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https://hdl.handle.net/2115/85067

Generation of oxidising fluids by comminution of fault rocks

英語

2021-10-29

European Association of Geochemistry

Geochemical Perspectives Letters

19

32-35

Mechanochemical reactions exert a crucial control on the chemical environments of crustal fault zones during co-seismic and post-seismic periods. Comminution due to faulting causes activation of fault rock surfaces, such as the production of reactive radical species. In this study, we report on the generation of H2O2 by immersion of comminuted sedimentary, igneous, and metamorphic rocks that are broadly representative of those present at a variety of depths in subduction zones. Our experiments demonstrate that fresh surfaces of these rocks have an H2O2 productivity of 1.3-10.4 nmol m(-2) (mean = 5.4 nmol m(-2)). Ina natural fault zone environment, H2O2 produced after a slip event is likely to react with Fe-bearing mineral surfaces or Fe2+ in porewater, or thermally decompose to produce more oxidative center dot OH. The oxidising fluid produced by fault rupture in one patch may spread and induce corrosion and degradation of surrounding fault zones. These chemical processes are likely to be important factors influencing the interaction between neighbouring seismic activities.

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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

2410-339X

2410-3403