Precambrian Research
Precambrian Research
5 years ago

Carbon and oxygen isotope stratigraphy of the Ediacaran Bilara Group, Marwar Supergroup, India: Evidence for high amplitude carbon isotopic negative excursions

Results of robust high-resolution carbon and oxygen stable isotope studies conducted on the Ediacaran Bilara carbonate sequence of the Marwar Supergroup, Rajasthan, India are presented. The δ13C-carb and δ18O-carb in the Bilara Group vary from -9.0 to 4.1‰ and from -10.7 to 8.3‰ respectively. Overall, 457 analyzed samples have δ18O -carb significantly above -10‰, below which carbonates are considered diagenetically altered. The results are compared with well-dated established high amplitude negative carbon isotope excursions sites in other parts of the world recorded from the Ediacaran successions. The Bilara δ13C-carb pattern is closely similar to that of the Yangtze Gorges platform, South China, where the Ediacaran δ13C-carb variation profile revealed four negatives (EN1, EN2, EN3, EN4) and three positive excursions (EP1, EP2, EP3). Similarities of δ13C-carb pattern demonstrate that carbonate succession of the Bilara Group is likely time equivalent to Yangtze Gorges succession.

Publisher URL: www.sciencedirect.com/science

DOI: S0301926817301390

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