A geophysical interpretation of structural boundaries in the Eastern Canadian Shield

• Main Author: Tanner, James Gordon
• Published: Durham University 1969
• Subjects: 557.1
• Online Access: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.585885

Between 1958 and 1965 field parties of the Dominion Observatory observed some 11,000 gravity stations in northern Quebec as part of a program to provide gravity stations at intervals of 10-15 km,throughout Canada. The measurements were carried out using float-equipped fixed wing aircraft and helicopters for transportation. The gravity measurements have been made by establishing a control network throughout northern Quebec which served as a reference for the gravity traverses. Analysis of the results indicates that the computed Bouguer anomalies in the northern part of the region are accurate to better than 3 mgal and those in the south to better than 2 mgal. The major source of error in the Bouguer anomalies is the uncertainty of the elevations of the gravity stations, most of which have been established using altimeters.