POTENTIAL-FIELD INTERPRETATION OF THE BAIE-VERTE PENINSULA, NEWFOUNDLAND, UTILIZING CONSTRAINTS FROM LITHOPROBE EAST SEISMIC LINE 89-13

An understanding of the geological setting of the Baie Verte Peninsula of Newfoundland is central to many interpretations of the Canadian Ap palachians. In this paper we present an interpretation of the magnetic and gravity data for the area utilizing constraints from Lithoprobe V ibroseis line 89-13 which traverses the peninsula. The potential field data were processed using a number of techniques to provide shaded re lief and other maps providing information on the depth of the sources. Density and magnetic susceptibility data were used in modelling the g ravity and magnetic responses for two profiles, one the Lithoprobe lin e 89-13, and the other a profile farther north. The reflection seismic section was used to constrain the modelling. The Baie Verte Line is i nterpreted to be confined to the upper few kilometers of the crust. A prominent feature on the seismic section, and its corresponding step o n the gravity and magnetic profiles, is interpreted to be the subsurfa ce westward edge of a wedge of intact ophiolitic crust found on the ea stern part of the peninsula. This feature is traced away from the seis mic line by utilizing its potential field signature. The modelling and processing suggest that the potential field signatures can all be exp lained by sources in the upper 10 km of the crust, a conclusion consis tent with earlier interpretations which were based on potential field data alone.