THE CORRECTION OF TRM DEVIATION INDUCED BY AMS AND ITS APPLICATION

Based on that the order of magnitude of the anisotropy eigenvalue rati os of thermal remanent magnetization (TRM) is expected to be the squar e of the principal susceptibility ratios in anisotropic multidomain ma gnetic assemblages, a concrete correction formula is derived in this p aper, which can be used to correct the TRM deviation induced by the an isotropy of magnetic susceptibility (AMS) away from the ambient field, and successfully applied to the practical paleomagnetic researches in Yueshan diorite (China) and Flamanville granite (France). An interest ing discovery is that TRM direction is deflected away from that of the paleofield in each site. In contrast, the overall mean TRM direction is quite a good estimation of the paleofield direction, because the ma jor axis of susceptibility ellipsoid are in the radial distribution.