Palaeomagnetists' basic assumption that Earth's magnetic field is a GAD, that is, a geocentric axial dipole, has been challenged by anomalous magnetic data from ancient Canadian basalts. At a closer look, fast continental drift could explain this anomaly.
机构:
Univ Virginia, Dept Engn Syst & Environm, Charlottesville, VA 22904 USA
NASA, Ames Res Ctr, Mountain View, CA USAUniv Virginia, Dept Engn Syst & Environm, Charlottesville, VA 22904 USA