Abstract
This paper reviews textural and chemical aspects of chlorite in garnet-to-sillimanitegrade metapelites of the southwest Rangeley Quadrangle in Maine. Because of polymetamorphism, the textural aspects of the chlorite could lead to interpreting it as a nonequilibrium phase. However, systematic patterns of chlorite chemical composition relative to metamorphic grade, mineral assemblages, and sulfidation reactions indicate that it is in chemical equilibrium with the other minerals present. It is concluded that for petrogenetic consideration of metapelites that have been subjected to polymetamorphism, chemical evidence is the best guide for assessing approach to equilibrium by chlorite.
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