Ilimaussaq intrusive complex

Ilimaussaq intrusive complex is a large Mesoproterozoic alkalic layered intrusion on Greenland’s Narsaq peninsula, formed about 1.16 billion years ago. Important both as a mountain landscape and a major geological site, it is the type locality of agpaitic nepheline syenite, an unusual alkaline igneous rock, and of thirty rare minerals, including aenigmatite, arfvedsonite, sodalite, eudialyte, and tugtupite. Roughly 8 by 17 kilometres in area and about 1,700 metres thick where exposed, it reveals a substantial section of the intrusion. Kvanefjeld within the complex contains uranium and large reserves of rare-earth elements, zirconium, niobium, and beryllium, giving the area lasting scientific and resource significance.

Kommune Kujalleq · Greenland