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=== Mid-ocean ridges === [[Mid-ocean ridges]] are where new [[oceanic crust]] is formed as tectonic plates move apart. Hydrothermal metamorphism is extensive here. This is characterized by metasomatism by hot fluids circulating through the rock. This produces metamorphic rock of the greenschist facies. The metamorphic rock, [[serpentinite]], is particularly characteristic of these settings, and represents chemical transformation of olivine and pyroxene in ultramafic rock to [[serpentine group]] minerals.{{sfn|Kearey|Klepeis|Vine|2009|pp=28-29, 129-131}}{{Sfn|Yardley|1989|p=12}}
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