It is widely recognized that hydrous minerals are involved in a number of geochemical processes in the Earth’s mantle (Michael 1988; Thompson 1992; Schmidt and Poli 1998). Their presence affects the onset of melting (Lambert and Wyllie 1968; Mysen and Boettcher 1975) and can control the partitioning of trace elements during partial melting (Adam et al. 1993; Ionov and Hoffmann 1995; La Tourrette et al. 1995; Tiepolo et al. 2000). They have accordingly been implicated in the source regions of many types of magmas including alkaline basalts and highly-potassic...

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