阿蘇カルデラ形成後に活動した多様なマグマとそれらの成因関係について Genetic Relationships of the Compositionally Diverse Magmas from Aso Post-caldera Volcanism

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Between 270 and 90ka, Aso volcano produced four large caldera-forming pyroclastic flows, all of which probably derived from a single zoned magma chamber, as suggested by previous geological and geochemical studies. On the other hand, after 90ka, for the post-caldera activities, it is difficult to create a wide compositional range of post-caldera magmas from a single magma chamber model, when the following observations are considered. (1) Seven distinct magma groups with distinct petrographic and compositional characteristics are found; I. 2px-rhyolite, II. bt-rhyolite, III. hb-dacite, IV. 2px-dacite, V. aphyric andesite, VI. porphyritic andesite, VII. basalt-basaltic andesite. (2) Incompatible trace element plots show that the seven magma groups were formed by at least four end-member magmas that do not show parent-daughter relationships. (3) Vents extruding basaltic magmas are centered in the caldera, whereas those extruding andesitic, dacitic, and rhyolitic magmas are distributed around them. These observations indicate that several (at least four) magma chambers are developed during the post-caldera activities, and that the compositional diversity of the magmas can be explained by magma mixing among the end-member magmas in addition to fractional crystallization.

収録刊行物

  • 火山

    火山 50(5), 269-283, 2005

    特定非営利活動法人 日本火山学会

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  • NII論文ID(NAID)
    110003498077
  • NII書誌ID(NCID)
    AN10512786
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0453-4360
  • NDL 記事登録ID
    7737711
  • NDL 雑誌分類
    ZM44(科学技術--地球科学--海洋・陸水・火山)
  • NDL 請求記号
    Z15-101
  • データ提供元
    CJP書誌  CJP引用  NDL  NII-ELS  J-STAGE 
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