リチウムの地球・宇宙化学　Ｌｉ同位体のトレーサーとしての可能性と課題

• 森口 拓弥

  岡山大学地球内部研究センター

• 中村 栄三

  岡山大学地球内部研究センター

• 石川 剛志

  岡山大学地球内部研究センター Department of Terrestrial Magnetism, Carnegie Institution of Washington

書誌事項

タイトル別名

• Geochemistry and cosmochemistry of lithium. Utility of the Li isotopes as a geochemical tracer.
• リチウム ノ チキュウ ウチュウ カガク Li ドウイタイ ノ トレーサ -
• Utility of the Li isotopes as a geochemical tracer
• Li同位体のトレーサーとしての可能性と課題

抄録

Geochemical and cosmochemical studies on lithium are reviewed and the potential of lithium isotope systematics as a geological tracer is discussed in this article.<br> Lithium, the smallest of the alkaline elements, possesses two stable isotopes, ⁶Li and ⁷Li. It also displays the following unique physicochemical characteristics: (1) an extremely high cross-section of the lithium isotope ⁶Li for thermal neutrons; (2) high incompatibility in the mafic silicate minerals in the magmatic processes; (3) high solubility in fluid phases; and (4) large isotopic variations in the ⁶Li/⁷Li ratio of natural samples exceeding 30‰. The content and isotopic composition of lithium in meteoritic and terrestrial materials may provide important clues <br>to understanding nucleosynthesis theories and many geological phenomena including water/rock interactions, metamorphic and magmatic processes.<br> However, the isotopic behavior of lithium in geologic processes is still not well understood, since only a few reliable isotopic measurements of lithium are available for natural samples due essentially to analytical difficulties; derived from the extremely large mass difference between the two isotopes and no internally-derived correction for the mass fractionation in mass spectrometry. In order to apply lithium isotope systematics for understanding geochemical and water-related processes in the Earth and other planets, the development of a high precision technique for lithium isotope analysis is urgently required so as to accumulate the much needed fundamental data set of natural samples.

収録刊行物

• 岩鉱

  岩鉱 88 (9), 415-431, 1993

  一般社団法人　日本鉱物科学会

キーワード

• Lithium contents
• Lithium isotopes
• Geochemistry
• Cosmochemistry
• Geological tracer
• Incompatibility
• Solubility
• Thermal neutron

詳細情報

• CRID: 1390282681191631872
• NII論文ID: 130003884783
• NII論文ID: 40004731609
• NII書誌ID: AN10047992
• DOI: 10.2465/ganko.88.415
• COI: 1:CAS:528:DyaK2cXlvVKqtQ%3D%3D
• ISSN: 18813275
• ISSN: 09149783
• ISSN: http://id.crossref.org/issn/09149783
• NDL書誌ID: 3847776
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3847776
• 本文言語コード: ja
• 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