all areas of science and technology related to Raman spectroscopy. The journal seeks to be the central forum for documenting the evolution of the broadly-defined field of Raman spectroscopy that includes an increasing number of rapidly developing techniques and an ever-widening array of interdisciplinary applications. Such topics include time-resolved, coherent and non-linear Raman spectroscopies, nanostructure-based surface-enhanced and tip-enhanced Raman spectroscopies of molecules, resonance Raman to investigate the structure-function relationships and dynamics of biological molecules, linear and nonlinear Raman imaging and microscopy, biomedical applications of Raman, theoretical formalism and advances in quantum computational methodology of all forms of Raman scattering, Raman spectroscopy in archaeology and art, advances in remote Raman sensing and industrial applications, and Raman optical activity of all classes of chiral molecules.
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