Abstract
Textures resulting from the replacement of biotite by kyanite in biotite-rich schists of the polymetamorphic lower Basement Complex of the Luangwa Bridge area, Zambia, are described. This mode of kyanite growth, and several examples of Al2SiO5 growth by recrystallisation of cordierite, are used as a basis for a model of aluminium silicate accretion in rocks which have undergone polymetamorphism or polyphase metamorphism. Starting from the assumption that Al2SiO5 phase transformations are usually accomplished by a fluid intergranular phase it is suggested that aluminium concentration in the fluid, in addition to other factors, has a profound effect on the final assemblage of aluminium silicates.
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