Immiscibility of the grossular-spessartine series under a water pressure of 100 MPa.

• SHOJI Tetsuya

  Department of Geosystem Engineering, School of Engineering, The University of Tokyo

• TSUKADA Hiroko

  Institute of Earth Science, School of Education, Waseda University

• MARIKO Tadashi

  Institute of Earth Science, School of Education, Waseda University

• KANEDA Hiroaki

  Department of Geosystem Engineering, School of Engineering, The University of Tokyo

抄録

Electron microprobe analysis of grossular-spessartine garnets hydrothermally synthesized from glass at 300–700°C shows that the composition is continuous above 490°C. Below this temperature there is a compositional gap between 70 and 96 mol % spessartine at 480°C and between 55 and 97 mol % at 450°C. The gap extends up to 36 mol % spessartine at 400°C and up to 30 mol % at 300°C on the grossular side, but is not clear on the spessartine side because of the fO₂ unbuffered experiments. Hydrothermal treatment of garnet-anorthite-tephroite mixture with bulk composition of Gr_33.3 Sp_66.7 shows that garnet grows above 430°C, and that no change is recognized at 400°C. These facts indicate that garnet of the grossular-spessartine series forms a complete solid solution above 490°C, and shows a certain indication that they exsolve to Ca-rich and Mn-rich garnets at lower temperatures. The additional experiments indicate that below 415°C the tie-line connecting the two garnets is replaced by the one connecting anorthite and tephroite in the system CaO–MnO–Al₂O₃–SiO₂.

収録刊行物

• Ｍｉｎｅｒａｌｏｇｉｃａｌ　Ｊｏｕｒｎａｌ

  Ｍｉｎｅｒａｌｏｇｉｃａｌ　Ｊｏｕｒｎａｌ 17 (7), 313-321, 1995

  一般社団法人　日本鉱物科学会

キーワード

• General Earth and Planetary Sciences
• General Environmental Science

詳細情報

• CRID: 1390001206545997952
• NII論文ID: 10008771242
• NII書誌ID: AA00739590
• DOI: 10.2465/minerj.17.313
• ISSN: 18814174
• ISSN: 05442540
• ISSN: http://id.crossref.org/issn/05442540
• 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