TL;DRAbstract
Rocks are commonly subjected to tectonic deformation, with the result that they undergo a change of shape (strain), producing deformed rocks known as tectonites. Knopf (1931, p. 7) translated the original definition of tectonites (Sander, 1911, 1930) as ‘metamorphic rocks deformed by differential movements that integrate into the tectonic movement as a whole’. In this definition, the word ‘metamorphic’ should be extended to include deformed rocks that undergo only small degrees of alteration. This involves rocks that many people would call ‘diagenetic’ (Section 2.2.7), there being a gradation between ‘burial metamorphism’ and diagenesis (see, for example, Vernon, 1976). The type and amount of strain depend on both the local directed pressure (non-hydrostatic stress; deviatoric stress) and the mechanical properties of the rock. The detailed, quantitative study of strain is a complex topic that is outside the scope of this book.
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Rocks are commonly subjected to tectonic deformation, with the result that they undergo a change of shape (strain), producing deformed rocks known as tectonites. Knopf (1931, p. 7) translated the original definition of tectonites (Sander, 1911, 1930) as ‘metamorphic rocks deformed by differential movements that integrate into the tectonic movement as a whole’. In this definition, the word ‘metamorphic’ should be extended to include deformed rocks that undergo only small degrees of alteration. This involves rocks that many people would call ‘diagenetic’ (Section 2.2.7), there being a gradation between ‘burial metamorphism’ and diagenesis (see, for example, Vernon, 1976). The type and amount of strain depend on both the local directed pressure (non-hydrostatic stress; deviatoric stress) and the mechanical properties of the rock. The detailed, quantitative study of strain is a complex topic that is outside the scope of this book.
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