Stable Isotopic Compositions of Carbonates from the Mesoproterozoic Delhi Supergroup,Northwestern India

Marine carbonate rocks from the Delhi Supergroup show little deviation in whole-rock δ¹³Ccarb values, which are generally around 0% PDB. This narrow range and almost constant δ¹³Ccarb values persist despite close sampling through long, geographically widespread sections. The data suggest that, in contrast to the Neoproterozoic, the global rate of organic carbon burial was probably constant during deposition of the Delhi Supergroup, and perhaps generally during the Mesoproterozoic, as was the redox state of the atmosphere and hydrosphere.