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Granitoid

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About GranitoidHide

A granitoid is a coarse grained igneous rock composed mostly of quartz, K-feldspar (alkali-feldspar) and plagioclase), with 20-60% quartz on the QAPF diagram. It usually contains minor micas and/or amphiboles. Most commonly granite and granodiorite.


Classification of GranitoidHide

QAPF_P_2,3,4,5.png

Rocks in sections 2 (alkali-feldspar granite), 3 (granite), 4 (granodiorite) and 5 (tonalite) on the QAPF diagram.
Section 3 can be divided into 3a (syenogranite) and 3b (monzogranite).

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:
AmphiboleAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Feldspar > Alkali FeldsparFeldspar Group minerals rich in Potassium or Sodium.
Feldspar > PlagioclaseA petrological term for Albite-Anorthite Series.
MicaA petrological term for Mica Group.

Synonyms of GranitoidHide

References for GranitoidHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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-alkaline, I-type granitoids. Geology: 21: 825-828.

Internet Links for GranitoidHide

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