Serpentinization and metasomatism inthe subduction zone boundary

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There are huge diapiric seamount zones in the Mariana forearc area, west of Mariana Trench, western Pacific. Rock samples recovered from these seamounts were investigated to understand geologic phenomena along the deep plate boundary in the subduction zone. As the results, it is recognized that besides widespread serpentinization metasomatic reaction occurs between hydrous siliceous sediments and wedge mantle peridotites, and antigorite serpentinization produced Fe-rich fluids that affect the primary olivine composition to produce Fe-rich olivine around primary one.