Metamorphic studies: research in progress

Abstract

Report of a meeting of the Metamorphic Studies Group held at Burlington House, 7 March 1984. The meeting was organized by Dr M. Brown. A Metamorphic Studies Group Meeting on ‘Metamorphic studies: research in progress’ and the third Annual General A Metamorphic Studies Group Meeting on ‘Metamorphic studies: research in progress’ and the third Annual General Meeting of the Group were held on March 1984 and more than 80 members participated. Nineteen papers were presented which covered a wide range of interests in metamorphic geology, including for the first time three papers on isotope geology. Six papers were given by research students. Overall, the large number of contributions to the meeting, the lively discussion of these contributions and the substantial attendance at the meeting suggest that the “current research” style of meeting is very worthwhile. The morning session, chaired by B. Harte, was opened by R. P. Hall who presented an account the inter-relationships between metamorphism and magmatic and tectonic episodes in two contrasted areas within the Archaean craton of southern W Greenland. In Ivisgrtoq the rocks are at amphibolite facies and have never been to granulite facies. In contrast, in the eastern Sukkertoppen region the rocks are partly retrogressed from granulite facies. In such retrogressed granulites, the presence of ‘blebby’ hornblende and biotite after pyroxene is characteristic. Hall presented data on various reactions by which hypersthene has been replaced and concluded that enclosing acid gneisses in which no evidence granulite facies is preserved must have provided a metasomatic influx of elements such as potassium