Aeromagnetic reconnaissance of the Labrador Sea

Abstract

A total of 12 low-level aeromagnetic profiles across the Labrador Sea were recorded with digitized rubidium-vapor and fluxgate magnetometers. The resultant data are presented in the form of profiles with the regional gradient removed. There is good correlation between the anomalies on adjacent flight lines in a number of places, and the area may be divided into two zones having anomalous magnetic signatures. These zones can be followed through the central part of the Labrador Sea and are generally flanked by areas of lesser magnetic relief. The more westerly zone strikes toward Hudson Strait and appears to die out at about 59°N. The presence of the magnetic zones, marine seismic results, and the fact that five earthquakes are known to have occurred in the area between the zones are reasonably good evidence for the existence of an active buried median ridge in the Labrador Sea.