Paleomagnetism of Anorthosite in Southern Norway and Comparison with an Equivalent in Quebec
Published:January 01, 1972
R. B. Hargraves, J. R. Fish, 1972. "Paleomagnetism of Anorthosite in Southern Norway and Comparison with an Equivalent in Quebec", Studies in Earth and Space Sciences, R. Shagam, R. B. Hargraves, W. J. Morgan, F. B. Van Houten, C. A. Burk, H. D. Holland, L. C. Hollister
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Paleomagnetic measurements (including alternating field demagnetization) on 16 oriented samples from five sites in the Precambrian anorthosite massif at Egersund, southern Norway, revealed a stable, consistent reversed remanent magnetization (after 150 oersted AF demagnetization, D = 315°, I = −82°, k = 92, α95 = 8°). The calculated paleomagnetic (south) pole lies at 42° N., 20° E. and is more than 45° from the pole (39° N., 40° W.) previously obtained from anorthosite of similar age at Allard Lake, Quebec. If Eurasia is fitted to North America according to the model of Bullard and others (1965), the rotated Egersund pole is at 42° N., 18° W. Allowing for the uncertainties in the data, this is not significantly different at the 5-percent level from the Allard Lake pole, and suggests that about 1,000 m.y. ago North America and Europe were contiguous as in Laurasian reconstructions.