Sur l'existence et la nature de l'apport chimique dans certaines series cristallophylliennes

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Abstract
Distinguishes seven groups of metamorphic rocks according to chemical composition, ranging from argillaceous schists to granites and granulites, and discusses the physicochemical factors involved in the transformation of the pre-existing rocks during metamorphism, with special reference to the addition of calc-alkaline material from deep-seated magmas, the behavior of component elements, and the migration of ions during alteration.