As shown in Figure 4.1, the recipe for “granite ordinaire” is simple; all that is needed is a basaltic source, a generous dose of water, some “condiments” to add flavour, and a source of heat. But the simplicity of the recipe should not mislead – each ingredient is essential.

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It is now widely accepted that basalt is the dominant component in the source of high-volume granitic magmas (e.g.,Green and Ringwood, 1968; Barker and Arth, 1976; Kay and Mahlburg-Kay, 1991; Moyen and Martin, 2012). The material that melts may be solid, as in the...

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