Three mafic volcanic vents named , Crater 2657 and are also considered postglacial. The former two are andesitic, while the latter is a pyroclastic cone. Mafic volcanism appears to have decreased after glacial times at Laguna del Maule, probably because such magmas were hindered from ascending by a more silicic magma system, and the post-glacial volcanism has a mainly silicic composition. The magma chamber acts as a trap for mafic magma, preventing it from rising to the surface and thus explaining the absence of postglacial mafic volcanism.