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...Ductile faults shear zones under appropriate temperature pressure and or fluid conditions rocks flow by creep accommodated at the grain scale motion of dislocations diffusion processes relative displacement between adjacent rock domains is however commonly concentrated in planar consisting intensely sheared bordered on both sides strain gradients accordingly are frequent metamorphic they range width from infinitesimal to several kilometres intensity nil low wall progressively increases across strongest contiguity plane faulting a process resulting offset localized velocity gradient distributed this simplified statement but like brittle fault usually contain number small structures that indicate sense often also transport dilate may host mineralization definition long narrow analogous without fracture planes unless reworked because dominantly deformation has caused concentration large into formation zone associated with drastic reduction size development well banded lineated called mylo...