Programme of geochronology and isotope geochemistry in the Ammassalik region, South-East Greenland: outline and preliminary results

Abstract

Geological investigation of the Ammassalik region in the summer of 1986 included the collection of sample suites for isotopic dating. This report sets out the plans for future dating work, and presents some preliminary results on sample suites collected in 1986 and on earlier expeditions to the region. From the data now available it is clear that crustal evolution commenced during the Archaean and that further additions to the crust took place during early-to-mid-Proterozoic tectonothermal events. Some features of the geology of the Ammassalik region may be attributable to the collision of two Archaean continental blocks.