Which types of rock commonly make up granite batholiths?

Granite batholiths are primarily composed of granodiorite, but can also include gabbro and granite. These are all types of intrusive igneous rocks that form beneath the Earth's surface. While granite is rich in quartz and feldspar, granodiorite is similar but contains a higher proportion of plagioclase feldspar compared to alkali feldspar. Gabbro is a coarser-grained intrusive igneous rock that is typically dark-colored due to its high content of mafic minerals.123