DECOLLEMENT

A 'décollement' horizon is a tectonic surface that acts as a gliding plane between two masses in a thrust fault relationship. A décollement horizon can either form due to a low bulk modulus between bodies (usually in lithologies such as marls, shales and evaporites) or can form along planes of high pore pressures. Ramsay, J, 1967, Folding and Fracturing of Rocks.

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