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Updated: Jun 10, 2025

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Spreading ridge migration enabled by plume-ridge de-anchoring.

Ben Mather1, Maria Seton2, Simon Williams3

  • 1EarthByte Group, School of Geosciences, The University of Sydney, Sydney, NSW, Australia. ben.mather@sydney.edu.au.

Nature Communications
|October 16, 2024
PubMed
Summary
This summary is machine-generated.

Mantle plumes can anchor or de-anchor spreading ridges. High buoyancy flux plumes (>3000 kg/s) stabilize ridges, while waning flux (<1000 kg/s) can cause rapid migration, impacting plate tectonics.

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Area of Science:

  • Geophysics
  • Plate Tectonics
  • Mantle Dynamics

Background:

  • Spreading ridges are primarily influenced by subduction forces and asymmetric strain rates, explaining their migration.
  • The role of mantle plumes in the evolution of plate boundaries and spreading ridge dynamics is not well understood.

Purpose of the Study:

  • To investigate the influence of mantle plumes on the anchoring and migration of spreading ridges.
  • To explore the mechanism of plume-ridge de-anchoring and its implications for plate tectonics.

Main Methods:

  • Utilizing a numerical model of mantle convection to simulate plume-ridge interactions.
  • Analyzing the effects of varying plume buoyancy flux on spreading ridge stability.

Main Results:

  • High buoyancy flux mantle plumes (>3000 kg/s) can capture and anchor spreading ridges within a 1000 km radius.
  • Waning plume buoyancy flux (<1000 kg/s) can de-anchor ridges, leading to rapid migration when combined with asymmetric plate forces.
  • Exceptionally high buoyancy fluxes may fragment the overriding plate for enhanced plate motion.

Conclusions:

  • Plume-ridge de-anchoring is a significant mechanism influencing the evolution of plate boundaries, as potentially observed with the SE Indian Ridge and Kerguelen plume.
  • This mechanism has global implications for understanding plate motion and the dynamics of regions near mantle plumes.