The importance of magma degassing and separation of magmatic fluids (aqueous as well as other components) has been recognized in many geologic observations at least since Niggli (1912; see also Morey and Niggli 1913; Bowen 1928; Morey 1957). Improved analytical techniques in recent years have permitted micron scale examination of melt and fluid inclusions inside magmatic minerals. In these inclusions, concentrated aqueous solutions and extreme enrichment of melts and fluids in volatile components (S, CO2, B2O3, Cl, F, and metals) have been observed (Roedder 1992; Webster 1997;...

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