Reconstructions of the continents around the North Atlantic at about the 60th parallel

Details Reconstructions of the continents around the North Atlantic at about the 60th parallel Reconstructions of the continents around the North Atlantic at about the 60th parallel

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001e%26psl.187...55t&link_type=abstract

Earth and Planetary Science Letters, Volume 187, Issue 1-2, p. 55-69.

Mathematics

Logic

57

Scientific paper

Late Carboniferous-Early Tertiary apparent polar wander (APW) paths (300-40 Ma) for North America and Europe have been tested in various reconstructions. These paths demonstrate that the 500 fathom Bullard et al. fit is excellent from Late Carboniferous to Late Triassic times, but the continental configuration in northern Pangea changed systematically between the Late Triassic (ca. 214 Ma) and the Mid-Jurassic (ca. 170 Ma) due to pre-drift extension. Best fit North Atlantic reconstructions minimize differences in the Late Carboniferous-Early Jurassic and Late Cretaceous-Tertiary segments of the APW paths, but an enigmatic difference exists in the paths for most of the Jurassic, whereas for the Early Cretaceous the data from Europe are nearly non-existent. Greenland's position is problematic in a Bullard et al. fit, because of a Late Triassic-Early Jurassic regime of compression (>300 km) that would be inherently required for the Norwegian Shelf and the Barents Sea, but which is geologically not defensible. We suggest a radically new fit for Greenland in between Europe and North America in the Early Mesozoic. This fit keeps Greenland `locked' to Europe for the Late Paleozoic-Early Mesozoic and maintains a reconstruction that better complies with the offshore geological history of the Norwegian Shelf and the Barents Sea. Pre-drift (A24) extension amounted to approximately 450 km on the Mid-Norwegian Shelf but with peak extension in the Late Cretaceous.

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