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Slab underthrusting is the primary control on flat-slab size.

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This summary is machine-generated.

Flat slab subduction expansion is primarily driven by the forward propagation of the flat-slab hinge, not just trenchward continental motion. This research offers a new framework for understanding this dynamic geological process.

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Area of Science:

  • Geology
  • Tectonics
  • Geophysics

Background:

  • Flat subduction is a key process at active continental margins, but its expansion mechanisms are not fully understood.
  • Current models often attribute flat-slab expansion to trenchward continental motion driving overthrusting.

Purpose of the Study:

  • To investigate the mechanisms driving the expansion of flat subduction zones.
  • To evaluate the competing hypotheses of continental motion-driven overthrusting versus hinge propagation.

Main Methods:

  • Kinematic analysis of trench and flat-slab motions using a global flat subduction database.
  • Comparison of results across multiple absolute plate motion models.
  • Validation through numerical modeling.

Main Results:

  • Flat-slab expansion is primarily driven by the forward propagation of the flat-slab hinge.
  • Distinct end-member processes contribute to flat-slab expansion, with hinge propagation being dominant.
  • A new framework for flat-slab propagation is proposed, highlighting lower-plate motion and adjacent slab pull.

Conclusions:

  • The dominant mechanism for flat-slab expansion is the forward propagation of the flat-slab hinge.
  • Lower-plate kinematics and inter-plate dynamics play a crucial role in flat-slab behavior.
  • This study challenges existing assumptions and necessitates a re-evaluation of flat-slab dynamics.