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What drives tectonic plates?

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This summary is machine-generated.

Earth's mantle and tectonic plates are a single system. Subducting plates drive plate movement, influencing continental drift and tearing continents apart over geological time scales.

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Area of Science:

  • Geophysics
  • Tectonophysics
  • Earth System Science

Background:

  • The long-standing debate on whether Earth's mantle drives tectonic plates or vice versa.
  • The conceptualization of the lithosphere and mantle as separate entities versus a single self-organizing system.

Purpose of the Study:

  • To investigate the dynamic balance between tectonic plates and mantle flow.
  • To determine the spatial wavelengths at which these processes operate.
  • To model mantle convection with realistic tectonic behavior over supercontinent cycles.

Main Methods:

  • Development of dynamic models of mantle convection.
  • Incorporation of realistic tectonic behaviors, including supercontinent cycles.
  • Analysis of the interplay between slab dynamics and continental drift.

Main Results:

  • Subducting slabs are found to be the primary drivers of plate motion, pulling plates at rapid rates.
  • Continental keels significantly slow drift only when detached from subducting plates.
  • Tectonic tessellation exhibits greater variability than mantle flow.

Conclusions:

  • Plate tectonics and mantle convection should be viewed as a single, self-consistent system.
  • The dynamic balance between plates and mantle is not static and changes over long-term tectonic reorganizations.
  • Understanding the spatial scales of these interactions is crucial for comprehending Earth's dynamic processes.