Differentiation of muscovites in igneous and metamorphic rocks according to their Raman spectra

Authors : Musa Avni Akçe, Yusuf Kagan Kadıoğlu
Pages : 1431-1438
Doi:10.65206/pajes.82826
View : 66 | Download : 102
Publication Date : 2025-12-17
Article Type : Research Paper
Abstract :Muscovite is a dioctahedral mica mineral belonging to the phyllosilicates, also known as sheet silicates. It is also referred to as white mica; muscovites can be found in all major rock groups, including igneous, metamorphic, and sedimentary rocks. Muscovites, which are common in igneous rocks, especially in S-type granites and pegmatitic rocks, are also present in varying proportions within metamorphic rocks composed of schist and gneiss in the greenschist facies. Phyllosilicates, one of the main types of silicates, possess variable structures and complex chemistries. Due to these structural and compositional differences, the Raman shifts of phyllosilicates can be observed in different spectral regions. Furthermore, variations in the crystallization processes of magma and differences in the pressure-temperature conditions during metamorphism affect the intensity and wavenumber of their Raman spectra. In this study, the Raman spectra of muscovites of both igneous and metamorphic origins were compared, and the differences in their Raman spectra, including peak shifts, were analyzed to elucidate the distinctions between them. There are shifts in the Raman spectra of muscovites due to differences in pressure and temperature. The peak shifts, which typically develop in metamorphic rocks, occur due to the effects of temperature and, especially, pressure. In addition, it is known that peak shifts are also related to the content of elements such as Si and Al in muscovites. It is thought that metamorphic muscovites have undergone preferential orientation due to the pressure acting during metamorphism, and therefore, the peak intensity has increased, and the band width has increased due to structural defects arising from foliation developed as a result of the pressure during metamorphism. The results of this study demonstrate that the origin of muscovites and the rock types to which they belong can be identified by utilising Raman spectra.
Keywords : Raman spektroskopisi, Muskovit, S-tipi granitler, Yeşilşist fasiyesi kayaları

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