Experimental constraints on volatile abundances in arc magmas and their implications for degassing processes
Published:January 01, 2003
B. Scaillet, M. Pichavant, 2003. "Experimental constraints on volatile abundances in arc magmas and their implications for degassing processes", Volcanic Degassing, C. Oppenheimer, D. M. Pyle, J. Barclay
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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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Humans have long marvelled at (and feared) the odorous and colourful manifestations of volcanic emissions, and, in some cases, have harnessed them for their economic value. The degassing process responsible for these phenomena is now understood to be one of the key factors influencing the timing and nature of volcanic eruptions. Moreover the surface emissions of these volatiles can have profound effects on the atmospheric and terrestrial environment, and climate. Even more fundamental are the relationships between the history of planetary outgassing, differentiation of the Earth’s interior, chemistry of the atmosphere and hydrosphere, and the origin and evolution of life. This book provides a compilation of 23 papers that investigate the behaviour of volatiles in magma, the feedbacks between degassing and magma dynamics, and the composition, flux, and environmental, atmospheric and climatic impacts of volcanic gas emissions.