GEOMAGNETIC FIELD BEHAVIOUR MODEL DESCRIBING AN EXCURSION RECORDED DURING THE LATE CENOZOIC

A comparison is established between the results yielded by the palaeomagnetic study of a late Cenozoic sediment sequence (approximately 30000 years old) exposed in Argentina (33 S, 58.5 W) and a theoretical model describing the geomagnetic field behaviour. The model describes the geomagnetic field as generated by one main central dipole and eight radial dipoles, whose intensities change throughout time, there being simultaneously a longitudinal drift of the radial dipoles. The comparison suggests that the model is suitable for explaining the behaviour of the geomagnetic field during most of the recorded excursion.