A fast method to obtain the molar composition of garnets starting from their Raman spectra was recently proposed. The method, called MIRAGEM - MIcro-RAman Garnets Evaluation Method is based on the assumption that in a garnet solid-solution the Raman wavenumbers are linear combinations of end-member wavenumbers, weighted by their molar fraction. In this work, the application of the MIRAGEM method to garnets belonging to the ugrandite family is discussed in detail, showing very good correspondence with electron-microscope-microprobe results in the grossular-andradite series. Unexpected two-mode behavior of a Raman peak in garnets with large amount of uvarovite is found.
Micro-Raman Determination of the Composition of Ugrandite Garnets / Bersani, Danilo; Ando', S; Vignola, P; Marino, Iari Gabriel; Lottici, Pier Paolo. - In: AIP CONFERENCE PROCEEDINGS. - ISSN 0094-243X. - ELETTRONICO. - 1163:(2009), pp. 35-43. (Intervento presentato al convegno International Conference on Micro-Raman Spectroscopy and Luminescence Studies in the Earth and Planetary Sciences tenutosi a Mainz, GERMANY nel APR 02, 2009) [10.1063/1.3222891].
Micro-Raman Determination of the Composition of Ugrandite Garnets
BERSANI, Danilo;MARINO, Iari Gabriel;LOTTICI, Pier Paolo
2009-01-01
Abstract
A fast method to obtain the molar composition of garnets starting from their Raman spectra was recently proposed. The method, called MIRAGEM - MIcro-RAman Garnets Evaluation Method is based on the assumption that in a garnet solid-solution the Raman wavenumbers are linear combinations of end-member wavenumbers, weighted by their molar fraction. In this work, the application of the MIRAGEM method to garnets belonging to the ugrandite family is discussed in detail, showing very good correspondence with electron-microscope-microprobe results in the grossular-andradite series. Unexpected two-mode behavior of a Raman peak in garnets with large amount of uvarovite is found.| File | Dimensione | Formato | |
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