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Recent phase equilibrium studies, combined with analytical and petrological data, provide rigorous constraints on the pre-eruptive P-T-fH20-fO2-fS2-fCO2 conditions of silicic to mafic arc magmas. Pre-eruptive melts show a broad negative correlation between temperature and melt H2O contents. Pre-eruptive melt S contents cluster around 100 ppm in residual rhyolitic liquids of silicic to andesitic magmas, and range up to 5000 ppm in more mafic ones. For the entire compositional spectrum, melt sulphur contents are almost independent of prevailing fO2. In contrast,...

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