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Textural features combined with mineral chemistry preserved in metamorphic rocks provide in­sights into metamorphic reaction mechanisms as well as open vs. closed system processes. Prograde tourmaline-rich muscovite pseudomorphs after staurolite develop in sillimanite zone metapelites adjacent to peraluminous granitoid intrusives in NW Maine. Tounnalines occur in discrete domains restricted to central regions of muscovite-rich, quartz-poor pseudomorphs with biotite-rich margins. These tourmaline grains are relatively large (≤ 1.0 nun), lack detrital cores and exhibit only minor compositional zoning, in sharp contrast to matrix tourmaline from other samples. These features suggest fluid-infiltration as the causative mechanism for the fonnation of these tounnaline-rich mica pseudomorphs after staurolite.

Tourmaline-rich pseudomorphs in sillimanite zone metapelites: Demarcation of an infiltration front