Age relations of the Precambrian Mârmorilik Marble Formation, central West Greenland

Abstract

The Mârmorilik Formation is one of the most important metasedimentary formations in the Precambriah of Greenland. lt is the host rock of the Sorte Engel (Black Angel) zinc-lead ore body, it is the largest potential source of calcitelimestone in West Greenland, and it is a striking marker horizon which greatly facilitates the recognition of major structures in tile Precambtian basement. The formation is composed almostentirely or carbonate rock (dolomite arid calcite marbles); and the original depositional thickness of these rocks has been estimated to be more than 1 km (Henderson & Pulvertaft, 1967) an order of thickness that one of us (A.A.G.) has confirmed during recent detailed mapping south-east of Mârmorilik.