Other
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3505m&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 23, p. 3505-3508
Other
13
Volcanology, Volcanology: Eruption Mechanisms
Scientific paper
We present a comprehensive experimental study of homogeneous bubble nucleation in rhyolitic magmas. It was undertaken by performing a series of isothermal (800°C) rapid decompression experiments using crystal-free rhyolitic liquids containing from 4 to 7 wt% H2O and various CO2 contents of up to 820 ppm. No homogeneous nucleation was observed in samples containing 4.5 wt% H2O and <120 ppm CO2 even at pressures of a few MPa. On the contrary, homogeneous nucleation occurred between 101 and 63 MPa in samples containing 4.5 wt% H2O plus 800 ppm CO2 and between 211 and 198 MPa in samples containing 7 wt% H2O plus 650 ppm CO2. Homogeneous nucleation produced a high number density (1013 to 1015m-3) of uniformly distributed, small and nearly equal-sized bubbles. Our experiments demonstrate that an event of homogeneous nucleation is possible in natural crystal-poor and volatile-rich rhyolitic magmas, that it may require supersaturation pressures much larger than previously anticipated (>150-200 MPa), and that the pressure of homogeneous nucleation will be strongly sensitive to the multicomponent volatile composition of the liquid.
Laporte Didier
Mourtada-Bonnefoi Catherine C.
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