Fluid Inclusions in Migmatites from Hunsur, Karnataka

Fluid inclusion studies in migmatites around Hunsur document the presence of a) CO₂-CH₄, CO₂ and CO₂-H₂O inclusions in paleosome, b) predominantly CO₂ inclusions in leucosome and c) CO₂ and low salinity aqueous inclusions in late pink granite.

Chronological studies of CO₂ inclusions in quartz grains from migmatites and their densities corresponding to Th maxima plus mineral P-T data for the regional metamorphism indicate that they are syn-migmatitic fluids. An internal origin of CO₂ inclusions during the process of migmatization is envisaged.