H2 generation in wet grinding of granite and single-crystal powders and implications for H2 concentration on active faults

Details 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

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30qde10k&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 20, pp. SDE 10-1, CiteID 2063, DOI 10.1029/2003GL018252

Physics

2

Geochemistry: General Or Miscellaneous, Seismology: Seismic Hazard Assessment And Prediction, Mineralogy And Petrology: Crystal Chemistry

Scientific paper

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.

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