Metamorphic tectonite is a rock in which the fabric elements reflect the history of deformation. S- and B-tectonites are rocks characterized by planar and linear fabric elements, respectively, in which the fabric elements were produced by flow in the solid state. SF-tectonite (defined herein) is a metamorphic rock with planar fabric elements that were produced by fracture and (or) shear along a pervasive set of subparallel surfaces. Mélange is a rock body; albeit many mélanges contain tectonites, the presence of exotic blocks in a fragmented matrix–not the presence of tectonites–is the main criterion supported here for distinguishing a mélange from other rock units.

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