Mesoproterozoic geomagnetic reversal asymmetry in light of new paleomagnetic and geochronological data for the Häme dyke swarm, Finland: Implications for the Nuna supercontinent
A new paleomagentic pole at 23.6°N, 209.8°E has been obtained for Häme dykes. Precise U-Pb ages of 1642 ± 2 Ma and 1647 ± 14 Ma for two reversely magnetized dykes are acquired. The pole is used to fix the core of the Nuna supercontinent on shallow latitudes. The Geocentric Axial Dipole model of the geomagnetic field is supported at 1.7–1.4 Ga.