Model selection and parameter extraction for mineral dissolution reactions using a data-driven approach

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K14827
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 17040:Solid earth sciences-related
• Research Institution: Kokushikan University (2021-2022); Japan Agency for Marine-Earth Science and Technology (2019-2020)
• Principal Investigator: Oyanagi Ryosuke 国士舘大学, 理工学部, 講師 (90835729)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 蛇紋岩化反応 / 水熱実験 / 流通式水熱実験 / 反応経路モデル / 反応速度

Outline of Final Research Achievements

To better understand the chemical changes of rocks in the Earth's interior, it is important to clarify the alteration reaction rates of minerals. In this study, experiments were conducted to clarify the alteration reaction rate of olivine (serpentinization) reactions. In the experiment, hot water at 260-300°C was poured over the olivine powder (circulation-type hydrothermal reaction experiment), and changes in the alteration reaction were observed over time. After the reaction, the surface of the olivine powder was observed with a scanning electron microscope, and serpentinite was found to be precipitated. Comparison of the experimental results with a theoretical model of the alteration reaction showed that the ratio of the rate of olivine dissolution to the rate of serpentinite precipitation reaction varied with temperature and time.

Free Research Field

岩石・鉱物学

Academic Significance and Societal Importance of the Research Achievements

かんらん石の熱水変質に関する実験を行い、反応メカニズムや反応速度を明らかにした。この成果は、固体地球の理解や工学的利用のための基礎データとなることが期待される。