Abstract
Fluid inclusions in rock forming quartz and in quartz from veins and Alpine fissures from eclogites and glaucophane bearing rocks of the southern Grossvenediger area as well as from amphibolitized eclogites and calcareous mica schists from the Grossglockner area (Austria) have been studied by microthermometry. The oldest fluid inclusions in the eclogites contain only CO2 and are characterized by a very high density up to 1.15 g/cm3. From eclogite forming temperatures in the range of 500 to 550°C a trapping pressure of about 8 kb results for these inclusions. This pressure is in good agreement with that derived from the eclogite-forming mineral reactions. The amphibolites formed by retrogressive metamorphism from the eclogites show fluid inclusions containing H2O and CO2, the densities of the CO2 being much lower compared to those of the fluid inclusions from the unaltered eclogites.
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