Bubble nucleation growth rates o n c e it b e g in s n

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Unformatted text preview: c le a tio n w ill o c c u r a t r a te : 3 J ! D exp(" 16#$ ) 3RT ! P 2 Leads to strong exponential dependence on supersaturation G r o w th & n u c le a tio n r a te s a ls o p r o p o r tio n a l to d iffu s io n c o e ffic ie n t, D , a n d h e n c e c a n b e lim ite d b y d iffu s io n o f g a s to b u b b le s u r fa c e Diffusion rates related to viscosity, so bubble growth is more likely to be diffusion limited in silicic lavas than in basic ones. 12 Effect of Bubbles F o r m a tio n o f b u b b le s r e d u c e s th e d e n s ity o f th e m a g m a , in c r e a s in g it b u o y a n c y a n d th e fo r c e e x e r te d o n o v e r ly in g r o c k . The effect is to drive the magma upward, increasing chances of eruption. Rising magma experiences decreasing pressure, leading to more exsolution, etc. K e y fa c to r s fo r e r u p tiv e s ty le : Can bubbles rise through the magma? Leads to non-Plinian eruptions if yes. Can bubbles coalesce? Leads to Strombolian eruptions if yes. Depends o...
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This document was uploaded on 03/04/2014 for the course EAS 458 at Cornell University (Engineering School).

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