Journal
GEOLOGY
Volume 38, Issue 3, Pages 195-198Publisher
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G30350.1
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- Grants-in-Aid for Scientific Research [21710182] Funding Source: KAKEN
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Feeder dikes bring magma to the surface; non-feeder dikes become arrested and never reach the surface. The differences, if any, between these dike types remain largely unexplored because in the field it is normally unknown if a particular dike is a feeder or non-feeder. Here we present measurements of feeder and non-feeder dikes exposed from depths of >200 m to the surface in the walls of the A. D. 2000 caldera collapse of the Miyakejima Volcano, Japan. A typical feeder thickness reaches a maximum of 2-4 m at the surface, decreases rapidly to similar to 1 m at a depth of 20-40 m, and then remains constant to the bottom of the exposure. By contrast, a typical non-feeder thickness reaches a maximum of 1.5-2 m at 15-45 m below the tip, and then decreases slowly with depth to 0.5-1 m at the bottom of the exposure. We propose that free-surface effects and magmatic overpressure (driving pressure) changes during the eruption cause the overall shape of a feeder to differ from that of a non-feeder.
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