Source, evolution, and age of coronitic gabbros from the Arendal-Nelaug area, Bamble, Southeast Norway

Abstract

In this thesis the results of a petrological, geochemical and isotopic study of five coronitic gabbros (hyperites) from the Arendal-Nelaug area, Bamble Sector, South Norway, are presented. The scope of this study was 1) to determine the age of these gabbros, 2) to study their magmatic and chemical evolution, 3) to study the nature of the Proterozoic mantle below Bamble from Nd isotope data, and 4) to infer the composition of the mantle source(s) of the gabbros.