磐梯火山の地質と火山活動史 - 火山灰編年法を用いた火山活動の解析 - Geology and growth history of Bandai volcano, Tohoku-Honshu arc, Japan - Analysis of volcanic activity by tephrochronology -

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Bandai volcano is located in the southern part of Tohoku-Honshu arc, Japan, and has been active from about 300 ka. Most recently, the volcano erupted in 1888 and the phreatic eruption caused volcanic body collapse and produced huge debris avalanche deposit. Here we present new data of the tephrochronology and volcanic geology of Bandai volcano and discuss its growth history. The tephra-loam association in this area consists of the Hayama and the Mineyama Loam Formations. Sixty-three layers of tephra are recognized in the Mineyama Loam Formation, and seventy-seven layers of tephra in the Hayama Loam Formation. The volcanic activity is classified into seven stages based on tephrochronology: Stage 1: 300 ka≤(presumed age), Stage 2: 300-280 ka, Stage 3: 250-230 ka, Stage 4: 170-85 ka, Stage 5: 75-57 ka, Stage 6: 36-28 ka, Stage 7: 24-0 ka. Pyroxene andesite lavas and tephras are eruptions of Bandai volcano throughout its activity, and more than 13 large avalanche deposits are found in Stages 2, 5, 6, and 7 including 1888 debris avalanche. Modes of eruptions were almost sub-plinian with lava effusions from Stages 2 to 3, whereas sub-plinian was subsequently followed by vulcanian with lava effusions from Stages 5 to 7. Sub-plinian eruptions occurred in the earliest phase of Stages 5, 6, and pumice falls with occasional pumice flows were associated. Stage 4 consists of two eruption types. Large debris avalanches were commonly produced related with the sub-plinian eruption, except for 1888 eruption. Bandai volcano is a complex of at least five stratocones, and resurge of volcanic activity caused collapse of pre-existed volcanic body. This cyclic feature is considered to be the behavior of the volcano.

収録刊行物

  • 岩石鉱物科学

    岩石鉱物科学 30(3), 126-156, 2001-05-30

    一般社団法人 日本鉱物科学会

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各種コード

  • NII論文ID(NAID)
    10006211543
  • NII書誌ID(NCID)
    AA1146088X
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    1345630X
  • NDL 記事登録ID
    5842711
  • NDL 雑誌分類
    ZM46(科学技術--地球科学--岩石・鉱物・鉱床)
  • NDL 請求記号
    Z15-117
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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