This page is currently not sponsored. Click here to sponsor this page.
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.
Classification of GranitoidHide
Sub-divisions of GranitoidHide
- Brecciated granite
- Muscovite-biotite granite
- Biotite granite
- Hornblende-biotite granite
- Aplitic granite
- Granophyric granite
- Porphyritic granite
- Charnockitic granite
- Rapakivi granite
- Graphic granite
- Pegmatitic granite
- Hornblende granite
- Riebeckite granite
- Fluorine-rich granite
- A-type granite
- I-type granite
- S-type granite
- C-type granite
- M-type granite
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:
References for GranitoidHide
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-alcaline, I-type granitoids. Geology: 21: 825-828.