S-type granite
Quick Summary
S-type granitoids are a type of granite formed from sedimentary rocks, as opposed to I-type granitoids which originate from igneous rocks. S-type granitoids are characterized by high amounts of aluminum oxide (Al₂O₃) and relatively low amounts of sodium oxide (Na₂O). They may also contain minerals like garnet, cordierite, and sillimanite, while amphibole and pyroxene are less common compared to I-type granitoids. Granite itself is a coarse-grained intrusive igneous rock rich in quartz and feldspar, formed from cooling magma deep within the Earth's crust.1
Ask Britannica AI about this topic
Britannica doesn't have a full article on this topic, so we've curated a list of our relevant coverage.
granite…high amounts of Na2O, and S-type granitoids, derived from sedimentary protoliths and containing high amounts of Al2O3 and relatively low amounts of Na2O. Amphibole and pyroxene are more common in I-type granitoids, while S-type granitoids may have garnet, cordierite, and sillimanite. Both types of granitoids may also contain biotite and…
Read More…high amounts of Na2O, and S-type granitoids, derived from sedimentary protoliths and containing high amounts of Al2O3 and relatively low amounts of Na2O. Amphibole and pyroxene are more common in I-type granitoids, while S-type granitoids may have garnet, cordierite, and sillimanite. Both types of granitoids may also contain biotite and…
Read More
igneous rockConvergent plate boundariesThe other type, called S-type granite, has muscovite and biotite and is depleted in sodium but enriched in aluminum such that corundum occurs in the norm and isotopic signatures. This suggests that such granites were formed by partial fusion of sedimentary rocks.
Read MoreThe other type, called S-type granite, has muscovite and biotite and is depleted in sodium but enriched in aluminum such that corundum occurs in the norm and isotopic signatures. This suggests that such granites were formed by partial fusion of sedimentary rocks.
Read More