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

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 in...

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Bibliographic Details
Main Authors: Thórarinsson, Sigurjón B., Söderlund, Ulf, Døssing, Arne, Holm, Paul M., Ernst, Richard E., Tegner, Christian
Format: Text
Language:unknown
Published: Geological Society of London 2016
Subjects:
Geology
FOS Earth and related environmental sciences
Arctic
Arctic Ocean
Eurasia Basin
Gakkel Ridge
Greenland
North Greenland
Online Access:https://dx.doi.org/10.6084/m9.figshare.3454046
https://geolsoc.figshare.com/articles/journal_contribution/Rift_magmatism_on_the_Eurasia_basin_margin_U_Pb_baddeleyite_ages_of_alkaline_dyke_swarms_in_North_Greenland/3454046
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Summary: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.

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