Widespread inclination shallowing in Permian and Triassic paleomagnetic data from Laurentia: Support from new paleomagnetic data from Middle Permian shallow intrusions in southern Illinois (USA) and virtual geomagnetic pole distributions

Recent paleomagnetic work has highlighted a common and shallow inclination bias in continental redbeds. The Permian and Triassic paleomagnetic records from Laurentia are almost entirely derived from such sedimentary rocks, so a pervasive inclination error will expectedly bias the apparent polar wand...

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Veröffentlicht in:Tectonophysics 2011-10, Vol.511 (1), p.38-52
Hauptverfasser: Domeier, Mathew, Van der Voo, Rob, Denny, F. Brett
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Van der Voo, Rob
Denny, F. Brett
description Recent paleomagnetic work has highlighted a common and shallow inclination bias in continental redbeds. The Permian and Triassic paleomagnetic records from Laurentia are almost entirely derived from such sedimentary rocks, so a pervasive inclination error will expectedly bias the apparent polar wander path of Laurentia in a significant way. The long-standing discrepancy between the apparent polar wander paths of Laurentia and Gondwana in Permian and Triassic time may be a consequence of such a widespread data-pathology. Here we present new Middle Permian paleomagnetic data from igneous rocks and a contact metamorphosed limestone from cratonic Laurentia. The exclusively reversed Middle Permian magnetization is hosted by low-Ti titanomagnetite and pyrrhotite and yields a paleomagnetic pole at 56.3°S, 302.9°E (A 95 = 3.8, N = 6). This pole, which is unaffected by inclination shallowing, suggests that a shallow inclination bias may indeed be present in the Laurentian records. To further consider this hypothesis, we conduct a virtual geomagnetic pole distribution analysis, comparing theoretical expectations of a statistical field model (TK03.GAD) against published data-sets. This exercise provides independent evidence that the Laurentian paleomagnetic data is widely biased, likely because of sedimentary inclination shallowing. We estimate the magnitude of this error from our model results and present and discuss several alternative corrections. ► A new, igneous rock-based, Middle Permian paleomagnetic pole from Laurentia is presented. ► A VGP distribution analysis of published records from Laurentia is conducted. ► The new pole and VGP analysis suggest a widespread bias in Laurentian records. ► This bias is corrected and the broader implications are discussed.
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subjects Bias
Contact
Geomagnetism
Inclination
Inclination shallowing
Intrusion
Laurentian apparent polar wander path
Magnetization
Paleomagnetism applied to tectonics
Poles
Sedimentary rocks
Virtual geomagnetic pole distributions
title Widespread inclination shallowing in Permian and Triassic paleomagnetic data from Laurentia: Support from new paleomagnetic data from Middle Permian shallow intrusions in southern Illinois (USA) and virtual geomagnetic pole distributions
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