FLUID INCLUSION STUDY OF VINJAMURU PRECAMBRIAN STRATIFORM BARYTE DEPOSIT, NELLORE SCHIST BELT, AP, INDIA

The fluid inclusions in Vinjamuru baryte can be broadly classified into primary and pseudo-secondary types. Primary inclusions are represented by monophase carbonic and mixed carbonic-aqueous types. CO2 densities lie in the range of 0.78-0.88 g/cm3. The pseudo-secondary inclusions are represented by aqueous bi-phase type, coexisting with vapor-rich inclusions. Their Th overlaps in the range of 220-230-degrees-C, suggestive of entrapment from boiling fluids. The primary carbonic inclusions appear to be volcanic entrapments and the fluids in pseudo-secondary inclusions were entrapped from hydrothermal solutions.