The opening of the Bay of Biscay - a review

Details The opening of the Bay of Biscay - a review The opening of the Bay of Biscay - a review

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978esrv...14...35r&link_type=abstract

Earth Science Reviews, Volume 14, Issue 1, p. 35-63.

Mathematics

Logic

3

Scientific paper

The anticlockwise rotation of the Iberian Peninsula away from south Brittany during the Mesozoic has been demonstrated from palaeomagnetic data. Marine magnetic, seismic and gravity surveys have indicated that there is oceanic crust in the Bay of Biscay. Initial rifting began in the Triassic but the major part of the rotation of the Iberian Peninsula occurred during the Late Cretaceous. Two mechanisms for the opening of the Bay of Biscay have been proposed, firstly a simple anticlockwise rotation of the Iberian plate and secondly, a 350 km sinistral displacement of the Iberian plate along transform faults about a pole of rotation near Paris. Geological data, partly new, favours the first mechanism but with a pole of rotation approximately 100 km east of the west end of the Pyrenees rather than in the southeast corner of the Bay of Biscay. Geophysical data indicates a further small rotation of the Iberian Peninsula during the Late Eocene which resulted in the formation of the Pyrenees.

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