Monzogabbro Explained

Monzogabbro is an intrusive rock with a composition intermediate between gabbro and monzonite. It is defined in the QAPF classification as coarse-grained igneous rock in which quartz makes up 0% to 5% of the QAPF mineral fraction, plagioclase makes up 65% to 90% of the total feldspar content, and the plagioclase is calcium-rich (%An > 50). [1] [2] [3]

Notes and References

  1. Le Bas. M. J.. Streckeisen. A. L.. The IUGS systematics of igneous rocks. Journal of the Geological Society. 148. 5. 825–833. 10.1144/gsjgs.148.5.0825. 1991JGSoc.148..825L. 1991. 10.1.1.692.4446. 28548230.
  2. 1999. Rock Classification Scheme - Vol 1 - Igneous. British Geological Survey: Rock Classification Scheme. 1. 1–52.
  3. Book: Philpotts . Anthony R. . Ague . Jay J. . Principles of igneous and metamorphic petrology . 2009 . Cambridge University Press . Cambridge, UK . 978-0-521-88006-0 . 2nd . 139-143.

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