Article

Physics and Chemistry of Minerals

, Volume 31, Issue 3, pp 176-182

Generation of hydrogen ions and hydrogen gas in quartz–water crushing experiments: an example of chemical processes in active faults

  • K. SaruwatariAffiliated withDepartment of Earth and Planetary Science, University of Tokyo Email author 
  • , J. KamedaAffiliated withDepartment of Earth and Planetary Science, University of Tokyo
  • , H. TanakaAffiliated withDepartment of Earth and Planetary Science, University of Tokyo

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Abstract

To understand the fundamental chemical processes of fluid–rock interaction during the pulverization of quartz grains in fault zones, quartz grains were crushed within pure water. The crushing experiments were performed batch style using a shaking apparatus. The crushing process induced a decrease in pH and an increase in hydrogen gas with increased shaking duration. The amount of hydrogen ions generated was five times larger than that of the hydrogen gas, which was consistent with the amount of Si radicals estimated from electron spin resonance measurements by Hochstrasser and Antonini (1972). This indicates that hydrogen gas was generated by consuming most of the Si radicals. The generation of hydrogen ions was most likely related to the presence of silanols on the newly formed mineral surface, implying a change of proton activities in the fluid after pulverization of quartz.

Keywords

Hydrogen ion Hydrogen gas Quartz Water Crushing