Abstract

Remanent magnetization measurements on 200 oriented samples from Keweenawan gabbro, diabase, and associated rocks in the Duluth area show a clustering of directions west-northwestward and downward. Remanent magnetization is important in all the rocks studied. Q values range from 0.3 to 75, but are less than 1.0 in only 15 samples. Average volume magnetic susceptibility ranges from 0.3 to 6.0.10 (super -3) cgs. There is no apparent correlation between magnetic susceptibility and direction of remanent magnetization. A Keweenawan pole at lat 30 degrees -34 degrees N., long 175 degrees -180 degrees W. is indicated.

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