Abstract

Zoned wallrock alteration surrounds each phyllic vein. Three zones distinguished: (1) a nearest wallrock zone where the preexisting minerals (except quartz) are wholly transformed into muscovite; (2) an intermediate wallrock zone where the alteration intensity decreases (30% of the rock is replaced by white micas); and (3) a farthest wallrock zone where a small proportion of preexisting biotites and plagioclases recrystallizes (less than 10% of the primary minerals recrystallize).--Modified journal abstract.

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