Abstract
Our current understanding of silicate melt structure and volatile speciation initially was derived mostly from infrared absorption and Raman spectroscopic observation. This is, for example, the case for the importance of topological changes during densification up to ∼15GPa, the increase in coordination at higher pressures, and perhaps most strikingly, the speciation of volatiles in magmatic glasses and liquids. The picture that emerged from vibrational spectroscopy was later confirmed, and sometimes refined, by other techniques, but infrared and Raman spectroscopy remain two of the most informative and easily implemented analytical windows into the structure and volatile speciation of magmatic liquids, including in situ at high pressure and temperature.
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