Numerous observations provide strong evidence that fluid-fluid coexistence is a widespread phenomenon in many geological processes: i) Oceanic hydrothermal fluids display a wide range in salinity, which clearly indicates fluid phase separation of the circulating seawater (see Foustoukos and Seyfried 2007a); ii) Selective enrichment of certain elements and coeval entrapped inclusions of different, co-existing fluids highlight the role immiscible fluids play in ore formation (see Heinrich 2007a); iii) Trace element and stable isotope characteristic as well as equilibrium mineral assemblages in contact aureoles prove immiscible fluids to be a ubiquitous feature in most contact metamorphism (see Heinrich 2007b...

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