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      Observations at convergent margins concerning sediment subduction, subduction erosion, and the growth of continental crust

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      Reviews of Geophysics

      American Geophysical Union (AGU)

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          Most cited references 49

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          Present-day plate motions

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            Relations among subduction parameters

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              Fluid processes in subduction zones.

               S A Peacock (1990)
              Fluids play a critical role in subduction zones and arc magmatism. At shallow levels in subduction zones (<40 kilometers depth), expulsion of large volumes of pore waters and CH(4)-H(2)O fluids produced by diagenetic and low-grade metamorphic reactions affect the thermal and rheological evolution of the accretionary prism and provide nutrients for deep-sea biological communities. At greater depths, H(2)O and CO(2) released by metamorphic reactions in the subducting oceanic crust may alter the bulk composition in the overlying mantle wedge and trigger partial melting reactions. The location and conse-quences of fluid production in subduction zones can be constrained by consideration of phase diagrams for relevant bulk compositions in conjunction with fluid and rock pressure-temperature-time paths predicted by numerical heat-transfer models. Partial melting of subducting, amphibole-bearing oceanic crust is predicted only within several tens of million years of the initiation of subduction in young oceanic lithosphere. In cooler subduction zones, partial melting appears to occur primarily in the overlying mantle wedge as a result of fluid infiltration.
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                Author and article information

                Journal
                REGEEP
                Reviews of Geophysics
                Rev. Geophys.
                American Geophysical Union (AGU)
                8755-1209
                1991
                1991
                : 29
                : 3
                : 279
                Article
                10.1029/91RG00969
                © 1991

                http://doi.wiley.com/10.1002/tdm_license_1.1

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                Self URI (article page): http://doi.wiley.com/10.1029/91RG00969

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