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Area of Science:

  • Earth Science
  • Geophysics
  • Geochemistry

Background:

  • Subduction zones play a critical role in Earth's deep water cycle.
  • Understanding dehydration processes is key to comprehending water transport into the mantle.

Purpose of the Study:

  • To investigate subduction zone dehydration processes and their impact on the global water cycle.
  • To model water recycling in both present-day and early Earth settings.
  • To determine how subduction parameters influence water release from slabs.

Main Methods:

  • Utilized a numerical tool combining thermo-mechanical models with a thermodynamic database.
  • Examined slab dehydration reactions under varying subduction velocities, slab ages, and mantle temperatures.
  • Developed a parameterization for water carried into the mantle (W) as a function of key subduction parameters.

Main Results:

  • Faster subducting plates dehydrate over a wider area, releasing water shallower but carrying it deeper into the mantle.
  • Identified that increases in mantle temperature, decreases in plate age, or decreases in subduction velocity similarly affect water retention in slabs.
  • Estimated that approximately 26% of global water influx is recycled into the mantle under present-day conditions.

Conclusions:

  • Deep water recycling is plausible even under early Earth conditions.
  • A scaling law was derived to quantify the flux of water recycled into the deep mantle.
  • Subduction velocity is a primary factor controlling dehydration patterns in the crust.