Physics
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..62..321s&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 62, no. 3, March 1983, p. 321-339. Research supported by Dalhousie Un
Physics
14
Atlantic Ocean, Continental Drift, Earth Planetary Structure, Magnetic Anomalies, Ocean Bottom, Planetary Evolution, Continental Shelves, Crustal Fractures, Geochronology, Gravity Anomalies, Magnetic Signatures, Newfoundland, North America, Paleomagnetism, Portugal, Seamounts, Seismology, Spain
Scientific paper
It is pointed out that over the past 15 years there has been considerable progress in the refinement of predrift fits and seafloor spreading models of the North Atlantic. With the widespread acceptance of these basic models has come increasing interest in resolution of specific paleogeographic and kinematic problems. Two such problems are the initial position of Iberia with respect to North America and the geometry and chronology of early (pre-80 m.y.) relative motions between these two plates. The present investigation is concerned with geophysical data from numerous Bedford Institute/Dalhousie University cruises to the Newfoundland Basin which were undrtaken to determine the location of the ocean-continent boundary (OCB) and the Mesozoic spreading history on the western side. From the examination of magnetic data in the Newfoundland Basin, the OCB east of the Grand Banks is defined as the seaward limit of the 'smooth' magnetic domain which characterizes the surrounding continental shelves. A substantial improvement in Iberia-North America paleographic reconstructions is achieved.
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