Physics
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3514302k&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 14, CiteID L14302
Physics
2
Volcanology: Magma Migration And Fragmentation, Volcanology: Experimental Volcanism, Volcanology: Explosive Volcanism
Scientific paper
Brittle fragmentation was examined in a vesicular material analogous to magma, in this case, maltose syrup with bubbles. All the key time scales for magma fragmentation are controlled in the experiment using a rapid decompression facility. It was found that the onset of fragmentation can be well characterized using the Maxwell relaxation time τ r and the decompression time Δt dec, in the case where sufficiently large stress is generated in the material. As the ratio Δt dec/τ r increases from less than unity to over fifty, the response of the specimen changes from brittle fragmentation to ductile expansion without fragmentation. During the transition, the specimen exhibits small ductile deformation before the onset of fragmentation. The transition occurs even though the stress at the bubble wall is the same. The results suggest that Δt dec/τ r is the controlling parameter not only for the onset of, but also for the variation of magma fragmentation by decompression.
Ichihara Mie
Kameda Masaharu
Kuribara Hideaki
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