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Rheology of the continental lithosphere inferred from sedimentary basins

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  • Robert Newman

    (University of Cambridge)

  • Nicky White

    (University of Cambridge)

Abstract

The steady-state flow properties of the continental lithosphere play an important role in a wide range of geological processes1. A complete dynamic description of lithospheric deformation requires information about the magnitude of driving forces and the rheology of the crust and lithospheric mantle, about which there is little agreement2–6. Here we constrain these properties by analysing variations in strain rate during the extension of continental lithosphere. We determine the temporal variation of strain rate from the subsidence curves of a global sample of Phanerozoic sedimentary basins. The peak strain rate and final strain estimated from these strain-rate histories suggest that the cessation of extension is governed by cooling and concomitant strengthening of the underlying lithospheric mantle. Dynamic modelling of these data indicates that the rheology of the lithosphere is controlled by power-law creep with a stress exponent of three and an activation energy of ∼500kj mol–1. This rheology is consistent with that inferred from laboratory experiments on dry olivine7 extrapolated to lithospheric conditions.

Suggested Citation

  • Robert Newman & Nicky White, 1997. "Rheology of the continental lithosphere inferred from sedimentary basins," Nature, Nature, vol. 385(6617), pages 621-624, February.
    • Handle: RePEc:nat:nature:v:385:y:1997:i:6617:d:10.1038_385621a0
    DOI: 10.1038/385621a0
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