Tectonite

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Tectonites are rocks that have a strongly developed fabric caused by ductile deformation.

[edit] Classification

S-Tectonites have a dominant planar fabric and may indicate a flattening type of strain. This may also be due to a lack of minerals capable of giving a lineation e.g. in a phyllonite. L-Tectonites have a dominant linear fabric and generally indicate a constrictional type of strain. L-S Tectonites have equally developed linear and planar fabric elements and may indicate a plane strain deformation. Many mylonites are L-S tectonites consistent with a simple shear deformation.

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