Re-appraisal of the Ikermit supracrustal suite of the Ketilidian border zone in South-East Greenland

Abstract

Previous workers in the Ketilidian orogen of South-East Greenland reported extensive outcrops of acid vo1canic rocks and related gneisses which they described as the Ikermit supracrustal suite. The suite was regarded as a favourable host for sulphide mineralisation. New fjeld and petrographic data show that the 'acid volcanic rocks' from the type locality on Ikermit island are entirely Archaean orthogneisses with abundant, but local, mylonites. These gneisses and mylonites occur within the wide border zone between the Ketilidian orogen and the Archaean foreland to the north. The name 'Ikermit supracrustal suite' should be abandoned.