Fact Sheet 23, 2010

Geology of the South-East Greenland Archaean craton

The Archaean of South-East Greenland is a part of the North Atlantic craton and encompasses vast areas of agmatitic gneiss and alkaline intrusions in the Skjoldungen Alkaline Province. Alkaline rocks are otherwise absent from the North Atlantic craton in Greenland and many other Archaean cratons elsewhere. The geology has been reinterpreted based on new field data, petrology, and whole rock geochemistry gathered during the 2009 field season of the mineral resource assessment programme – MRAPSEG.

The rocks along the South-East coast of Greenland are briefly introduced after the initiation of the reconnaissance study under a new Mineral Resource Assessment Programme. This stretch of coastal Greenland constitutes Archaean rocks rimmed by two Proterozoic orogens. The Archaean craton is dominated by gneiss, with only small supracrustal sequences and several late-tectonic alkaline intrusions in the Skjoldungen area. The field study has outlined the basic regional geology as the probable host for mineral occurrences such as orthomagmatic Ni-PGE-Au, lode-gold, IOCG, and intrusion-related REE types.