Diffusion-controlled melting in granitic systems at 800-900℃ and 100-200MPa : Temperature and pressure dependence of the minimum diffusivity in granitic melts

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著者

    • YUGUCHI Takashi
    • Department of Earth and Environmental Sciences, School of Science, Graduate School of Science and Technology, Kumamoto University
    • YAMAGUCHI Takashi
    • Department of Earth and Environmental Sciences, School of Science, Graduate School of Science and Technology, Kumamoto University
    • IWAMOTO Manji-rou
    • Department of Earth and Environmental Sciences, School of Science, Graduate School of Science and Technology, Kumamoto University
    • EGUCHI Hibiki
    • Department of Earth and Environmental Sciences, School of Science, Graduate School of Science and Technology, Kumamoto University
    • ISOBE Hiroshi
    • Department of Earth and Environmental Sciences, School of Science, Graduate School of Science and Technology, Kumamoto University
    • NISHIYAMA Tadao
    • Department of Earth and Environmental Sciences, School of Science, Graduate School of Science and Technology, Kumamoto University

抄録

This paper presents the temperature and pressure dependence of the minimum binary diffusivity in granitic melts. The minimum diffusivities are determined by monitoring the temporal development of the diffusion-controlled melt layer(DCM) in granitic systems (albite (Ab)-quartz (Qtz)-H<sub>2</sub>O and orthoclase (Or)-Qtz-H<sub>2</sub>O) gathered during 31 melting experiments under conditions of 800-900 °C and 100-200 MPa for durations of 19-72 h. The DCM is formed between single crystals (Ab or Or crystals) and powdered quartz in all runs and is characterized by a distinct concentration gradient. The maximum thickness of the DCM increases systematically with temperature, pressure, and run duration. Temporal development of the DCM obeys the parabolic growth rate law, using which the diffusivity can be estimated. Plots of concentrations along the diffusion paths in ternary diagrams (Na<sub>2</sub>O-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> diagram for the Ab-Qtz-H<sub>2</sub>O system and K<sub>2</sub>O-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> diagram for the Or-Qtz-H<sub>2</sub>O system) show linear trends rather than S-shaped trends, indicating that binary nature of diffusion occurs in these systems. Therefore, the diffusive component can be interpreted as an albite component or orthoclase and quartz components (SiO<sub>2</sub>) rather than an oxide or a cation.

収録刊行物

  • Journal of mineralogical and petrological sciences

    Journal of mineralogical and petrological sciences 107(2), 57-73, 2012-04-01

    日本鉱物科学会

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各種コード

  • NII論文ID(NAID)
    10030122277
  • NII書誌ID(NCID)
    AA11460926
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13456296
  • データ提供元
    CJP書誌  J-STAGE 
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