Rb/Sr whole rock and U/Pb zircon age studies on granites of the Early Proterozoic mobile belt of South Greenland

Abstract

In 1969 the Scottish Research Reactor Centre and GGU started a joint project on age dating work in the Early Proterozoic mobile belt of South Greenland (Ellitsgaard-Rasmussen, 1970, p. 8). During that summer 85 samples of two early orogenic and four late to post-orogenic granites, including rapakivi granite, were collected around Julianehåb and in the Tasermiut area in western South Greenland. Since then, Rb/Sr isotope dilution analyses have been carried out on 31 whole rock specimens (3 in duplicate) and 3 minerals of five granites, and U/Pb isotope dilution analyses on 9 zircon size fractions (1 in duplicate) of four granites. Main sample localities are indicated in fig. 6 and approximate coordinates in tables 1 and 2.