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.
Bersani, D., Ando', S., Vignola, P., Marino, I., Lottici, P., Gucsik, A. (2009). Micro-Raman Determination of the Composition of Ugrandite Garnets. In A. Gucsik (a cura di), Micro-Raman Spectroscopy And Luminescence Studies In The Earth And Planetary Sciences. International Conference on Micro-Raman. Mainz, Germany, Apr 02, 2009 (pp. 35-43). AIP [10.1063/1.3222891].
Micro-Raman Determination of the Composition of Ugrandite Garnets
ANDO', SERGIOSecondo
;
2009
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.
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