Most Granites Are Granitoids

C isolated bodies of banded granite gneiss in massive granitoids pink granite.

Most granites are granitoids. Pyroxene granites are called charnockite and pyroxene monzogranite is mangerite. These grade into monzonites and syenites which at higher silica contents may contain minor amounts of free quartz. Loosely applied to a wide range of felsic plutonic rocks granite sensu stricto granodiorite tonalite associated volcanics occur and have same origin but are frequently eroded away typically associated with diorites and gabbros in granitic batholiths granitoids are the most abundant plutonic rocks in the. It is the most common plutonic rock of the earth s crust forming by the cooling of magma silicate melt at depth.

Learn more about the properties and uses of granite in this article. B enclaves of mafic volcanics greenstone belt rocks in the massive granitoids at dhaura. The most silica poor portions of this suite are ferrodiorite and monzodiorite also called jotunite. A granitoid or granitic rock is a variety of coarse grained plutonic rock granite or similar which mineralogically is composed predominantly of feldspar quartz and mica.

But in some rocks pyroxene which is even more mafic appears instead. This is unusual enough that some pyroxene granitoids have their own names. The most common dark minerals in granitoids are hornblende and biotite. Examples of granitoid rocks include granite quartz monzonite quartz diorite syenite granodiorite tonalite and trondhjemite many are created by continental volcanic arc subduction or the collision of sialic masses.