鉱物粒界の直視 -高分解能電子顕微鏡観察- Observation of Grain Boundries in Rocks by High-Resolution Transmission Electron Microscopy

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著者

    • 平賀 岳彦 HIRAGA Takehiko
    • 東北大学大学院理学研究科地学専攻地球物質科学 Institute of Mineralogy, Petrology, and Economic Geology, Graduate, School of Science, Tohoku University

抄録

Grain boundaries in metamorphic rocks were obsereved by high-resolution transmission electron microscopy. Most of the boundaries have no distinct secondary phases at a nanometer scale. Not only between the same kind of minerals but also between different minerals, mineral grains are directly connected at their boundaries, showing that the structual width of the grain boundaries is less than 0.5nm. Grain boundaries with spheroidal voids are observed in the boundaries. It can be concluded that this type of grain boundary is formed by the healing of microcracks. Low-index plane boundaries are well-developed, showing that this type of boundary has low grain boundary energy. Local structural modification, indicating the segregation of impurities, in grain boundaries is observed. The present results show that the actual width of the grain boundary in rocks is too small for the grain boundary diffusion to be as the dominant transport mechanism.

収録刊行物

  • 地學雜誌  

    地學雜誌 108(2), 110-121, 1999-04-25 

    Tokyo Geographical Society

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各種コード

  • NII論文ID(NAID)
    10002238876
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0022135X
  • NDL 記事登録ID
    4780767
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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