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Thermodynamic model for volumetric property of hydrous magmas

Research Project

Project/Area Number 17K05707
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

Yamashita Shigeru  岡山大学, 惑星物質研究所, 准教授 (30260665)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords岩石鉱物鉱床学 / マグマ / 高温高圧実験 / 火山 / 実験岩石学 / 水 / 流体 / 岩石・鉱物・鉱床学
Outline of Final Research Achievements

The speciation of water in an albitic melt was studied in-situ at high pressure and high temperature using micro FTIR-Raman spectroscopy. The water speciation in the hydrous melt was found to be independent of pressure. This indicates that the standard volume change of the water speciation equilibrium is negligibly small, and hence the volumetric property of hydrous melts is independent of water speciation.

Academic Significance and Societal Importance of the Research Achievements

現在、マグマの上昇や固化の数値シミュレーションで広く用いられている含水マグマ体積モデルは、マグマに溶け込んでいる水を全て「H2O」として扱い、H2O分子とOH基を区別していない。それはしたがって、まったく経験的なモデルであるが、この研究の成果はそうしたモデルの妥当性と信頼性に熱力学的な根拠を与えるものである。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (3 results)

All 2019 2018 2017

All Presentation (3 results) (of which Int'l Joint Research: 3 results)

  • [Presentation] Experimental study of the effect of composition on water solubility in natural silicate melts2019

    • Author(s)
      Shigeru Yamashita
    • Organizer
      JpGU Meeting 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Dehydration kinetics of talc in the system MgO-SiO2-H2O probed in-situ by vibrational spectroscopy at high pressure and high temperature2018

    • Author(s)
      Shigeru Yamashita
    • Organizer
      JpGU Meeting 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Determination of water content of natural talc: application to a recipe for hydrogen manometry2017

    • Author(s)
      Shigeru Yamashita
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research

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Published: 2017-04-28   Modified: 2021-02-19  

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