Mathematics – Logic
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.3673d&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 19, p. 3673-3676
Mathematics
Logic
16
Volcanology
Scientific paper
The recent eruption of the Soufriere Hills Volcano in Montserrat (July, 1995, to present; October, 1997) has produced a hornblende-bearing, andesitic lava dome. It is possible to petrologically estimate changes in ascent rates of amphibole-bearing magmas. For certain rates of decompression, a breakdown rim of fine-grained, anhydrous reaction products forms where amphibole is in contact with melt. The thickness of the rim varies with ascent rate. Most of the amphibole phenocrysts in the magma storage region lack breakdown rims. About 10% have 200-400 μm-thick, coarse-grained breakdown rims that are interpreted to be relicts of a past heating event. Study of a time series of new dome andesites showed that ascent rate increased from December, 1995 (~0.001 m/s), to July, 1996 (~0.008 m/s), while eruptive style remained extrusive. Ascent rate increased to >0.012 m/s in August, 1996, and the first major explosive eruption occurred on 17-18 September, 1996.
Devine Joseph D.
Gardner James E.
Rutherford Malcolm J.
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