Abstract
Metamorphic grade has been used as an inprecise term “to signify the degree or state of metamorphism” (Tilley, 1924). For example, low-grade metamorphism implies formation at relatively low temperatures typical of the greenschist facies, and medium-grade metamorphism refers to conditions of the amphibolite facies. Although not necessary in principle for a classification of metamorphism, it is very practical in fieldwork and makes orientation much easier if the entire P,T range of metamorphic conditions is divided into a few large divisions of metamorphic grade:
Very-low grade (sehr schwach)
Low grade (schwach)
Medium grade (mittel)
High grade (stark)
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Winkler, H.G.F. (1976). The Four Divisions of Metamorphic Grade. In: Petrogenesis of Metamorphic Rocks. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-22283-6_7
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