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A granitoid is a coarse grained igneous rock composed mostly of quartz, Kspar (alkali-feldspar) and plagioclase), with 20-60% quartz on the QAPF diagram. most commonly granite and granodiorite.

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Classification of GranitoidHide

Rocks in sections 2,3,4 and 5 of the QAPF diagram.

Sub-divisions of GranitoidHide

Mineralogy of GranitoidHide

Essential minerals - these are minerals that are required within the classification of this rock:
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Feldspar > Alkali FeldsparFeldspar Group minerals rich in Potassium or Sodium.
Feldspar > PlagioclaseA petrological term for Albite-Anorthite Series.

Synonyms of GranitoidHide

References for GranitoidHide

Reference List:
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Ishihara, S. (1977) The magnetite-series and ilmenite-series granitic rocks. Mining Geology: 27: 293-305.
Tulloch, A. (1979) Secondary Ca-Al silicates as low-grade alteration products of granitoid biotite. Contributions to Mineralogy & Petrology: 69: 105-117.
Amov, B. and Arnaudov, V. (1981) Lead isotope data on the Paleozoic granitoids and ore mineralization from the Western Balkan and the Tran district. I. Isotope ratio and geochronology. Geol. Balc., 11, 2.
Neiva, A. (1981) Geochemistry of hybrid granitoid rocks and their biotites from Central Northern Portugal and their petrogenesis. Lithos: 14: 149-163.
Roberts, M. and Clemens, J. (1993) Origin of high-potassium, calc-alcaline, I-type granitoids. Geology: 21: 825-828.

Internet Links for GranitoidHide URL:
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