Abstract
A modeling technique using spherical shell elements and equivalent dipole sources has been applied to Magsat signatures at the Churchill‐Superior boundary in Manitoba, Ontario, and Ungava. A large satellite magnetic anomaly (12 nT amplitude) on POGO and Magsat maps near the Churchill‐Superior boundary was found to be related to the Richmond Gulf aulacogen. The averaged crustal magnetization in the source region is 5.2 A m−1. Stacking of the magnetic traces from Magsat passes reveals a magnetic signature (10 nT amplitude) at the Churchill‐Superior boundary in an area studied between 80°W and 98°W. Modeling suggests a steplike thickening of the crust on the Churchill side of the boundary in a layer with a magnetization of 5 A m−1. Signatures on aeromagnetic maps are also found in the source areas for both of these satellite anomalies.
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