Abstract
Occurences of stable vesuvianite-epidote paragenesis within greenschist facies of metamorphism are described. It is suggested that this paragenesis gives way to grossularite-diopside (plus vesuvianiteor epidote) assemblage in the almandine-amphibolite facies. This interpretation conforms best to the results of petrographic observations and also satisfies the topological requirements of the CaO-(Mg, Fe2+, Mn)O-(Al, Fe3+)2O3-SiO2H2O-CO2 system, to which these assemblages belong. Contrary to the ideas in vogue, it is suggested that vesuvianite can very well originate within the greenschist facies, whereas the appearence of grossularite and diopside (consequent on which vesuvianite and epidote becomesmutually incompatible) ushers the almandine-amphibolite facies in.
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