Rb-Sr whole-rock measurements of the Kap York meta-igneous complex, Thule district, North-West Greenland

Abstract

The Precambrian basement af the Kap York - Melville Bugt region is high-grade gneiss, composed af both orthogneisses and paragneisses, in which several units af metasedimcntary and meta-igneous rocks occur. The largest Occurrence af igneous rocks that has rctaincd magmatic aspect is the Kap York meta-igncous complcx which is composed af a rock suite af acidic to basic composition occupying thc wholc af the Kap York peninsula (fig. 8). On the Tectonic/Geological map of Greenland (Escher, 1970) the Kap York rocks were included in the Prolcrozoic Nagssugtoqidian orogenic complex which, elsewhere to the south in Greenland, yields K-Ar ages between 1790 and 1650 m.y.