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Deformation of Rock

Deformation of Rock.

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Deformation of Rock

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  1. Deformation of Rock • Deformation of rock involves changes in the shape and/or volume of these substances. Changes in shape and volume occur when stress and strain causes rock to buckle and fracture or crumple into folds. A fold can be defined as a bend in rock that is the response to compressional forces. Folds are most visible in rocks that contain layering.

  2. Not all rock types will fold easily! • The rock material must have the ability to deform under pressure and heat. • The higher the temperature of the rock the more plastic it becomes. • Pressure must not exceed the internal strength of the rock. If it does, fracturing occurs. • Deformation must be applied slowly.(if a sudden movement you most likely will have faults)

  3. Not all rocks are folded and faulted! • The simplest rock structures are horizontal and these consist of rock that have been slowly uplifted without being distrurbed. (Coast of North Mayo and Co Clare) • Uniclinal Structures formed by the gentlest of tectonic activity result in a gentl uplift which produces a uniform tilt in one direction. (Dartry and Cuilcagh Mountains)

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