Abstract
During the 1969 geological expedition to Scoresby Sund, a small migmatite area on the south-west peninsula of island no. 1 of the Bjørneøer (71°08'44"N/25°20' 56"W - see fig. 1) was mapped and sampled in detail. More than 2000 kg of rock were collected for petrographic and isotope geochemical investigations to give an insight into the nature of rock-forming processes induced by high-grade regional metamorphism. The restriction to a very limited sampling area (700 m × 200 m) provided rock samples which were subjected to very similar P-T conditions for at least part of their history. This report presents preliminary results obtained by the comparison of U-Pb systematics of accessory minerals from various rock phases.
Highlights
The age of 445±10 m. y. obtained for the nearly concordant monazites from the leucocratic variety o/ the grey granite and from the young granite dyke indicates the end of the Caledonian high-grade metamorphism
A biotite K/Ar age of 435±12 m. y. obtained from an intrusive dioritic rock collected on the coast of Renland opposite BjørneØer (Larsen, 1969), is compatibIe with the monazite age
Summary
Y. obtained for the nearly concordant monazites from the leucocratic variety o/ the grey granite and from the young granite dyke indicates the end of the Caledonian high-grade metamorphism.
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