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Constraining the Range and Variation of Lithospheric Net Rotation Using Geodynamic Modeling.

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|July 22, 2022
PubMed
Summary
This summary is machine-generated.

Lithospheric net rotation (LNR) requires high viscosity variations for Earth-like values. While its evolution is unpredictable, LNR can be treated as a Gaussian variable for plate motion models.

Keywords:
geodynamicslithospheremantlenet rotationplate reconstruction

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Area of Science:

  • Geophysics
  • Solid Earth Geodynamics
  • Computational Geodynamics

Background:

  • Lithospheric net rotation (LNR) is the solid-body movement of the lithosphere relative to the mantle.
  • Distinguishing LNR from plate motion is crucial for accurate absolute plate motion models.
  • LNR is challenging to quantify due to geological data uncertainties and mantle plume reference frame stability issues.

Purpose of the Study:

  • Investigate factors controlling LNR magnitude using mantle convection simulations.
  • Assess the statistical predictability of LNR within a self-consistent convective system.
  • Provide geodynamic constraints for absolute plate motion reconstructions.

Main Methods:

  • Utilized 3D mantle convection simulations.
  • Analyzed the influence of viscosity variations, temperature dependence, continents, and transition zone gradients on LNR.
  • Examined the statistical distribution and temporal evolution of LNR.

Main Results:

  • High lateral viscosity variations are essential for Earth-like LNR values.
  • Softer slabs (lower temperature dependence of viscosity) make continental presence and transition zone viscosity gradients significant for LNR.
  • LNR evolution is unpredictable in the chaotic system, but its range follows a Gaussian distribution with a 5 Myr correlation time.

Conclusions:

  • Approximately 50 Myr of simulation data is needed to achieve a fully Gaussian distribution for LNR.
  • LNR can be statistically treated as a Gaussian variable within the timescales of absolute plate motion reconstructions.
  • This study offers a novel geodynamic constraint for improving absolute plate motion models.