Mineralised ultramafic rocks in South Greenland

Abstract

In 1960 several mineralised ultramafic boulders with a remarkable content of Pt were found by M. Loretan in the neighbourhood of Sarqa fjord in the Nanortalik district, South Greenland. This stimulated interest in a closer examination of the mafic and ultramafic rocks of South Greenland and in 1962 and 1963 J. P. Berrange mapped three ultramafic plutons in the district. One of the plutons is situated close to the place where Loretan had found the mineralised ultramafic boulders. Berrange (in press) conduded that the plutons had a greater affinity to the appinitic suite of rocks than to Gardar rocks, and that the plutons were emplaced late during the plutonic development of the Ketilidian mobile belt. Berrange also considered that none of the plutons carried sulphides in an amount big enough to constitute ore.