Generation of oxidising fluids by comminution of fault rocks

Kameda, J.; Okamoto, Akiyoshi

doi:10.7185/geochemlet.2131

Cited by 1 publication

(2 citation statements)

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“…3 ). We note that our measured H 2 O 2 concentrations may underestimate total production due to subsequent decomposition 25 , particularly if the decomposition is accelerated by higher temperatures and/or the presence of Fe species via Fenton reactions 28 . The presence of low concentrations of detectable dissolved iron species (up to nearly 0.037 μmol g −1 (18.5 μM) in peridotite experiments) suggests the potential for Fenton reactions to have accelerated the removal of H 2 O 2 (Eqs.…”

Section: Resultsmentioning

confidence: 86%

“…While there are several reports suggesting the room temperature generation of H 2 O 2 from the reaction of SiO• with water, the majority of these have either carried out the crushing of silicate minerals in air, and/or addition of water in air 6 , 21 , 25 . As noted above, however, H 2 O 2 generation from crushed silicate minerals is greatly increased in the presence of O 2 5 , 20 due to the reaction of mineral surface defects with O 2 to generate the more reactive superoxide radical (SiOO•; Eq.…”

Section: Resultsmentioning

confidence: 99%

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Tectonically-driven oxidant production in the hot biosphere

et al. 2022

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Genomic reconstructions of the common ancestor to all life have identified genes involved in H2O2 and O2 cycling. Commonly dismissed as an artefact of lateral gene transfer after oxygenic photosynthesis evolved, an alternative is a geological source of H2O2 and O2 on the early Earth. Here, we show that under oxygen-free conditions high concentrations of H2O2 can be released from defects on crushed silicate rocks when water is added and heated to temperatures close to boiling point, but little is released at temperatures <80 °C. This temperature window overlaps the growth ranges of evolutionary ancient heat-loving and oxygen-respiring Bacteria and Archaea near the root of the Universal Tree of Life. We propose that the thermal activation of mineral surface defects during geological fault movements and associated stresses in the Earth’s crust was a source of oxidants that helped drive the (bio)geochemistry of hot fractures where life first evolved.

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Section: Resultsmentioning

confidence: 86%