Abstract
The Fiskenæsset complex in southern West Greenland is part of the North Atlantic craton and is a layered intrusion consisting of gabbro, ultramafic and anorthositic rocks that was deformed during multiple episodes of folding and metamorphism (Myers 1985). We collected late-stage magmatic hornblenditic dykes and adjacent anorthosites and studied these samples integratively with several in situ techniques to determine the igneous and metamorphic history of the Fiskenæsset complex. The work presented here is part of an ongoing joint project between the Greenland Bureau of Minerals and Petroleum and the Geological Survey of Denmark and Greenland (GEUS). Here we report on new radiometric ages and mineral chemistry data from anorthosites from the North Atlantic craton in southern West Greenland (Fig. 1).
Highlights
Was deformed during multiple episodes of folding and metamorphism (Myers 1985)
The zircons were erals and Petroleum and the Geological Survey of Denmark hand-picked from the heavy mineral fraction, mounted in and Greenland (GEUS)
North Atlantic craton in southern West Greenland (Fig. 1). ing an Element2 and NewWave 213 nm UV-laser system at GEUS following the procedures described in Frei & Gerdes
Summary
Scherstén 2008) that typically occur as felsic sheets intruded parallel to the Glacier Quaternary. Age ±2sd fraction ±2sd 2.720 28 0.04 0.06 2.872 5 0.56 0.22 2.919 7 0.40 --relative misfit = 0.679. Hand-picked grains there appear to be two populations, one at 2.92 Ga and another at 2.87 Ga (Fig. 2A). 2.70 Ga might represent a minor population of metamorphic grains. A known thermal event at 2.80 Ga involving granulite-facies metamorphism that affected the western part of the Fiskenæsset complex and the intrusion of the Ilivertalik granite Scherstén, unpublished data) is not recorded among the dated zircon grains from Majaqqap Qaava
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