Crustal transition between continental and oceanic domains along the North Iberian margin from wide angle seismic and gravity data (original) (raw)

Deep crustal features of the transition between the 2. Geotectonic Setting Noah Iberian mainland and the Bay of Biscay are constrained from new wide-angle seismic and gravity data. Velocity-depth The V-shaped Bay of Biscay formed as one of the arms of the models are derived from far-offset recordings onshore of two N-S North Atlantic rift system during the Mesozoic rupture between marine profiles, complemented with new refraction data inland Europe and Noah America. Models that invoke a counterand tested against models that fit the gravity anomalies. Important clockwise rotation of Iberia with respect to the Eurasia and Africa lateral variations are inferred along the Noah Iberian margin. In plates in Mesozoic and Tertiary times [see in Sibuet, 1989] involve the western transect, a Variscan crust is documented from the sea-floor spreading in the Bay of Biscay simultaneously with mainland across the continental shelf, and a rapid crustal thinning compression in the eastern Pyrenees. Magnetic anomalies led beneath the slope marks the transition to the oceanic domain. The Roest and Srivastava [ 1991 ] to propose a kinematic model with a eastern transect shows an outstanding crustal thickening beneath plate boundary that jumped from the Bay of Biscay (prior to the coastline (Moho depths around 50 km) and a gradual thinning anomaly 34) to the NI margin (between anomalies 21 and 13) and across the shelf. Differences are related to the V-shape of the Bay later on, to the Azores-Gibraltar fracture zone.