阿蘇カルデラ西部に分布する栃ノ木溶岩中にみられる組成不均質とその成因 Origin of compositional heterogeneity within Tochinoki andesitic lava flow from the western part of Aso caldera

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A composite lava flow is found in core samples of Tochinoki lava unit, one of the post-caldera volcanic products distributed in the western part of Aso caldera. Including core and surface outcrop samples, Tochinoki lava shows two compositionally different lava types. One is silicic (SiO<sub>2</sub> 63-66 wt%) and phenocryst-rich (8-16 vol%), and the other is mafic (SiO<sub>2</sub> 60-62 wt%) and phenocryst-poor (< 7 vol%). Mass balance calculation and trace element modeling show that the compositional variation found among Tochinoki core samples are explained by the fractional crystallization of plagioclase, clinopyroxene, orthopyroxene and magnetite phenocrysts from the most mafic lava. Tochinoki composite lava flow is probably produced by the viscous segregation of compositionally distinct magmas ascending simultaneously in the conduit as proposed by Inyo Obsidian Dome drilling project. Bulk rock composition and mineral chemistry indicate that mafic-silicic pairs observed in Tochinoki core samples are different from those in outcrop samples. This difference probably suggests the existence of contemporaneous multiple flow units in the Tochinoki lava unit.

収録刊行物

  • 岩石鉱物科学  

    岩石鉱物科学 36(1), 15-29, 2007-01-30 

    日本鉱物科学会

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各種コード

  • NII論文ID(NAID)
    10018411390
  • 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
    8757501
  • 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  NDL  J-STAGE 
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