Used attributively before a noun to mean 'relating to, originating in, or characteristic of a mantle (especially the Earth's mantle)'.
Translations
Mantle plumes are thought to be sources of volcanic hotspots.
Les panaches mantelliques sont considérés comme une source de points chauds volcaniques.
Relating to or originating in a mantle, especially the Earth's mantle. Mantle plumes are thought to be sources of volcanic hotspots.