Ductile deformation or Ductility is a continuous deformation by plastic or viscous flow. It refers to the tendency of rock to deform to large strains without macroscopic fracturing. Such behaviour may occur in unlithified or poorly lithified sediments, in weak materials such as halite or at greater depths in all rock types where higher temperatures promote crystal plasticity and higher confining pressures suppress brittle fracture. It produces certain kinds of folds, ductile faults, cleavages, and foliations.
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