Dictionary of Geotourism

2020 Edition
| Editors: Anze Chen, Young Ng, Erkuang Zhang, Mingzhong Tian

Mylonite

Reference work entry
DOI: https://doi.org/10.1007/978-981-13-2538-0_1649

The term mylonite has two definitions: (1) Broadly, mylonite refers to a series of ductile tectonites that form at moderate and deep structural layers. Mylonites form in ductile shear zones and are a type of tectonite subject to fine granulation with a marked alignment that is created by plastic deformation, under which crystal dislocation and dynamic recrystallization of the same structure have taken place. The degree of ‘fragmentation’ of ductile tectonites is remarkably different from that of brittle tectonites. Ductile tectonites are characterized by an appearance like ‘a broken lotus tissue’. Based on the degree of fine granulation, mylonites can be divided into mylonitic rocks of varying degrees of mylonitization, such as primordium, mylonite, ultra-mylonite, phyllite mylonite and blastomylonite. (2) In a narrow sense, mylonite refers to a type of ductile tectonites in the moderate to deep structural layers with medium mylonitization. The degree of mylonitization is between...

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