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Article Dans Une Revue Tectonophysics Année : 2013

Effect of fluid salinity on subcritical crack propagation in calcite

Résumé

The slow propagation of cracks, also called subcritical crack growth, is a mechanism of fracturing responsible for a ductile deformation of rocks under crustal conditions. In the present study, the double-torsion technique was used to measure the effect of fluid chemistry on the slow propagation of cracks in calcite single crystals at room temperature. Time-lapse images and measurements of force and load-point displacement allowed accurate characterization of crack velocities in a range of 10−8 to 10−4 m/s. Velocity curves as a function of energy-release rates were obtained for different fluid compositions, varying NH4Cl and NaCl concentrations. Our results show the presence of a threshold in fluid composition, separating two regimes: weakening conditions where the crack propagation is favored, and strengthening conditionswhere crack propagation slows down.We suggest that electrostatic surface forces thatmodify the repulsion forces between the two surfaces of the crack may be responsible for this behavior.
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Dates et versions

hal-03904072 , version 1 (16-12-2022)

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Fatma Rostom, Anja Røyne, Dag Kristian Dysthe, François Renard. Effect of fluid salinity on subcritical crack propagation in calcite. Tectonophysics, 2013, 583, pp.68-75. ⟨10.1016/j.tecto.2012.10.023⟩. ⟨hal-03904072⟩
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