Abstract
This chapter summarizes some highlights given in previous chapters in order to provide a key for the determination of metamorphic grades and isoreaction-grads. High-grade granulitic rocks diagnostic of the regional hypersthene zone are not considered here because they are treated later. Sequences of isograds are indicated by selected mineral reactions in common rocks. A more precise determination of metamorphic grade may be achieved by referring to the details presented in each relevant chapter. Earlier, in Chapter 7, arguments were given for setting up major divisions of metamorphic grade within the large P-T field of metamorphic conditions. These are very-low grade, low grade, medium grade, and high grade. With respect to pressure the metamorphic grades have been further subdivided
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References
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© 1976 Springer Science+Business Media New York
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Winkler, H.G.F. (1976). A Key to Determine Metamorphic Grades and Major Isoreaction-Grads or Isograds in Common Rocks. In: Petrogenesis of Metamorphic Rocks. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-22283-6_15
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DOI: https://doi.org/10.1007/978-3-662-22283-6_15
Publisher Name: Springer, Berlin, Heidelberg
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