PT - JOURNAL ARTICLE AU - Mjelde, R. AU - Breivik, A.J. AU - Raum, T. AU - Mittelstaedt, E. AU - Ito, G. AU - Faleide, J.I. TI - Magmatic and tectonic evolution of the North Atlantic AID - 10.1144/0016-76492007-018 DP - 2008 Jan 01 TA - Journal of the Geological Society PG - 31--42 VI - 165 IP - 1 4099 - http://jgs.lyellcollection.org/content/165/1/31.short 4100 - http://jgs.lyellcollection.org/content/165/1/31.full SO - Journal of the Geological Society2008 Jan 01; 165 AB - The primary aim of the present paper is (1) to review the tectonomagmatic evolution of the North Atlantic, and (2) constrain evolutionary models with new lithosphere strength estimates and interpretation of potential field data north of Iceland. Our interpretations suggest that the breakup along the entire eastern Jan Mayen Ridge occurred at c. 55 Ma. Calculations of lithospheric yield strength indicate that the continental rifting in East Greenland, which led to oceanic crustal formation west of the Jan Mayen Ridge at c. 25 Ma, could have started at c. 42.5 Ma. Symmetrical V-shaped gravimetric ridges, which can be traced back to c. 48 Ma, document large-scale asthenospheric flow both north and south of Iceland. Such flow is predicted by geodynamic models of mantle plumes, but has yet to be predicted by other mechanisms. The results from the compartments north of Iceland, viewed in a regional context, strengthen the hypothesis attributing the anomalous magmatism in the North Atlantic area from c. 70 Ma to the present to the Icelandic plume.