Letter | Published:

Mechanisms for oscillatory true polar wander

Nature volume 491, pages 244248 (08 November 2012) | Download Citation

Abstract

Palaeomagnetic studies1,2,3,4,5 of Palaeoproterozoic to Cretaceous rocks propose a suite of large and relatively rapid (tens of degrees over 10 to 100 million years) excursions of the rotation pole relative to the surface geography, or true polar wander (TPW). These excursions may be linked in an oscillatory, approximately coaxial succession about the centre of the contemporaneous supercontinent5,6,7. Within the framework of a standard rotational theory8,9, in which a delayed viscous adjustment of the rotational bulge acts to stabilize the rotation axis10, geodynamic models for oscillatory TPW generally appeal to consecutive, opposite loading phases of comparable magnitude6,11,12. Here we extend a nonlinear rotational stability theory10 to incorporate the stabilizing effect of TPW-induced elastic stresses in the lithosphere13,14. We demonstrate that convectively driven inertia perturbations acting on a nearly prolate, non-hydrostatic Earth6,7 with an effective elastic lithospheric thickness of about 10 kilometres yield oscillatory TPW paths consistent with palaeomagnetic inferences. This estimate of elastic thickness can be reduced, even to zero, if the rotation axis is stabilized by long-term excess ellipticity in the plane of the TPW. We speculate that these sources of stabilization, acting on TPW driven by a time-varying mantle flow field11,12,15,16,17,18, provide a mechanism for linking the distinct, oscillatory TPW events of the past few billion years.

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References

  1. 1.

    , & Coronation loop resurrected: oscillatory apparent polar wander of Orosirian (2.05–1.8 Ga) paleomagnetic poles from Slave craton. Precambr. Res. 179, 121–134 (2010)

  2. 2.

    et al. Combined paleomagnetic, isotopic, and stratigraphic evidence for true polar wander from the Neoproterozoic Akademikerbreen Group, Svalbard, Norway. Geol. Soc. Am. Bull. 118, 1099–1124 (2006)

  3. 3.

    , & Rapid Early Cambrian rotation of Gondwana. Geology 38, 755–758 (2010)

  4. 4.

    True polar wander during the middle Paleozoic? Earth Planet. Sci. Lett. 122, 239–243 (1994)

  5. 5.

    & Absolute plate motions and true polar wander in the absence of hotspot tracks. Nature 452, 620–623 (2008)

  6. 6.

    True polar wander, a supercontinental legacy. Earth Planet. Sci. Lett. 157, 1–8 (1998)

  7. 7.

    True polar wander and supercontinents. Tectonophysics 362, 303–320 (2003)

  8. 8.

    Instability of the Earth’s axis of rotation. Nature 175, 526–529 (1955)

  9. 9.

    & Some remarks on polar wandering. J. Geophys. Res. 74, 2555–2567 (1969)

  10. 10.

    , & Polar wandering of a dynamic Earth. Geophys. J. Int. 113, 284–298 (1993)

  11. 11.

    Upwelling plumes, superswells and true polar wander. Geophys. J. Int. 159, 1125–1137 (2004)

  12. 12.

    & Toward an explanation for the present and past locations of the poles. Geochem. Geophys. Geosyst. 11, Q06W06 (2010)

  13. 13.

    Reorientation of planets with elastic lithospheres. Icarus 60, 701–709 (1984)

  14. 14.

    , , , & Rotational stability of dynamic planets with elastic lithospheres. J. Geophys. Res. 111, E02003 (2006)

  15. 15.

    , & Excitation of true polar wander by subduction. Nature 360, 452–454 (1992)

  16. 16.

    , & Mantle dynamics, geoid, inertia and TPW since 120 Myr. Earth Planet. Sci. Lett. 292, 301–311 (2010)

  17. 17.

    , , & Polar wandering in mantle convection models. Geophys. Res. Lett. 26, 1777–1780 (1999)

  18. 18.

    Simultaneous generation of hotspots and superswells by convection in a heterogeneous planetary mantle. Nature 402, 756–760 (1999)

  19. 19.

