Ilimaussaq intrusive complex

The Ilimaussaq intrusive complex is a large alkalic layered intrusion located on the southwest coast of Greenland. It is Mesoproterozoic in age, about 1.16 Ga. It is the type locality of agpaitic nepheline syenite and hosts a variety of unusual rock types.[1]

Tugtupite on quartz from Ilimaussaq complex

The complex is noted for a wide variety of rare minerals and is the type locality for thirty minerals, including: aenigmatite, arfvedsonite, sodalite, eudialyte and tugtupite. [2]

The complex has an areal extent of 8 by 17 km and an exposed thickness of 1700 m. The complex includes Kvanefjeld, a uranium deposit and a large reserve of rare-earth elements, zirconium, niobium and beryllium.[1]


  1. ^ a b Sørensen, H. (2001), Brief introduction to the geology of the Ilímaussaq alkaline complex, South Greenland, and its exploration history (PDF), GEOLOGY OF GREENLAND SURVEY BULLETIN, 190, archived from the original (PDF) on 2017-08-10
  2. ^ Mindat locality.

Coordinates: 60°56′05″N 45°52′09″W / 60.93472°N 45.86917°W / 60.93472; -45.86917