Volcanic eruptions from ghost magma chambers

Details Volcanic eruptions from ghost magma chambers Volcanic eruptions from ghost magma chambers

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3516304t&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 16, CiteID L16304

Physics

1

Geochemistry: Magma Chamber Processes (3618), Volcanology: Experimental Volcanism, Volcanology: Physics And Chemistry Of Magma Bodies, Geochemistry: Reactions And Phase Equilibria (3612, 8412)

Scientific paper

Recent studies have proposed that magma reservoirs crystallized to a virtually rigid crystal-mush can be partially remelted by diffusion of hot fluids. We show that for a crystal mush with the composition of a K-trachyte from the Campanian Ignimbrite (CI) Eruption, remelting can occur without a significant increase of the magma temperature, but simply by diffusion of H2O by the magmatic gases feeding the system. The CI origin is not the issue here, but rather the chemical and physical behavior of an almost solidified magma mass left over in a reservoir after a major eruption. To test our hypothesis, we run high pressure/high temperature laboratory experiments to study the kinetics of water diffusion, together with thermodynamics and fluid diffusion modelling. For small diffusivities, or large diffusion time, the remelting mechanism proposed above needs to be replaced by other processes as gas percolation or intrusion of a magmatic mass.

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