Abstract
A comparison of induction arrows calculated from analogue model and field station measurements is reported for fifteen locations in the Newfoundland region of Atlantic Canada. The comparison is made at four periods 100s, 300s, 900s, and 1800s. The differences between the total induction response as represented by the field results and part of the induction response due to the conductive ocean alone as represented by the model results are presented in the form of difference induction arrows. These difference arrows are representative of the anomalous conductivity associated with the tectonic features of the region. The major tectonic structures identified as contributing to the anomalous response in Newfoundland are the Carboniferous sedimentary basins both onshore and in the Gulf of St. Lawrence and a conductive feature in eastern Newfoundland probably associated with the ancient margin of the proto-Atlantic Iapetus Ocean. There is also a suggestion that the crustal conductive zone underlying the Nova Scotian Shelf extends to the Grand Banks off Newfoundland.
