Experimental study of Fe^<3+> solubility in cristobalite and its application to a metamorphosed quartz-magnetite rock from Mt. Riiser-Larsen area, Napier Complex, East Antarctica

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著者

    • KAWASAKI Toshisuke
    • Department of Earth Sciences, Graduate School of Science and Engineering, Ehime University
    • ISHIZUKA Hideo
    • Department of Natural Environmental Study, Faculty of Science, Kochi University

抄録

</i>This report concerns the Fe<sup>3+</sup> solubility in cristobalite coexisting with hematite obtained from heating experiments in air at 990-1460 °C in the SiO<sub>2</sub>-Fe<sub>2</sub>O<sub>3</sub> system. The ferric iron substitutes for the tetrahedral silicon in cristobalite and Si<sup>4+</sup> also substitutes for the octahedral Fe<sup>3+</sup> in hematite. Combining the chemical and <i>P-T </i>data of the quartz in the high-pressure eclogite from Sanbagawa belt, central Shikoku, Japan with the present experimental data, we found the content of ferric iron in quartz increases with increasing pressure and temperature:<br><br>       ln<i>X</i><sub>Fe</sub> = (−1092 − 5.254<i>T </i>+ 7.75<i>P</i>)/<i>T</i>,<br><br>where <i>X</i><sub>Fe</sub>, <i>T </i>and <i>P </i>are the number of Fe atoms in quartz per formula unit based on a 2-oxygen atom normalization (cationic mole fraction of Fe), temperature in Kelvin and pressure in kbar, respectively. This new geothermometer is applied to the ultrahigh-temperature metamorphosed quartz-magnetite rock from Mt. Riiser-Larsen area, Napier Complex, East Antarctica, resulting that the metamorphic temperatures are estimated as about 994-1095 °C for pressures 5-15 kbar.

収録刊行物

  • Journal of mineralogical and petrological sciences  

    Journal of mineralogical and petrological sciences 103(4), 255-265, 2008-08-01 

    日本鉱物科学会

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各種コード

  • NII論文ID(NAID)
    10021369899
  • 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  J-STAGE 
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