Experimental study of Fe3+ solubility in cristobalite and its application to a metamorphosed quartz-magnetite rock from Mt. Riiser-Larsen area, Napier Complex, East Antarctica

• 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 Fe³⁺ solubility in cristobalite coexisting with hematite obtained from heating experiments in air at 990-1460 °C in the SiO₂-Fe₂O₃ system. The ferric iron substitutes for the tetrahedral silicon in cristobalite and Si⁴⁺ also substitutes for the octahedral Fe³⁺ in hematite. Combining the chemical and P-T 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>       lnX_Fe = (−1092 − 5.254T + 7.75P)/T,<br><br>where X_Fe, T and P 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

  一般社団法人　日本鉱物科学会

キーワード

• Fe³⁺ solubility in quartz
• Cristobalite
• Hematite
• Magnetite
• Meta-Qtz-Mt rocks
• Ultrahigh-temperature granulite
• Napier Complex
• East Antarctica
• Quartz eclogite

詳細情報

• CRID: 1390282681523511040
• NII論文ID: 10021369899
• NII書誌ID: AA11460926
• DOI: 10.2465/jmps.080216
• ISSN: 13493825
• ISSN: 13456296
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可