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Assessing plate reconstruction models using plate driving force consistency tests.

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This summary is machine-generated.

This study introduces a new algorithm to assess geodynamic plausibility in plate reconstruction models by calculating driving forces. It reveals significant residual torques in past reconstructions, highlighting areas for model improvement.

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Area of Science:

  • Geophysics
  • Plate Tectonics
  • Geodynamics

Background:

  • Plate reconstruction models commonly use geological and geophysical data but often neglect physical plate driving forces.
  • This omission can lead to geodynamically implausible reconstructions with significant implications for Earth science research.

Purpose of the Study:

  • To develop and present a novel algorithm for calculating time-dependent plate driving forces (slab pull, ridge push, mantle drag).
  • To evaluate the residual torques in plate reconstructions and identify potential geodynamic implausibilities or knowledge gaps.

Main Methods:

  • The algorithm calculates time-dependent slab pull, ridge push (gravitational potential energy force), and mantle drag resistance.
  • It assesses residual torques required to balance plate motion based on assumed driving force relationships for topologically closed reconstructions.

Main Results:

  • Residual torques are minimal for present-day reconstructions but can be substantial (same order of magnitude as driving torques) in models from 90 to 50 million years ago.
  • Analysis of the Pacific plate demonstrates the algorithm's utility in pinpointing time periods and regions with high residual torques.

Conclusions:

  • The algorithm serves as a tool to assess and enhance plate reconstruction models using dynamic constraints.
  • Identified residual torques suggest potential geodynamic implausibility or highlight the importance of unmodeled forces like mantle flow in specific geological times.