Generation of hydrogen ions and hydrogen gas in quartz–water crushing experiments: an example of chemical processes in active faults
Generation of hydrogen ions and hydrogen gas in quartz–water crushing experiments: an example of chemical processes in active faults
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DOI：
10.1007/s00269-004-0382-2
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发表时间：
2004-04
影响因子：
1.4
通讯作者：
K. Saruwatari;J. Kameda;Hidemi Tanaka
中科院分区：
文献类型：
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作者：
K. Saruwatari;J. Kameda;Hidemi Tanaka
为了了解断裂带中石英颗粒粉碎过程中流体-岩石相互作用的基本化学过程，将石英颗粒在纯水中粉碎。破碎实验使用振荡装置以分批方式进行。破碎过程引起pH值降低和氢气增加，并增加摇动持续时间。产生的氢离子的量是氢气的5倍，这与Hochstrasser和Antonini（1972）通过电子自旋共振测量估计的Si自由基的量一致。这表明氢气是通过消耗大部分Si自由基而产生的。氢离子的产生很可能与新形成的矿物表面存在硅醇有关，这意味着石英粉碎后流体中质子活性发生了变化。
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.