Brillouin spectroscopy of natural and chemically complex volcanic glasses: The role of divalent cations

IF 3.6 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology Pub Date : 2025-03-07 DOI:10.1016/j.chemgeo.2025.122719

Alessandro Pisello , Silvia Corezzi , Michele Cassetta , Francesco Radica , Lucia Comez , Gianluca Iezzi , Andrea Vitrano , Francesco Pasqualino Vetere , Diego Perugini

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Abstract

This work investigates using Brillouin light scattering (BLS) spectroscopy the relationship between chemistry and longitudinal (or pressure) sound-wave propagation on a large dataset of alkaline to sub-alkaline silicate glasses. Results show that the frequency f_B of the Brillouin peak decreases with the silica content and the Silica vs. Calcia - Ferrous oxide - Magnesia (SCFM) parameter, while it increases with the degree of polymerization expressed by the ratio of nonbridging oxygens to tetrahedral cations (NBO/T). It is possible to infer that the values of both f_B and the real part of the longitudinal elastic modulus M' are tightly related to the content of divalent cations (M²⁺) participating in the silicate network. Our findings suggest that alkaline earth metals and Fe²⁺ linearly speed up the longitudinal acoustic waves in silicate glasses. This might open a new window on the possibility of using the BLS technique for rapid and accurate determinations of physical and chemical properties of natural glasses present on Earth and other planetary bodies.

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天然和化学复杂火山玻璃的布里渊光谱：二价阳离子的作用

本研究利用布里渊光散射（BLS）光谱研究了碱性到亚碱性硅酸盐玻璃的大数据集上化学与纵向（或压力）声波传播之间的关系。结果表明，布里渊峰的频率fB随二氧化硅含量和二氧化硅与钙-氧化亚铁-氧化镁（SCFM）参数的增加而降低，而随非桥氧与四面体阳离子的比例（NBO/T）的聚合度的增加而增加。可以推断，fB和纵向弹性模量M′实部的值与参与硅酸盐网络的二价阳离子（M2+）的含量密切相关。我们的研究结果表明，碱土金属和Fe2+线性加速了硅酸盐玻璃中的纵向声波。这可能为利用BLS技术快速准确地测定地球和其他行星上天然玻璃的物理和化学性质打开了一扇新的窗口。

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来源期刊

Chemical Geology 地学-地球化学与地球物理

CiteScore

7.20

自引率

10.30%

发文量

374

审稿时长

3.6 months

期刊介绍： Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.