Metabasite bodies as chronological and structural markers in the gneisses east of Satut, Umanak district, central West Greenland

Abstract

The occurrence of pod-like and more irregularly shaped discordant metabasite bodies in the Umanak district was mentioned by Pulvertaft (1973) and their potential as chronological and structural markers was reiterated by Pulvertaft (1979). However, in many other basement areas where irregular metabasite bodies occur, it has been found that irregularities of form and structure are better interpreted as consequences of synkinematie intrusion rather than post-intrusion deformation, so the use of metabasic intrusions as chronological markers is not so straightforward as might appear at first sight (see for example papers and references in Korstgård, 1979).