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Abstract
In the Godthåbsfjord region, early Archaean Arnitsoq gneisses are found in association with the middle Archaean Nûk gneisses (McGregor, 1973). Early models of crustal evolution in the Godthåbsfjord region suggested that the Amitsoq gneisses were reworked in a major crustal accretion-differentiation event, which was marked by the injection of the voluminous Nûk gneisses (e.g. Bridgwater et al., 1974; McGregor, 1979; Moor- - bath et al., 1986). This event ,has been interpreted as having culminated in a granulite-amphibolite facies metamorphic event at c. 2800 Ma, which outlasted all significant ductile deformation (e.g. Wells, 1979; Coe, 1980).
Highlights
Proterozoic faultThe south of the area consists of polyphase, nebulitic tonalitic gneisses containing scattered inc1usions of basic rocks
Tasiusarsuaq terrane is dominated by middle Archaean unit of Amitsoq gneisses running from inner AmeragdIa gneisses affected by c. 2800 Ma granulite facies meta- eastwards along the valley of Austmannadalen, or the morphism
The Tasiusarsuaq terrane structurally over- Amitsoq gneisses east of Kapisigdlit, both described by lies the Tre Brødre terrane, which is dominated by a Allaart et al (1977)
Summary
The south of the area consists of polyphase, nebulitic tonalitic gneisses containing scattered inc1usions of basic rocks. These rocks are continuous with the Tasiusarsuaq terrane to the south and west, affected by granulite fades metamorphism at c. In the Kapisigdlit area these nebulitic gneisses with their basic inc1usions have brown-weathered patches up to 500 macross, with relict granulite fades assemblages. The gneisses ,vith their basic inc1usions adjacent to these patches have amphibolite fad,es assemblages These gneisses have blebby textures attributed to recrystalIisation under granulite fades conditions (McGregor et al, 1986). At lower altitudes on the same hills, these granulite fades gneisses are totally retrogressed under amphibolite facies conditions, with their subvertical foliation transposed into a new southerly dipping foliation
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