Colour-coded Compositional Mapping of Orthopyroxene-Plagioclase Symplectites in Mafic Granulites from Panrimalai, South India

Abstract: Orthopyroxene-plagioclase symplectites have been observed in garnet-bearing mafic granulites from Panrimalai, South India. Symplectites are arrested textures from which one can study diffusional processes. We have used colour-coded compositional mapping for reaction textures from mafic granulites to understand the element mobility pattern. The variable.composition of anorthite in plagioclase supports the interpretation that the orthopyroxene-plagioclase symplectites adjoining embayed garnet blast were formed by open-system diffusion-controlled reaction in the NCFMAS model system.