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Journal of the Geological Society; 1994; v. 151; issue.4; p. 615-628;
DOI: 10.1144/gsjgs.151.4.0615
© 1994 Geological Society of London

Article

40Ar/39Ar mineral age record in NE Greenland: implications for tectonic evolution of the North Atlantic Caledonides

R. D. DALLMEYER1, R. A. STRACHAN2 & N. HENRIKSEN3

1 Department of Geology, University of Georgia, Athens, GA30602, USA
2 Geology & Cartography Division, School of Construction and Earth Sciences, Oxford Brookes University, Oxford, OX3 OBP, UK
3 Geological Survey of Greenland, Øster Voldgade 10, DK 1350 Copenhagen K, Denmark

40Ar/39 Ar mineral ages have been determined from basement gneisses and cover sequences exposed in the Caledonides of NE Greenland. These range between c. 438 Ma and c. 370 Ma (early Silurian-mid-Devonian).They are interpreted as dating cooling following polyphase Caledonian metamorphism which completely reset argon systems within the (early Proterozoic) basement gneisses. The 40Ar/39 Ar results indicate that thrust-related regional deformation and metamorphism in NE Greenland continued into the early Devonian. This contrasts with Scandinavia, where nappe stacking was largely completed by the early–mid-Silurian and was followed by regional extension and tectonic unroofing in the late Silurian–mid-Devonian. Tectonic models developed for the late-orogenic evolution of the northern Atlantic Caledonides therefore need to incorporate considerable along- and across-strike variation in both the style and timing of major tectonothermal events.




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References
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