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Fluids exsolved from mafic melts are thought to be dominantly CO 2 -H 2 O ± S fluids. Curiously, although CO 2  vapor occurs in bubbles of mafic melt inclusions (MI) at room temperature ( T ), the expected accompanying vapor and liquid H 2 O have not been found. We reheated olivine-hosted MI from Mt. Somma-Vesuvius, Italy, and quenched the MI to a bubble-bearing glassy state. Using Raman spectroscopy, we show that the volatiles exsolved after quenching include liquid H 2 O at room  T  and vapor H 2 O at 150 °C. We hypothesize that H 2 O initially present in the MI bubbles was lost to adjacent glass during local, sub-micrometer-scale devitrification prior to sample collection. During MI heating experiments, the H 2 O is redissolved into the vapor in the bubble, where it remains after quenching, at least on the relatively short time scales of our observations. These results indicate that (1) a significant amount of H 2 O may be stored in the vapor bubble of bubble-bearing MI and (2) the composition of magmatic fluids directly exsolving from mafic melts at Mt. Somma-Vesuvius may contain up to 29 wt% H 2 O.

Detection of liquid H 2 O in vapor bubbles in reheated melt inclusions: implications for magmatic fluid composition and volatile budgets of magmas?