Rinkian mobile belt of West Greenland

In previous reviews of the Precambrian of Greenland the whole of the Precambrian of West Greenland north of the Archaean block was said to belong to a single Lower Proterozoic complex - the Nagssug toqidian complex. However, during recent compila tion of 1:500 000 maps it became clear that there is a marked difference in structural style between the Nagssugtoqidian south of Jakobshavn and the Precambrian terrain to the north. The southern region is characterised over wide areas by a fairly regular ENE trend and steep dips, while north of Jakobshavn, at least as far north as Melville Bugt, there is no obvious regional strike, dips are generally low, and the most obvious structures are large domes. On account of this structural contrast the Precambrian north of Jakobshavn is no longer included in the Nagssugtoq idian, but is referred to as the Rinkian mobile belt. The boundary between the Nagssugtoqidian and the Rinkian mobile belts coincides with an important sinistral transcurrent fault zone at Pakitsoq, directly north of Jakobshavn (fig. 101).