    & Seismic imaging of structural heterogeneity in Earth's mantle: evidence for large-scale mantle flow. Sci. Prog. 83, 243–259 (2000)

  20. 20.

    , , & A model for the evolution of the Earth’s mantle structure since the Early Paleozoic. J. Geophys. Res. 115, B06401 (2010)

  21. 21.

    , , , & The rotational stability of a convecting Earth: assessing inferences of rapid TPW in the Late Cretaceous. Geophys. J. Int. 187, 1319–1333 (2011)

  22. 22.

    & Numerical investigation of layered convection in a three-dimensional shell with application to planetary mantles. Geochem. Geophys. Geosyst. 5, Q12C04 (2004)

  23. 23.

    , , & Supercontinent cycles, true polar wander, and very long-wavelength mantle convection. Earth Planet. Sci. Lett. 261, 551–564 (2007)

  24. 24.

    & in Ice Sheets, Sea Level and the Dynamic Earth (eds & ) 233–256 (AGU, Geodynamics Series 29, 2002)

  25. 25.

    & Theoretical constraints on true polar wander. J. Geophys. Res. 112, B05415 (2007)

  26. 26.

    et al. Phanerozoic polar wander, palaeogeography. Earth Sci. Rev. 114, 325–368 (2012)

  27. 27.

    , & Flattening of the Earth: further from hydrostaticity than previously estimated. Geophys. J. Int. 183, 727–732 (2010)

  28. 28.

    & A new inference of mantle viscosity based upon a joint inversion of convection and glacial isostatic adjustment data. Earth Planet. Sci. Lett. 225, 177–189 (2004)

  29. 29.

    , & On the relative influence of thermal and water cycles on planetary dynamics. Earth Planet. Sci. Lett. 310, 380–388 (2011)

  30. 30.

    Isostasy and Flexure of the Lithosphere (Cambridge Univ. Press, 2001)

  31. 31.

    , , , & Diamonds sampled by plumes from the core-mantle boundary. Nature 466, 352–355 (2010)

  32. 32.

    , & Mantle anchor structure: an argument for bottom-up tectonics. Earth Planet. Sci. Lett. 299, 69–79 (2010)

  33. 33.

    , & True polar wander affects the Earth dynamic topography and implies a highly viscous lower mantle. Geophys. Res. Lett. 21, 137–140 (1994)

  34. 34.

    Theoretical Hydrodynamics 743 (Courier Dover, 1996)

  35. 35.

    & Viscous flow models of global geophysical observables: 1. Forward problems. J. Geophys. Res. 96, 20131–20159 (1991)

  36. 36.

    Constraints on seismic models from other disciplines—implications for mantle dynamics and composition. Treat. Geophys. 1, 805–858 (2007)

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Acknowledgements

We thank D. Evans, T. Torsvik and B. Steinberger for comprehensive and constructive reviews; A. Forte for providing us with geoid kernels; and C. Hay, N. Gomez, E. Morrow and A. Wickert for assistance with figures. We also thank A. Maloof, R. van der Voo, A. Watts, P. Hoffman, G. Spada, R. Mitchell, S. Stanley, S. Zhong, V. Tsai, D. Rowley and N. Swanson-Hysell for critical discussions; and D. Johnston and A. Knoll for reading of the manuscript. We acknowledge support from the Canadian Institute for Advanced Research and Harvard University.

Author information

Affiliations

  1. Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA

    • J. R. Creveling
    • , J. X. Mitrovica
    •  & N.-H. Chan
  2. Department of Physics, University of Toronto, Toronto M5S 1A7, Canada

    • K. Latychev
  3. Department of Planetary Sciences, Lunar and Planetary Laboratory, University of Arizona, Tucson, Arizona 85721, USA

    • I. Matsuyama

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Contributions

J.R.C. developed the conceptual idea for the study. All authors contributed to the technical analysis and the writing of the paper.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to J. R. Creveling.

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    Supplementary Information

    This file contains Supplementary Text, Supplementary Figures 1-5 and Supplementary References. This file was replaced on 03 May 2013, as Supplementary Figure 2 had corrupted in the original file posted online.

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https://doi.org/10.1038/nature11571

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