The behavior of hydrous phases at non-ambient conditions is an important topic in the Earth sciences because the water stored in their structures as OH or H2O can dramatically affect geological processes. For example, it is well known that the release of structural water during subduction is responsible for metasomatism and partial melting of the overlying mantle wedge, and associated volcanic activity at the surface. There is also a good correlation between the location of intermediate depth earthquake foci (~70–300 km) and the occurrence of hydrous minerals in subducted slabs. Many of the hydrous phases in subduction zones...

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