Isothermal depolarization currents in marble rocks subjected to different stress modes before fracture

The technique of isothermal depolarization currents (IDC) was applied on natural polycrystalline marbles collected from Mt. Penteli (Greece) in order to investigate the changes of IDC relaxation parameters when the samples have suffered previously uniaxial compressional stress of various magnitudes, up to fracture. Experimental results manifest a differentiation in the shape of the depolarization current curves when the geo-material has suffered stress adequate to cause microcracks in its structure.