Full Title: Near-Surface Geometry of the Great Abitibi Dyke, Superior Province, Canada
Compiler: Richard Ernst
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One sheet, in color, about 24" X 58", with 8-page text. From text: The Great Abitibi dyke (GAD) is one of the longest mafic dykes in the world, trending east-northeast for at least 600, and probably more than 700, km across the Abitibi belt, southeastern Superior province, Canadian Shield. Aeromagnetic, ground-magnetic, and outcrop data were used to map this dyke and to determine its near-surface geometry. The dyke has the surface shape of an extremely elongate teardrop (wide end toward the southwest), and ranges in width from 80 to 250 m. The dyke is continuous except along its mid-length, where it comprises at least 17 overlapping en echelon segments. The dip typically ranges between 70°N and 70°S but tends to be constant along segments as long as 100 km.
Published: 1/01/1991
Pages: 8 plus 1 sheet
Product Category: Maps and Charts