Abstract
Excavation and ventilation of underground drifts in the Callovian-Oxfordian (COx) argillaceous rock induce gas exchanges between atmospheric air and rock pore water on the rock surfaces exposed to air. The composition evolution of the gas present in closed volumes of various sizes has been monitored in the Bure URL over months to years. Amongst the atmospheric air gases, O2 reacts with several rock components, the most important being pyrite; these components are oxidized while O2 is consumed. This reaction induces the production of CO2 coming from carbonate dissolution. As a result, CO2 may locally become a major component of the gas phase. In situ data regarding these gas exchanges gives insights on both the pore water thermodynamic model and the kinetics of the processes involved.
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