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A Key to Determine Metamorphic Grades and Major Isoreaction-Grads or Isograds in Common Rocks

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Petrogenesis of Metamorphic Rocks

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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.

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References

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Author information

Authors and Affiliations

  1. Institute of Mineralogy and Petrology, University of Göttingen, Germany

    Helmut G. F. Winkler (Professor and Director)

Authors
  1. Helmut G. F. Winkler
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Editor information

Editors and Affiliations

  1. Geological Survey, Ottawa, Canada

    Edgar Froese

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© 1974 Springer-Verlag New York Inc.

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Winkler, H.G.F. (1974). A Key to Determine Metamorphic Grades and Major Isoreaction-Grads or Isograds in Common Rocks. In: Froese, E. (eds) Petrogenesis of Metamorphic Rocks. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-9828-1_15

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  • DOI: https://doi.org/10.1007/978-1-4612-9828-1_15

  • Publisher Name: Springer, New York, NY

  • Print ISBN: 978-1-4612-9830-4

  • Online ISBN: 978-1-4612-9828-1

  • eBook Packages: Springer Book Archive

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