Partially molten rocks cover a wide span; in the book here under review, melt ranges from 0.0X to 60 per cent by volume! In nature, therefore, partially molten rocks encompass a lot: ultramafic diapirs at depths of hundreds of kilometers, igneous intrusions of all stripes, regional migmatites developed in continental crust mostly between 60 and 10 km beneath the surface and at shallower depths in some contact aureoles, “wet” salt domes, and even glacial ice.

Study of partially molten rocks in geological systems is one of the fastest growing fields of research in petrology today. Recognition that only small proportions...

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