岩石学における非平衡過程の速度論的研究

• 西山 忠男

  熊本大学先端科学研究部理学系地球環境科学講座

書誌事項

タイトル別名

• Kinetic study on the non-equilibrium processes in petrology
• 日本鉱物科学会賞第15回受賞者 受賞記念研究紹介 岩石学における非平衡過程の速度論的研究
• ニホン コウブツ カガクカイショウ ダイ15カイ ジュショウシャ ジュショウ キネン ケンキュウ ショウカイ ガンセキガク ニ オケル ヒヘイコウ カテイ ノ ソクドロンテキ ケンキュウ

抄録

Non-equilibrium textures in metamorphic rocks contain a great deal of information on reaction kinetics and mass transfer in metamorphic processes. The reaction zone between chemically incompatible minerals (or rocks) is a good example of such non-equilibrium textures, and hence it is worth studying it in detail. Korzhinskii's chemical potential diagram is a useful method to understand the zonal sequence in the reaction zone. It can explain the variability in the zonal sequence by specifying the corresponding diffusion path on the chemical potential diagram. However, the method cannot tell us why the specific diffusion path is realized in nature. Fisher-Joesten's steady diffusion model can be considered as a quantification of Korzhinskii's chemical potential diagram, which introduces flux-ratio equations corresponding to specification of the diffusion path on the chemical potential diagram. The steady diffusion model successfully describes the stability fields of zonal sequences in the L-ratios (phenomenological coefficient ratios) diagram. Application of the steady diffusion model to an olivine-plagiocalse corona in a norite from the Ryoke Metamorphic Rock is presented. Extension of the steady diffusion model to open system is also discussed for the case of a metabasite-marble reaction zone in the Hirao Limestone and for myrmekites from the Okueyama granite. Experimental studies of the formation of reaction zones in the system dolomite-quartz-H₂O reveal temporal change in zonal sequence and mineral species of the reaction zones, showing a transition from an initial transient state to a steady state. Finally, I discuss periodic structures in rocks representing a pattern formation in a mineral-fluid system, taking an orbicular marble from the Hirao Limestone as an example. Although our understanding on such a ‘nonlinear structure’ is insufficient, I believe that there are some unknown physico-chemical processes behind such a structure.<br>

収録刊行物

• 岩石鉱物科学

  岩石鉱物科学 46 (1), 15-29, 2017

  一般社団法人　日本鉱物科学会

キーワード

• Non-equilibrium texture
• Reaction kinetics
• Mass transfer
• Diffusion
• Chemical potential diagram
• Irreversible thermodynamics
• Steady diffusion model
• Orbicular marble
• Pattern formation

詳細情報

• CRID: 1390282681501710720
• NII論文ID: 130005475605
• NII書誌ID: AA1146088X
• DOI: 10.2465/gkk.161202
• ISSN: 13497979
• ISSN: 1345630X
• NDL書誌ID: 028091095
• Web Site: http://id.ndl.go.jp/bib/028091095
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I028091095
• Web Site: https://www.jstage.jst.go.jp/article/gkk/46/1/46_161202/_pdf
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可