HR: 0830h
AN: V51E-0326    [PDF]
TI: The Role of Magma Mingling in Strombolian Explosions: an Example From September-October 2002
AU: * Lautze, N C
EM: nlautze@soest.hawaii.edu
AF: University of Hawaii, Manoa, 1680 East-West Rd. 606A, Honolulu, HI 96822 United States
AU: Houghton, B F
EM: bhought@soest.hawaii.edu
AF: University of Hawaii, Manoa, 1680 East-West Rd. 606A, Honolulu, HI 96822 United States
AB: Unusual eruptive conditions during September-October 2002 permitted us to collect clast populations ejected during single explosions and closely spaced series of explosions at Stromboli volcano. The clast populations have a range of textures and vesicularites suggesting melt resident in the shallow conduit was a mixture of rising, actively vesiculating magma, and material that had stagnated and partially outgassed in this environment. Explosions ejected clasts composed of either type of melt independently, in addition to clasts formed from mingling of both the freshly arrived and long resident magmas. We use measurements of vesicle size and shape to constrain the vesiculation and degassing processes, and to look at the influence of the long resident melt on the eruption process.
DE: 8400 VOLCANOLOGY
DE: 8414 Eruption mechanisms
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2003 Fall Meeting