Magma Plumbing System of the 2000 Eruption on Miyakejima Volcano, Japan

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  • GESHI Nobuo
    Earthquake Research Institute, University of Tokyo:(Present)Institute of Geoscience, National Institute of Advanced Industrial Science and Technology
  • SHIMANO Taketo
    Earthquake Research Institute, University of Toky
  • NAGAI Masashi
    Earthquake Research Institute, University of Toky
  • NAKADA Setsuya
    Earthquake Research Institute, University of Toky

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Other Title
  • 三宅島火山2000年噴火のマグマ供給系
  • ミヤケジマ カザン 2000ネン フンカ ノ マグマ キョウキュウケイ

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Abstract

Erupted magma of the 2000 eruption of the Miyakejima volcano changed from basaltic andesite to basalt during the caldera formation, from aphyric basaltic andesite with SiO2=54 wt.% to plagioclase-phyric basalt with SiO2=51.5 wt.%. Whole-rock compositions of the basaltic andesite of the June and July eruptions are plotted on the extension of the temporal variation of the previous eruptive materials, suggesting that the andesitic magma erupted in June and July eruptions were driven from the magma system worked for the last 500 years. Petrological character of the basalt in the eruptive materials of August, by contrast, is different from the previous lavas of the Miyakejima volcano. This shows that a new basaltic magma ascended to the shallow magma system after the caldera collapse. Identical ratio of the incompatible elements among the eruptive materials of the 2000 eruption and the recent eruptions suggests that they were driven from a common parental magma.

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