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Melt degassing by bubble nucleation and growth is a driving mechanism of magma ascent. Therefore, decompression experiments with hydrous silicate melts were used to investigate the onset and the dynamics of H 2 O degassing. Nominally H 2 O undersaturated trachytic Campi Flegrei and phonolitic Vesuvius melts representative for the magma compositions of the Campi Flegrei volcanic system were decompressed at a super-liquidus temperature of 1050 °C from 200 MPa to final pressures ( P  final ) of 100, 75, and 60 MPa using continuous decompression rates of 0.024 and 0.17 MPa/s. Experiments started from either massive glass cylinders or glass powder to demonstrate the infl of the starting material on melt degassing. Glass powder can be used to shorten the equilibration time ( t  eq ) prior to decompression for dissolution of H 2 O in the melt. The decompressed samples were quenched and compared in terms of bubble number density ( N  V ), porosity, and residual H 2 O content in the melt.

american mineralogist

Special Collection: Rates and Depths of Magma Ascent on Earth: Degassing of Hydrous Trachytic Campi Flegrei and Phonolitic Vesuvius Melts: Experimental Limitations and Chances to Study Homogeneous Bubble Nucleation