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Terrane accretion explains thin and hot ocean-continent back-arcs.

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Terrane accretion, not mantle removal or back-arc extension, explains hot ocean-continent back-arcs. This process creates weak back-arcs with continental crust atop hot mantle, resolving a long-standing geological enigma.

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Area of Science:

  • Geophysics and Tectonics
  • Earth Sciences
  • Geodynamics

Background:

  • Hot ocean-continent back-arc regions exhibit enigmatic characteristics: thin mantle lithosphere and high surface heat flow.
  • Existing explanations, such as mantle lithosphere removal or back-arc extension, are insufficient or lack clear causal mechanisms for widespread thinning.
  • Many such systems share a history of terrane accretion, a factor often overlooked in previous models.

Purpose of the Study:

  • To investigate the role of terrane accretion in explaining the formation of hot ocean-continent back-arc regions.
  • To test the hypothesis that terrane accretion can account for the observed thin mantle lithosphere and high heat flow.
  • To provide a unified explanation for the key features of these enigmatic geological settings.

Main Methods:

  • Utilized advanced thermomechanical model experiments to simulate geological processes.
  • Focused on modeling the effects of terrane accretion within ocean-continent subduction systems.
  • Compared model outcomes with observational data from real-world geological settings.

Main Results:

  • Thermomechanical models demonstrate that terrane accretion consistently explains the observed characteristics of hot back-arc regions.
  • Terrane accretion naturally leads to the development of rheologically weak back-arcs.
  • This process results in continental crust positioned directly above hot sublithospheric mantle.

Conclusions:

  • Terrane accretion offers a robust and unifying explanation for the enigmatic features of hot ocean-continent back-arc regions.
  • The proposed mechanism resolves the limitations of previous theories involving mantle removal or insufficient back-arc extension.
  • This finding highlights the critical importance of accretionary processes in shaping subduction zone geodynamics.