Craton:
A craton is a large, coherent domain of Earth’s continental crust that has attained and maintained long-term stability, having undergone little internal deformation, except perhaps near its margins due to interaction with neighbouring terranes. Stable continental crust is an end product of intense magmatic, tectonic, and metamorphic reworking; hence, cratons consist of polydeformed and metamorphosed crystalline and metamorphic rocks (e.g., typically “granite-greenstone terrains” in the most ancient cratons). [astrophysics data system]
Noted in “Why supersonic, diamond-spewing volcanoes might be coming back to life,” Robin George Andrews, NewScientist (23 March 2024, paywall):
There was just one problem. Almost all kimberlites are found within cratons, the colossal, 200-kilometre-thick cores of continents, which don’t experience [the rifts caused by continental breakups]. Cratons are several billion years old. Even when supercontinents are broken, these cores remain intact. That meant kimberlite magmas picked the thickest, toughest parts of the continents to puncture through – the path of most resistance – something most eruptive activity tends to avoid.
