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The opening of the Arctic Ocean involved multiple stages of continental rifting and intrusion of extensive dyke swarms. To trace tectonomagmatic processes of the High Arctic, we present the first U-Pb ages for alkaline dyke swarms of North Greenland. Concordia ages of 80.8 +/- 0.6 and 82.1 +/- 1.5 Ma indicate that north-south and east-west dykes are coeval. The north-south dykes reflect initial east-west rifting that led to break-up along the Gakkel Ridge and formation of the Eurasia Basin. The east-west dykes reflect local variations in the stress field associated with reactivated Palaeozoic faults

Rift magmatism on the Eurasia basin margin: U–Pb baddeleyite ages of alkaline dyke swarms in North Greenland