Article ID Journal Published Year Pages File Type
8912617 Precambrian Research 2018 64 Pages PDF
Abstract
Results of a 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.
Related Topics
Physical Sciences and Engineering Earth and Planetary Sciences Geochemistry and Petrology
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