Fig. 7: Mohr-Coulomb diagram (normal stress σn - shear stress σs) for the studied omphacitite.
The diagrams were computed for vertical stresses (σV) of 1 and 2 GPa (a, b, respectively), corresponding to the minimum compressive stress (σ3; see methods for parameters and assumptions). Failure occurs at Δσ of ~ 1.4 a and 3.4 b GPa for hydrostatic pore fluid factor values (λ = 0.4); shear failure occurs at Δσ of 300 MPa for sublithostatic λ values, both hybrid and extension failure occur at Δσ of 114 MPa and 100 MPa for supralithostatic λ values.
