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Slab tearing and segmented subduction termination driven by transform tectonics.

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Summary
This summary is machine-generated.

Mid-ocean ridges approaching trenches cause subduction termination and slab detachment. This study reveals how transform boundaries drive laterally diachronous slab fragmentation and subduction cessation.

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Area of Science:

  • Geophysics
  • Tectonics
  • Geology

Background:

  • Subduction termination occurs when buoyant mid-ocean ridge lithosphere resists subduction, causing slab detachment and plate boundary reconfiguration.
  • The spatial and temporal dynamics of slab tearing during subduction termination are poorly understood due to limited modern examples.

Purpose of the Study:

  • To investigate an actively fragmenting subduction system at northern Cascadia's ridge-trench-fault triple junction.
  • To understand the imminent subduction termination and associated slab fragmentation processes.

Main Methods:

  • Integration of new seismic imaging with regional seismicity data.
  • Analysis of a ridge-trench-fault triple junction system.

Main Results:

  • A broad shear-zone initiated ~4 million years ago, exploiting oceanic lithosphere fabrics.
  • Progressive localization of the shear-zone into a transform boundary, severing an oceanic microplate.
  • Imaging of trench-parallel slab tears offset by the transform boundary, indicating lateral tear propagation.

Conclusions:

  • Transform boundaries drive laterally diachronous slab fragmentation and subduction termination.
  • The Cascadia subduction system provides a modern example of imminent subduction termination.
  • Slab tears facilitate microplate decoupling while allowing adjacent subduction to continue.