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Role of water film in water-rock reaction under unsaturated condition

Research Project

Project/Area Number 25400513
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Petrology/Mineralogy/Economic geology
Research InstitutionOsaka University

Principal Investigator

Yokoyama Tadashi  大阪大学, 理学(系)研究科(研究院), 助教 (60403101)

Project Period (FY) 2013-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords水膜 / 溶解 / 砂岩 / 水飽和率 / 風化 / 不飽和
Outline of Final Research Achievements

To study how water film wetting the surface of pores mediates the reaction and transport in a rock, water was passed through Berea sandstone under both the cases of water-saturated condition and unsaturated condition, and the amounts of elements dissolved from the rock were compared. Dissolution rate was predicted to be independent of water saturation if sufficient dissolution occurred via water film, but the result obtained was that the dissolution rate of Si under the unsaturated condition was 50% of that under the saturated condition. By comparing the cases of Berea sandstone and the other sandstone for which no difference of dissolution rate was observed between saturated condition and unsaturated condition, it is inferred that the efficiency of dissolution in water film depends heavily on the roughness of the pore surface.

Report

(4 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Research-status Report
  • 2013 Research-status Report
  • Research Products

    (4 results)

All 2015 2014 Other

All Journal Article (1 results) Presentation (3 results) (of which Invited: 3 results)

  • [Journal Article] Kinetics of chemical weathering: Field research, laboratory experiment and theoretical analysis of rhyolite weathering2015

    • Author(s)
      横山 正
    • Journal Title

      Japanese Magazine of Mineralogical and Petrological Sciences

      Volume: 44 Issue: 1 Pages: 45-51

    • DOI

      10.2465/gkk.141214

    • NAID

      130004793361

    • ISSN
      1345-630X, 1349-7979
    • Related Report
      2014 Research-status Report
  • [Presentation] 化学風化の速度論:流紋岩風化の野外調査、室内実験および理論解析2014

    • Author(s)
      横山 正
    • Organizer
      日本鉱物科学会2014年年会
    • Place of Presentation
      熊本大学
    • Year and Date
      2014-09-17 – 2014-09-19
    • Related Report
      2014 Research-status Report
    • Invited
  • [Presentation] 岩石-水反応のモデリング~表層環境を中心として~2014

    • Author(s)
      横山 正
    • Organizer
      日本地球惑星科学連合2014年大会
    • Place of Presentation
      パシフィコ横浜
    • Year and Date
      2014-04-28 – 2014-05-02
    • Related Report
      2014 Research-status Report
    • Invited
  • [Presentation] Characterization of the distributions of water and air in rock pores and its application to the understanding of water-rock interaction in the surface environment

    • Author(s)
      T. Yokoyama and N. Nishiyama
    • Organizer
      11th International Workshop on Water Dynamics 11
    • Place of Presentation
      Tohoku University
    • Related Report
      2013 Research-status Report
    • Invited

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Published: 2014-07-25   Modified: 2019-07-29  

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