Intermediate composition
Type of igneous rock
From Wikipedia, the free encyclopedia
In igneous petrology, an intermediate composition refers to a rock whose chemical composition is intermediate between felsic and mafic compositions, typically containing about 52–63 wt% SiO2. It is not an IUGS recognized term.[1]
Common intermediate volcanic rocks include andesite and trachyandesite, while common intermediate plutonic rocks include diorite and granodiorite.
