上部マントルにおける水の存在と超塩基性マグマの生成

• 井上 徹

  愛媛大学理学部地球科学教室

書誌事項

タイトル別名

• Existence of Water in the Earth's Upper Mantle and Generation of Ultrabasic Magma
• ジョウブ マントル ニ オケル ミズ ノ ソンザイ ト チョウ エンキセイ マ

抄録

The possible existence of water in the upper mantle and its implications to the generation of ultrabasic (komatiite) magma have been discussed on the basis of the recent melting experiments in the systems pyrolite+H₂O and Mg₂SiO₄ MgSiO₃-H₂O. The experiments demonstrated that presence of a certain amount of H₂O changes the melting temperatures, liquidus phases, and melt compositions in these system. No hydrous phases were observed near the solidus temperature below 12GPa, whereas hydrous modified spinel was found near the solidus temperatures at 15.5GPa. The maximum content of H₂O in this phase is estimated to be 3.3wt% from the microprobe analysis and crystallographic constraint. This suggests that a significant amount of H₂O can be accommodated in the mantle transition zone. The melting phase relations suggest that komatiite magmas can be generated in the hydrous mantle at about 200km depth.

収録刊行物

• 地震　第２輯

  地震　第２輯 48 (1), 167-175, 1995

  公益社団法人 日本地震学会

キーワード

• Melting relation
• Effect of H₂O
• Hydrous modified spinel
• Komatiite magma

詳細情報

• CRID: 1390282679283191296
• NII論文ID: 10006083504
• NII論文ID: 10004668717
• NII書誌ID: AN00305741
• DOI: 10.4294/zisin1948.48.1_167
• ISSN: 18839029
• ISSN: 2186599X
• ISSN: 00371114
• ISSN: http://id.crossref.org/issn/00371114
• NDL書誌ID: 3623766
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3623766
• Web Site: https://www.jstage.jst.go.jp/article/zisin1948/48/1/48_1_167/_pdf
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可