Thus far, we have emphasised the common features of crustal fluids by discussing them in general terms, but of course the specific fluid compositions and processes may be quite different in different geological settings. One of the main reasons that we are interested in fluids (other than hydrocarbons) is because of what they can do to rocks. Fluids can catalyse mineral reactions, such as the conversion of granulite to eclogite (Austrheim, 1987), change rock strength, focus deformation (Rutter, 1983; Cox, 2010), and change the chemical composition of rocks by adding and removing material in solution,...

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