The Precambrian supracrustal rocks of Nunataq, north-east Disko Bugt, West Greenland

Abstract

Supracrustal rocks preserved in a major syncline in southern Nunataq comprise an Archaean and a Proterozoic sequence. An angular discordance between the two sequences is preserved locally. The basal development of the younger sequence shows similarities with that of the lower Proterozoic Mârmorilik Formation of the Uummannaq region north of Nuussuaq. The major syncline–anticline fold pair of southern Nunataq is part of a regional system of E–Wtrending Proterozoic folds which also deform the supracrustal rocks of Anap Nunaa, south of Nunataq. Recognition of a major syncline in southern Anap Nunaa, largely obliterated by albitisation, permits a simpler structural interpretation than previously suggested.