2 ARCHEAN GRANULITE-FACIES METAMORPHIC EVENTS IN THE NUUK-MANIITSOQ REGION, SOUTHERN WEST GREENLAND - CORRELATION WITH THE SAGLEK BLOCK, LABRADOR

Two different granulite-facies events have been identified using SHRIM P U-Pb zircon geochronology in the Nuuk-Maniitsoq tract of West Greenl and, previously considered to comprise a continuous, contemporaneous g ranulite facies terrain. About 35 km north of Nuuk, a granulite-facies metasediment contains metamorphic zircon overgrowths recording a Pb-2 07/Pb-206 age of 2999 +/- 4 Ma (2sigma). Some 130 km further north, ne ar Maniitsoq, an orthopyroxene-bearing granite contains metamorphic zi rcons recording an age of 2738 +/- 6 Ma. Previous correlations have li nked the early Archaean rocks of the Saglek block of northern Labrador with those in the Nuuk region. However, this causes problems with cor relation of crustal blocks on either side of the Labrador Sea. The pro posal here, of correlating late Archaean metamorphic events at 2740 Ma , provides a better solution to the problem.