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Related Experiment Videos

Diffuse fluid flux through orogenic belts: implications for the world ocean.

Steven E Ingebritsen1, Craig E Manning

  • 1U.S. Geological Survey, Menlo Park, CA 94025, USA.

Proceedings of the National Academy of Sciences of the United States of America
|June 26, 2002
PubMed
Summary
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Earth

Area of Science:

  • Geoscience
  • Geochemistry
  • Tectonics

Background:

  • Volcanic outgassing was the long-accepted theory for seawater origin.
  • Recent studies indicate subduction rates exceed volcanic outgassing, challenging existing models.
  • This creates a mass-balance problem for ocean water volume and origin.

Purpose of the Study:

  • To investigate mechanisms for water return from subducting lithosphere.
  • To identify alternative pathways for oceanic water to reach the surface.
  • To resolve the discrepancy between water subduction and outgassing rates.

Main Methods:

  • Analysis of crustal permeability in tectonically active regions.
  • Modeling of water upflow through continental crust.
  • Investigating metamorphic processes as a degassing pathway.

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Main Results:

  • Crustal permeability allows significant water upflow in active continental crust.
  • A previously unrecognized degassing pathway exists.
  • This pathway can balance the rate of water subduction.

Conclusions:

  • Recycled water can escape the mantle through active metamorphism.
  • This mechanism resolves the mass-balance issue for ocean water.
  • It negates the need for decreasing ocean volume or cometary impacts.