Consistent and Contrasting Aspects of the Geomagnetic Field Across Epochs With Distinct Reversal Frequencies Revealed by Modeling the Kiaman Superchron

Abstract

The study of the geomagnetic field on a geological timescale brings imperative links to investigating the ancient deep Earth, particularly in understanding of the behavior of the field with regard to the polarity changes. Throughout the Earth's history, the field polarity has changed continuously, intercalating periods of relatively high-frequency polarity changes and others with practically no changes. Long time intervals comprising tens of million years of a single polarity define the superchrons. Three superchrons have been recognized in the Phanerozoic: the Moyero Superchron of reversed polarity during the Ordovician (

On Pole Position: Causes of Dispersion of the Paleomagnetic Poles Behind Apparent Polar Wander Paths

“…VGP‐based APWPs have been constructed before, for example, Australia (Hansma & Tohver, 2020; McElhinny et al., 1974), Iberia (van Hinsbergen et al., 2017), and Laurentia (Swanson‐Hysell et al., 2019), and for all major continents by McElhinny and McFadden (2000). Also, paleomagnetic data from different studies and locations have been combined on the VGP level in studies of geomagnetic field behavior (e.g., Brandt et al., 2021; Cromwell et al., 2018). Calculating APWPs from VGPs poses several challenges, however.…”

Influence of Data Filters on the Position and Precision of Paleomagnetic Poles: What Is the Optimal Sampling Strategy?

“…This data set contains lavas from the Permo‐Carboniferous Reversed Superchron (PCRS). Interestingly, the between‐site scatter is much lower than for the other three localities (Brandt et al., 2021; Handford et al., 2021). The within‐site scatter of this data set, however, is higher.…”

On pole position: causes of dispersion of the paleomagnetic poles behind apparent polar wander paths

“…VGP-based APWPs have been constructed before, for example, Australia (Hansma & Tohver, 2020;McElhinny et al, 1974), Iberia (van Hinsbergen et al, 2017), andLaurentia (Swanson-Hysell et al, 2019), and for all major continents by McElhinny and McFadden (2000). Also, paleomagnetic data from different studies and locations have been combined on the VGP level in studies of geomagnetic field behavior (e.g., Brandt et al, 2021;Cromwell et al, 2018). Calculating APWPs from VGPs poses several challenges, however.…”