Analyzing Triassic and Permian Geomagnetic Paleosecular Variation and the Implications for Ancient Field Morphology

Studying paleosecular variation (PSV) can provide unique insights into the average morphology of geomagnetic field and operation geodynamo. Although recent studies have expanded our knowledge paleomagnetic behavior through late Mesozoic, relatively little is known regarding Triassic period (ca. 251.9–201.3 Ma). This study compiles first virtual pole (VGP) database for analysis PSV, as part a longer Post-Permo-Carboniferous Reversed Superchron (PCRS) time interval (265-198 VGP angular dispersion its dependence on apparent paleolatitude are compared against new PCRS compilation published PSV compilations intervals across last ∼320 Ma. We find that Post-PCRS displays near latitudinal invariance while very strong dependence. during appears indistinguishable to previously reported preceding Cretaceous Normal (Pre-CNS; 126–198 The near-constant between with significantly different polarity reversal frequencies does not support suggested relationship frequency. observed consistent results previous represents potentially over A recently approach obtain description from equatorial shows been more strongly axial dipole dominated than any since. observation may be causally linked being longest superchron in Phanerozoic timescale.