Wiktionary
anatexis
n. (context geology English) The metamorphism of plutonic rock into magma in the lower levels of the crust
Wikipedia
Anatexis
Anatexis (via Latin from Greek roots meaning "to melt down") in geology, refers to the differential, or partial, melting of rocks, especially in the forming of metamorphic rocks such as migmatites.
Usage examples of "anatexis".
In nearby regions of the Massif Central we see even more clearly the workings of intracrustal metamorphism, the anatexis engendered above one or more ascending asthenospheric diapirs.