火山フロント下,上部マントルの岩石学的・化学的特徴

  • 石丸 聡子
    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

書誌事項

タイトル別名
  • Petrological and geochemical features of the upper mantle beneath a volcanic front
  • 日本鉱物科学会研究奨励賞第8回受賞者 受賞記念研究紹介 火山フロント下,上部マントルの岩石学的・化学的特徴
  • ニホン コウブツ カガクカイ ケンキュウ ショウレイショウ ダイ8カイ ジュショウシャ ジュショウ キネン ケンキュウ ショウカイ カザン フロント カ,ジョウブ マントル ノ ガンセキガクテキ ・ カガクテキ トクチョウ

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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

    一般社団法人 日本鉱物科学会

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