antimagmatist

\\| ̷ ̷(ˌ) ̷ ̷ at anti- I +|magmətə̇st\ noun (-s)

Etymology: anti- (I) + New Latin magmat-, magma + English -ist

: one that believes that granite and other similar igneous rocks are formed in situ by a process called granitization rather than intruded as magma