True polar wander associated with continental drift on a hypothetical Earth
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Open Access
- 27 June 2007
- journal article
- Published by Springer Nature in Earth, Planets and Space
- Vol. 59 (6) , 513-522
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.Keywords
This publication has 36 references indexed in Scilit:
- Upwelling plumes, superswells and true polar wanderGeophysical Journal International, 2004
- Apparent and true polar wander and the geometry of the geomagnetic field over the last 200 MyrJournal of Geophysical Research, 2002
- Postglacial rebound and sea level contributions to changes in the geoid and the Earth's rotation axisGeophysical Journal International, 1999
- Revised and synthetic apparent polar wander paths of the African, Eurasian, North American and Indian Plates, and true polar wander since 200 MaJournal of Geophysical Research, 1991
- Continental hypsographyTectonics, 1983
- Preliminary reference Earth modelPhysics of the Earth and Planetary Interiors, 1981
- Continental drift and true polar wanderingGeophysical Journal International, 1979
- Secular trend of the Earth's rotation pole: Consideration of motion of the latitude observatoriesGeophysical Journal International, 1977
- Some remarks on polar wanderingJournal of Geophysical Research, 1969
- Instability of the Earth's Axis of RotationNature, 1955