FLUID INCLUSIONS IN MIGMATITES FROM HUNSUR, KARNATAKA

Fluid inclusion studies in migmatites around Hunsur document the prese nce of a) CO2-CH4, CO2 and CO2-H2O inclusions in paleosome, b) predomi nantly CO2 inclusions in leucosome and c) CO2 and low salinity aqueous inclusions in late pink granite. Chronological studies of CO2 inclusi ons in quartz grains from migmatites and their densities corresponding to Th maxima plus mineral P-T data for the regional metamorphism indi cate that they are syn-migmatitic fluids. An internal origin of CO2 in clusions during the process of migmatization is envisaged.