Silicon-substituted magnetite and accompanying iron oxides and hydroxides from the Kumano mine, Yamaguchi Prefecture, Japan : Reexamination of the so-called maghemite (γ-Fe_2O_3)

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著者

    • OHKAWA Makio
    • Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University
    • MIYAHARA Masaaki
    • Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University
    • OHTA Eri
    • Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University
    • HOSHINO Kenichi
    • Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University

抄録

Iron oxides and hydroxides found in the so-called maghemite-bearing iron oxide ores from the Kumano mine, Yamaguchi Prefecture, Japan have been investigated using polarizing microscopy, reflecting microscopy, powder X-ray diffractometry (XRD), and electron probe microanalysis (EPMA) to reevaluate the previous study carried out by Shibuya (1958).<br>     </i>The results show that the iron oxide described as maghemite by Shibuya is actually magnetite, showing a compositional zoning of Si with trace amounts of Al and Ca, and that only hematite and goethite are found as alteration products. The compositional zoning of the magnetite may indicate that the silicon-bearing magnetite was formed during reducing conditions.<br>     The <i>a</i> lattice parameter of <i>a</i> = 8.376(1) Å for the silicon-bearing magnetite is shorter than that of normal magnetite. This contraction in the crystal lattice is probably caused by a coupled substitution: Si<sup>4+</sup> for Fe<sup>3+</sup> on the tetrahedral sites and a divalent cation (mainly Fe<sup>2+</sup>) for Fe<sup>3+</sup> on the octahedral sites, with a simple substitution of Al<sup>3+</sup> for Fe<sup>3+</sup> on the tetrahedral sites.

収録刊行物

  • Journal of mineralogical and petrological sciences

    Journal of mineralogical and petrological sciences 102(3), 182-193, 2007-06-01

    日本鉱物科学会

参考文献:  12件中 1-12件 を表示

被引用文献:  1件中 1-1件 を表示

各種コード

  • NII論文ID(NAID)
    10018921766
  • NII書誌ID(NCID)
    AA11460926
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13456296
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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