Fluids1 in subduction zones have been a subject of growing interest for at least the last 20 years. Subduction zones are the major places on Earth for mass transfer, element recycling and chemical differentiation through magmatic processes in which fluids released from the slab play a central role. Hydrous subduction zone magmas are essential in the formation of numerous types of hydrothermal ore deposits and are the driving force behind magmatic-hydrothermal and geothermal systems in volcanic arcs. It is widely recognized that the characteristic geochemical signature of arc magmas results from the metasomatism of the magma source by a...

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