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Reconstructing the opening of the Labrador Sea and Baffin Bay betweenGreenland and North America remains controversial. Recent seismic datasuggest that magnetic lineations along the margins of the Labrador Sea,originally interpreted as seafloor spreading anomalies, may lie within thecrust of the continent–ocean transition. These data also suggest a moreseaward extent of continental crust within the Greenland margin nearDavis Strait than assumed in previous full-fit reconstructions. Our studyfocuses on reconstructing the full-fit configuration of Greenland and NorthAmerica using an approach that considers continental deformation in aquantitative manner. We use gravity inversion to map crustal thickness acrossthe conjugate margins, and assimilate observations from available seismicprofiles and potential field data to constrain the likely extent of differentcrustal types. We derive end-member continental margin restorations followingalternative interpretations of published seismic profiles. The boundariesbetween continental and oceanic crust (COB) are restored to theirpre-stretching locations along small circle motion paths across the region ofCretaceous extension. Restored COBs are fitted quantitatively to computealternative total-fit reconstructions. A preferred full-fit model is chosenbased on the strongest compatibility with geological and geophysical data.Our preferred model suggests that (i) the COB lies oceanward of magneticlineations interpreted as magnetic anomaly 31 (70 Ma) in the Labrador Sea,(ii) all previously identified magnetic lineations landward of anomaly 27reflect intrusions into continental crust and (iii) the Ungava fault zone inDavis Strait acted as a leaky transform fault during rifting. This robustplate reconstruction reduces gaps and overlaps in Davis Strait andsuggests that there is no need for alternative models proposed forreconstructions of this area including additional plate boundaries in NorthAmerica or Greenland. Our favoured model implies that break-up and formationof continent–ocean transition (COT) first started in the southern LabradorSea and Davis Strait around 88 Ma and then propagated north and southwardsup to the onset of real seafloor spreading at 63 Ma in the Labrador Sea. InBaffin Bay, continental stretching lasted longer and actual break-up andseafloor spreading started around 61 Ma (chron 26)

Full-fit reconstruction of the Labrador Sea and Baffin Bay