火山フロント下, 上部マントルの岩石学的・化学的特徴 Petrological and geochemical features of the upper mantle beneath a volcanic front

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著者

    • 石丸 聡子 ISHIMARU Satoko
    • 熊本大学大学院自然科学研究科理学専攻地球環境科学講座 Department of Earth and Environmental Sciences, Graduate School of Science and Technology, Kumamoto University

抄録

  Peridotite xenoliths derived from the upper mantle give us important information about partial melting and subsequent modification processes, i.e., mantle metasomatism. We examined a large number of mantle peridotite xenoliths from Avacha volcano, located on the volcanic front of southern Kamchatka arc, to reveal that they are residues of high degree of mantle melting and experienced extensive silica addition. We inferred that the slab-derived fluids are closely related with both of the processes, and the degrees of melt extraction and silica addition to the mantle wedge tend to decrease with an increase of the distance from the trench. In addition, we found several new mantle metasomatic events recorded in the Avacha peridotite xenoliths: e.g., the mantle reduction and Ni metasomatism. We consider such peculiar metasomatisms are possibly specific to the sub-frontal mantle, although detailed petrological features and metasomatic processes from other volcanic front regions have not been fully understood due to the paucity of mantle peridotite xenoliths there. More thorough research about the petrological nature of sub-arc mantle and the mantle processes is needed for complete understanding of sub-arc mantle and its metasomatism by slab-derived fluids or melts.<br>

収録刊行物

  • 岩石鉱物科学

    岩石鉱物科学 41(1), 19-25, 2012-01-30

    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)
    10030121986
  • NII書誌ID(NCID)
    AA1146088X
  • 本文言語コード
    JPN
  • 資料種別
    REV
  • ISSN
    1345630X
  • NDL 記事登録ID
    023574879
  • NDL 請求記号
    Z15-117
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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