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Fluid processes in subduction zones.

S M Peacock

    Science (New York, N.Y.)
    |April 20, 1990
    PubMed
    Summary
    This summary is machine-generated.

    Fluids released from subducting plates significantly influence subduction zones and arc magmatism. Their production and migration control geological processes and melting in the Earth

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    Area of Science:

    • Geosciences
    • Geochemistry
    • Tectonics

    Background:

    • Fluids are crucial in subduction zones, impacting thermal and rheological evolution.
    • Pore waters and CH(4)-H(2)O fluids at shallow depths influence accretionary prisms and deep-sea ecosystems.
    • Deeper metamorphic reactions release H(2)O and CO(2), altering mantle wedge composition and triggering melting.

    Purpose of the Study:

    • To investigate the critical role of fluids in subduction zones and arc magmatism.
    • To constrain the location and consequences of fluid production using phase diagrams and thermal models.

    Main Methods:

    • Analysis of phase diagrams for relevant bulk compositions.
    • Numerical heat-transfer modeling to predict pressure-temperature-time paths.
    • Integration of fluid and rock behavior under subduction conditions.

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    Main Results:

    • Shallow fluid expulsion affects accretionary prism evolution and provides nutrients.
    • Deep fluid release alters mantle wedge composition and can induce partial melting.
    • Partial melting of amphibole-bearing oceanic crust is time-limited in young subduction zones.

    Conclusions:

    • Fluid production and migration are key drivers of geological processes in subduction zones.
    • In cooler subduction zones, mantle wedge melting is primarily driven by fluid infiltration.
    • Understanding fluid behavior is essential for comprehending arc magmatism and subduction zone dynamics.