The tectonic framework of the Precambrian shield of Greenland A review of new isotopic evidence

Abstract

There is now reliable isotopic evidence that most of the crystalline basement of Greenland consists of Archaean (>2500 Ma) rocks: only in the Ketilidian mobile belt of southemmost Greenland no Archaean rocks have yet been found. Proterozoic orogenic activity was widespread in the Nagssugtoqidian and Rinkian mobile belts of central and northem West Greenland, and peaked at c. 1850 Ma. There is some evidence that the Nagssugtoqidian mobile belt may define the boundary between two once separate Archaean continental plates and it is possibie that comparable plate boundaries also exist elsewhere in Greenland.