Paleomagnetism of the post-Paleozoic alkaline magmatism in the Brazilian Platform: discussing ages and plate displacements

A review of the available paleomagnetic data on the post-Paleozoic alkaline rocks in the Brazilian Platform in combination with other South American poles of same age allow the proposition of a new apparent polar wander path (APWP) revealing rotations of the plate associated with the emplacement of alkaline provinces. By means of an analysis of the magnetization polarity of the rocks some inferences of the relative ages of the igneous complexes were possible, as the investigated time interval comprises the long normal polarity interval of the Cretaceous (Cretaceous Normal Superchron). Absolute reconstructions of the drift movement of South America was achieved by means of paleomagnetic rotations and longitude control through the sea floor magnetic anomalies.