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

TY - JOUR

T1 - Rift magmatism on the Eurasia basin margin

T2 - U–Pb baddeleyite ages of alkaline dyke swarms in North Greenland

AU - Þórarinsson, Sigurjón Böðvar

AU - Söderlund, Ulf

AU - Døssing, Arne

AU - Holm, Paul Martin

AU - Ernst, Richard E.

AU - Tegner, Christian

PY - 2015/11/1

Y1 - 2015/11/1

N2 - The opening of the Arctic Ocean involved multiple stages of continental rifting and intrusion of extensive dykeswarms. To trace tectonomagmatic processes of the High Arctic, we present the first U–Pb ages for alkaline dyke swarms ofNorth 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 theEurasia Basin. The east–west dykes reflect local variations in the stress field associated with reactivated Palaeozoic faults

AB - The opening of the Arctic Ocean involved multiple stages of continental rifting and intrusion of extensive dykeswarms. To trace tectonomagmatic processes of the High Arctic, we present the first U–Pb ages for alkaline dyke swarms ofNorth 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 theEurasia Basin. The east–west dykes reflect local variations in the stress field associated with reactivated Palaeozoic faults

U2 - 10.1144/jgs2015-049

DO - 10.1144/jgs2015-049

M3 - Journal article

SN - 0016-7649

VL - 172

JO - Journal of the Geological Society

JF - Journal of the Geological Society

IS - 6

M1 - 721

ER -