Abstract

Grenville anorthosite more than 20 km away from the center of the Charlevoix structure appears unaffected by the deformation, and the mean remanent vector from five sites, after demagnetization, is D = 128, I = 57, k = 49, α95 = 11; pole = 7 °N Lat., 32 °W Long., δp = 12°, δm = 16°. Progressive rotation of the NRM at three sites between 15 and 20 km of the structure center is compatible with central doming; the vectors from three sites within 15 km are anomalous, possibly reflecting modification (reversal?) of the primary vector, plus considerable tectonic rotation. The NRM at one site in 'impactite' (?), radiometrically dated at 350 m.y., is n = 3, D = 337, I = 40, k = 22, α95 = 27.

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