Petrologic evidence for pre-eruptive pressure-temperature conditions, and recent reheating, of andesitic magma erupting at the Soufriere Hills Volcano, Montserrat, W.I.

Details Petrologic evidence for pre-eruptive pressure-temperature conditions, and recent reheating, of andesitic magma erupting at the Soufriere Hills Volcano, Montserrat, W.I. Petrologic evidence for pre-eruptive pressure-temperature conditions, and recent reheating, of andesitic magma erupting at the Soufriere Hills Volcano, Montserrat, W.I.

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.3669d&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 19, p. 3669-3672

Physics

28

Volcanology

Scientific paper

The recent eruption of the Soufriere Hills Volcano in Montserrat (July, 1995, to present; September, 1997) has produced an andesitic dome (SiO2~59-61wt.%). The eruption has been caused by invasion of mafic magma into a preexisting andesitic magma storage region (P~130MPa >=5 km depth). The composition of the andesite has remained essentially constant throughout the eruption, but heating by the mafic magma increased the andesite temperature from <=830°C to <=880°C. Prior to being heated, the stable mineral assemblage in the andesite was plagioclase+amphibole+orthopyroxene+titanomagnetite+ilmenite+quartz. The rise in temperature from <=830°C to <=880°C (fO2~1log unit above NNO) has caused quartz to become unstable, and has also caused changes in silicate and Fe-Ti oxide mineral compositions. The andesitic magma is likely saturated with an H2O-rich vapor phase in the upper part of the magma storage region. Melt H2O content is ~4.7 wt.%.

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