Metamorphism at contacts of acid rocks with anorthosite and amphibolite in the Fiskenæsset region

Abstract

During the geological mapping in the Fiskenæsset region the origin of the different gneiss types has been much debated, and it has been suggested that some of the gneisses may represent metasomatically altered anorthositic and amphibolitic rocks. F. Kalsbeek suggested that to test this hypothesis a study should be made of possible mineralogical and chemical changes at boundaries between anorthositegneiss and amphibolite-gneiss. The first results of such an investigation are reported here.