Geometric difference between non-feeder and feeder dikes

Abstract

Research Article| March 01, 2010 Geometric difference between non-feeder and feeder dikes Nobuo Geshi; Nobuo Geshi 1Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan Search for other works by this author on: GSW Google Scholar Shigekazu Kusumoto; Shigekazu Kusumoto 2Graduate School of Science and Engineering for Research, University of Toyama, 3190 Gofuku, Toyama-shi, Toyama 930-8555, Japan Search for other works by this author on: GSW Google Scholar Agust Gudmundsson Agust Gudmundsson 3Department of Earth Sciences, Queen's Building, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK Search for other works by this author on: GSW Google Scholar Geology (2010) 38 (3): 195–198. https://doi.org/10.1130/G30350.1 Article history received: 29 Apr 2009 rev-recd: 07 Jul 2009 accepted: 18 Sep 2009 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Nobuo Geshi, Shigekazu Kusumoto, Agust Gudmundsson; Geometric difference between non-feeder and feeder dikes. Geology 2010;; 38 (3): 195–198. doi: https://doi.org/10.1130/G30350.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract 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 ∼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. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.