Archean greenstone belts and Proterozoic granulite mobile belts are products of fundamentally different tectonic processes that culminated in different levels of crustal incision. The present study focuses on graphite-bearing fluid inclusions from two such terrains in India, the Angul domain of Eastern Ghats Mobile Belt and Hutti-Maski schist belt of the eastern Dharwar greenstone-granite belt. In both cases, a high population of such inclusions within the fluid inclusion assemblage rules out the possibility of graphite being a captive phase, and instead confirms that it was deposited by the fluid within the inclusion cavity. Graphite is usually observed to be occurring with either pure water or a pure carbonic ( CO2 only) liquid, or with a CH4 dominated carbonic liquid without vapor at room temperature. Graphite precipitation in inclusions is brought about by reaction of the CO2 and CH4 trapped as a homogeneous fluid to give rise to H2O and C (graphite). Molar volume calculations for the CO2-CH4 mixture assuming an appropriate PVTX relationship indicates that there is a substantial increase in volume with decreasing pressure at a given temperature. The reaction producing graphite and H2O from CH4 and CO2 involves substantial volume reduction, and hence would be favored when the rock undergoes rapid exhumation. Graphite-bearing inclusions in quartz in a late-stage leucosome from migmatites in the Angul domain of the EGMB are accompanied by other fluid inclusion evidence for isothermal decompression. In the Hutti-Maski schist belt of the eastern Dharwar Craton, graphite-bearing inclusions occur in structurally controlled quartz veins (often auriferous ) within metamorphosed mafic volcanics (schists and amphibolites). The Raman spectra indicate that graphites in fluid inclusions from the Hutti-Maski schist belt have both ordered (O) and the disordered (D) peaks, whereas those from the Angul area of EGMB lack the disordered (D) peaks, process. However, the Hutti-Maski schist belt experienced a lower amount of uplift than the Angul domain, where the driving mechanism led to a deeper level of incision. This difference in the extent and rate of exhumation is speculated to be related to a fundamental difference in the nature of tectonism. A more detailed comparative study of the fluid inclusion characteristics would possibly throw more light on the changing tectonic style from the Archean to the Proterozoic, a topic that is extensively debated.