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

Sigurjón B. Thórarinsson, Ulf Söderlund, Arne Døssing, Paul M. Holm, Richard E. Ernst, Christian Tegner

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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.Supplementary materials: U–Pb data are available at http://www.geolsoc.org.uk/SUP18857.
Original languageEnglish
JournalJournal of the Geological Society
Volume172
Issue number6
Pages (from-to)721-726
ISSN0016-7649
DOIs
Publication statusPublished - 2015

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