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Open Access

True polar wander associated with continental drift on a hypothetical Earth

Earth, Planets and Space200759:BF03352714

https://doi.org/10.1186/BF03352714

Received: 23 May 2006

Accepted: 11 April 2007

Published: 27 June 2007

Abstract

Long-term true polar wander of the Earth (TPW) has generally been discussed by taking into account con-vective processes in the mantle such as downgoing slabs and upwelling plumes. Here I examined a relationship between continental drift and TPW on a hypothetical Earth with no such convective processes in the mantle. I evaluated temporal changes in moments of inertia owing to continental drift during a period of ~250 Ma based on a paleogeographic reconstruction, in which I estimated the lateral density heterogeneities by factoring in the observed mean land elevation of continents and average age of the oceanic lithosphere. The predictions for a viscoelastic Earth model with plausible viscosity models indicate that the long-term TPW might have been affected by continental drift throughout Cenozoic and Mesozoic times, which has wholly proceeded by maintaining isostasy at a certain depth, as well as convective processes in the mantle.

Key words

Earth’s rotation, true polar wandercontinental driftMaxwell viscoelasticityviscosityLove number

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