Recrystallization of Mica in Crenulated Schists

Abstract

DR. RAST'S letter is best answered by using his own text¹ which proceeds as follows. “Thus the first stage of [annealing] recrystallization … is … the regeneration of mica with approximate … orientation of the micas involved in the flexure. This regeneration … involves a nucleation step. It is an elementary assumption that where flexure of first generation micas is most intense the second generation mica will nucleate more rapidly [than elsewhere]. Assuming … initial post-nucleation growth is [the] most rapid, it is likely that the points of maximum flexure will be the positions of maximum growth of phylloblastic minerals thus producing the phenomenon of metamorphic differentiation (Fig. 4b). …” (My square brackets and italics.)