Abstract
The stable isotope systematics documented in the stratigraphically controlled sedimentary rocks represents the isotopic differences established in response to earth processes in the past. Relative enrichments and depletions of the oxygen (O) and carbon (C) ratios provide insights onto the paleoenvironmental conditions that existed during sediment deposition and diagenesis. Oxygen isotopes (18O/16O) in sediments have been used, mainly for the paleoclimatic reconstructions on regional and global scale, whereas the variations in the carbon isotopes (13C/12C) serve as a proxy for the amount of buried organic carbon, which in geological time under given conditions of sufficient thermal exposure and overburden, leads to the development of hydrocarbon source beds. Marked increase in carbonate carbon (Ccarb) and organic carbon (Corg) budget during Proterozoic and Mesozoic time periods is well known to coincide with the development of enormous and prolific Infracambrian and Mesozoic petroleum systems around the globe.
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