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Fig. 8 | Progress in Earth and Planetary Science

Fig. 8

From: Mass transfer in the Earth’s interior: fluid-melt interaction in aluminosilicate–C–O–H–N systems at high pressure and temperature under oxidizing conditions

Fig. 8

Example of Raman spectra of silicate–C–O–H–N fluid and melt at 625° and 750 °C, respectively, fitted to Gaussian lines in the 950–1150 cm−1 frequency range. a Spectra from fluid with a single line assigned to C–O vibrations in CO3 groups. b Spectra from melts where three lines are needed. These are assigned to C–O stretching in HCO3- and CO32- groups and to Si–O stretching in Q3 silicate species (see text for discussion on these assignments)

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