Abstract

Cretaceous paleomagnetic poles for South America form three distinct groups, one each for the Andes north and south of Arica (northernmost Chile) and one for the craton. Relative to the cratonal group, the northern Andean group is displaced in a counterclockwise sense and the southern Andean group in a clockwise sense. These data have been used to support a model of orodinal bending of the Andes, but distributed shear caused by oblique subduction is a more likely mechanism.

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