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Geometric difference between non-feeder and feeder dikes

Nobuo Geshi, Shigekazu Kusumoto and Agust Gudmundsson
Geometric difference between non-feeder and feeder dikes
Geology (Boulder) (March 2010) 38 (3): 195-198


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 approximately 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.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 38
Serial Issue: 3
Title: Geometric difference between non-feeder and feeder dikes
Affiliation: National Institute of Advanced Industrial Science and Technology, Geological Survey of Japan, Ibaraki, Japan
Pages: 195-198
Published: 201003
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 18
Accession Number: 2010-030918
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2010055
Illustration Description: illus. incl. sketch map
N34°04'60" - N34°10'00", E139°28'00" - E139°31'60"
Secondary Affiliation: University of Toyama, JPN, JapanRoyal Holloway University of London, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201018
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