Combined paleomagnetic, isotopic, and stratigraphic evidence for true polar wander from the Neoproterozoic Akademikerbreen Group, Svalbard, Norway

TitleCombined paleomagnetic, isotopic, and stratigraphic evidence for true polar wander from the Neoproterozoic Akademikerbreen Group, Svalbard, Norway
Publication TypeJournal Article
Year of Publication2006
AuthorsMaloof A.C, Halverson G.P, Kirschvink J.L, Schrag D.P, Weiss B.P, Hoffman P.F
JournalGSA Bulletin
Volume118
Issue9-10
Pagination1099 - 1124
Date Published09/10/2006
ISBN Number0016-7606
Other Numbers09Maloof
Abstract

We present new paleomagnetic data from three Middle Neoproterozoic carbonate units of East Svalbard, Norway. The paleomagnetic record is gleaned from 50 to 650 m of continuous, platformal carbonate sediment, is reproduced at three locations distributed over >100 km on a single craton, and scores a 5–6 (out of 7) on the Van der Voo (1990) reliability scale. Two >50° shifts in paleomagnetic direction are coincident with equally abrupt shifts in δ13C and transient changes in relative sea level. We explore four possible explanations for these coincidental changes: rapid plate tectonic rotation during depositional hiatus, magnetic excursions, nongeocentric axial-dipole fields, and true polar wander. We conclude that the observations are explained most readily by rapid shifts in paleogeography associated with a pair of true polar wander events. Future work in sediments of equivalent age from other basins can test directly the true polar wander hypothesis because this type of event would affect every continent in a predictable manner, depending on the continent's changing position relative to Earth's spin axis.

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URLhttps://doi.org/10.1130/B25892.1
DOI10.1130/B25892.1
Short TitleGSA Bulletin