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A semi-quantitative technique for determination of CO₂ in cordierite by Raman spectroscopy in thin sections

Faculty of Geo- and Atmospheric Sciences, Institute of Mineralogy and Petrography, University of Innsbruck, Innrain 52, A-6020 Innsbruck, Austria

^* Corresponding author, e-mail: reinhard.kaindl{at}uibk.ac.at

Confocal micro-Raman spectroscopic measurements at high spatial resolution of about 5 µm³ were performed to determine the CO₂ contents of natural cordierite. Nine cordierite single-crystals with known CO₂ concentrations, previously determined by colorimetric titration, were studied to obtain a calibration curve for this method. Measurements were also performed to quantify the CO₂ content of cordierite porphyroblasts in a thin section of a granulite-facies metapelite from Kösseldorf, Sauwald Area, Southern Bohemian Massif, Upper Austria. Fifteen points along a traverse through a large (560 µm) single crystal revealed low CO₂ contents of 0.14 ± 0.11 wt.% CO₂. These results provide some constraints on the activity of CO₂ [a(CO₂)] during granulite-facies metamorphism, only if fluid-saturated conditions prevailed or independent H₂O measurements were made.

Key-words: Raman spectroscopy, cordierite, CO₂, thin section, Bohemian Massif, Sauwald.