12: Crustal thickness in the Lake Superior region

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Abstract
Compilation maps of crustal time-terms and apparent thickness in the Lake Superior region reveal an area where the Moho is anomalously deep with crustal thicknesses ranging from about 45 to perhaps more than 50 km. This anomalous region is centered on the eastern and central parts of Lake Superior, on the axis of the Midcontinent Rift System. Another region of crustal thickening also occurs further west along the rift in Wisconsin, but the intervening region appears characterized by more normal crustal thicknesses of about 40 km. Seismic data from eastern Ontario indicate that a more concerted crustal seismic study of the Kapuskasing Structural Zone may be warranted.

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