Assessing the GAD Hypothesis with Paleomagnetic Data from Large Proterozoic Dike Swarms
geomagnetic field geometry, Proterozoic, GAD
Digital Object Identifier (DOI)
Previous compilations of paleomagnetic studies have suggested that the Proterozoic geomagnetic field may have had as large as 12% quadrupole and 29% octupole components, relative to the dipole intensity. These values would have significant implications for geodynamo secular cooling and outer core dynamics, and for paleogeographic reconstructions. Herein we test the validity of one method, using paleomagnetic remanence of three Proterozoic large igneous provinces (LIPs), as well as younger paleomagnetic datasets, to determine zonal geomagnetic field models. Our results show that individual LIPs are not laterally widespread enough to support claims of significant global non-dipole field components in Proterozoic time. The geocentric axial dipole hypothesis remains viable for Proterozoic paleogeographic and geodynamic models.
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Citation / Publisher Attribution
Earth and Planetary Science Letters, v. 406, p. 134-141
Scholar Commons Citation
Panzik, Joseph E. and Evans, David A. D., "Assessing the GAD Hypothesis with Paleomagnetic Data from Large Proterozoic Dike Swarms" (2014). School of Geosciences Faculty and Staff Publications. 2113.