Geochemical Modeling of long-term evolution for granitic groundwater

Hiroaki Murakami; Takahiro Watanabe; Teruki Iwatsuki

Presentation information

[JJ] Poster

H (Human Geosciences) » H-CG Complex & General

[H-CG32] [JJ] Nuclear Energy and Geoscience

Tue. May 23, 2017 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall HALL7)

convener:Eiji Sasao(Tono Geoscience Center, Japan Atomic Energy Agency), Tsutomu Sato(Faculty of Engineering Hokkaido University), Ryuta Hataya(Central Research Institute of Electric Power Industry)

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[HCG32-P06] Geochemical Modeling of long-term evolution for granitic groundwater

*Hiroaki Murakami¹, Takahiro Watanabe¹, Teruki Iwatsuki¹ (1.Japan Atomic Energy Agency)

Keywords:granite, groundwater, geochemical modeling

To understand long-term geochemical stability at deep underground condition in Toki granitic area, we consider about water-rock interaction by thermodynamics calculation using typical granitic minerals, such as anorthite, calcite, quartz, albite and K-feldspar. pH ranges were estimated by the PHREEQC program using measured values for residence time of groundwater and mineral composition in the Toki area. This study indicates that pH values of the granitic-groundwater would be alkaline (ca. 8-10) when the meteoric water is the main source in the area.
Acknowledgement: This study was carried out under a contract with METI as part of its R&D supporting program for developing geological disposal technology.