H2 generation in wet grinding of granite and single‐crystal powders and implications for H2 concentration on active faults
H2 generation in wet grinding of granite and single‐crystal powders and implications for H2 concentration on active faults
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花岗岩和单晶粉末湿磨过程中 H2 的产生及其对活动断层上 H2 浓度的影响
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发表时间：
2003
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通讯作者：
Hidemi Tanaka
中科院分区：
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作者：
J. Kameda;K. Saruwatari;Hidemi Tanaka
在环境条件下，使用球磨机在pH受控的纯水溶液中研磨花岗岩和石英、碱性长石、黑云母和白云母的单晶，以检查H2的产生。通过研磨产生的H2的量与研磨样品的表面积线性相关。直线的斜率表示每种矿物的产氢率：3.9 × 10−3 μmol/m2（石英）; 1.0 × 10−3 μmol/m2（碱性长石）; 3.6 × 10−2 μmol/m2（黑云母）; 2.2 × 10−2 μ mol/m2（白云母）; 4.5 × 10−3 μmol/m2（花岗岩）。黑云母和白云母的高产可能与晶体结构中羟基的存在有关。有趣的是，在黑云母和花岗岩的情况下，H2的产生并不取决于溶液的pH值，而几个活动断层上的流体酸度和H2浓度之间的比较表明，在相对酸性的泉水中通常会观察到非常高的H2。这种相关性可以解释为当地丰富的层状硅酸盐。
Granite and single crystals of quartz, alkali feldspar, biotite and muscovite are ground in pH‐controlled and pure water solutions using a ball mill at ambient condition to examine the production of H2. The amount of H2 generated by grinding is linearly related with the surface area of ground samples. The slope of the straight line indicates H2 productivity of each mineral: 3.9 × 10−3 μmol/m2 (quartz); 1.0 × 10−3 μmol/m2 (alkali feldspar); 3.6 × 10−2 μmol/m2 (biotite); 2.2 × 10−2 μmol/m2 (muscovite); 4.5 × 10−3 μmol/m2 (granite). High productivity of biotite and muscovite is probably related to the existence of hydroxyls in their crystal structures. Interestingly, H2 production did not depend on the pH of the solution in the case of biotite and granite, while comparisons between fluid acidity and H2 concentration on several active faults suggest that anomalously high H2 is commonly observed at relatively acidic water springs. This correlation may be explained by locally high abundance of phyllosilicates.