THE OCCURRENCE AND STRUCTURE OF VERMIFORM CHLORITE

• KAMEDA JUN

  Department of Earth and Planetary Science, The University of Tokyo

• OKAMOTO ATSUSHI

  Graduate School of Environmental Studies, Tohoku University

• MIKOUCHI TAKASHI

  Department of Earth and Planetary Science, The University of Tokyo

• KITAGAWA RYUJI

  Department of Earth and Planetary System Science, Hiroshima University

• KOGURE TOSHIHIRO

  Department of Earth and Planetary Science, The University of Tokyo

抄録

To understand the origin of its unique morphology, the structure of vermiform chlorite has been investigated. Two chlorite specimens (magnesian chamosite) were analyzed: vermicular aggregates in quartz-feldspar veins in a pelitic schist, and those grown on a quartz single-crystal surface. Both specimens show very similar textures; they are composed of pseudohexagonal chlorite plates of several tens μm in lateral size and several hundreds nm in packet thickness, stacked to form long vermicular aggregates up to several hundreds μm. Chemical analyses indicated that the two specimens have similar compositions with ^<IV>Al 1.2〜1.3 per 4.0 sites and Fe/(Mg+Fe) ratio of 〜0.55. XRD and EBSD indicate IIbb semi-random stacking. HRTEM shows that the stacking is considerably disordered in terms both of the layer orientation and direction of the interlayer displacement. The vermicular morphology of chlorite is probably originated from a relatively faster spiral growth along the stacking in hydrothermal fluid.

収録刊行物

• Ｃｌａｙ　Ｓｃｉｅｎｃｅ

  Ｃｌａｙ　Ｓｃｉｅｎｃｅ 14 (4), 155-161, 2010

  一般社団法人 日本粘土学会

キーワード

• Vermiform
• Chlorite
• Polytype
• TEM

詳細情報

• CRID: 1390282679088102144
• NII論文ID: 110007641851
• NII書誌ID: AA00607148
• DOI: 10.11362/jcssjclayscience.14.4_155
• ISSN: 21863555
• ISSN: 00098574
• 本文言語コード: en
• データソース種別:
  • JaLC
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可