Carbon isotope fluctuations through the neoproterozoic-lower Cambrian Birmania basin, Rajasthan, India

• Autores: Anil Maheshwari, Alcides N. Sial, S.C. Mathur
• Localización: Carbonates and Evaporites, ISSN 0891-2556, Vol. 17, Nº. 1, 2002, págs. 53-59
• Idioma: inglés
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• Resumen

  • The results of a carbon isotope study from a hitherto unexplored marine sediments from the Birmania basin, Northwestern India are reported, which documents significant isotope variation across the Precambrian-Cambrian boundary (Pc/C). An attempt has been made to identify carbon isotope chronostratigraphic marker for the Precambrian-Cambrian boundary in the sedimentay succession. The transition is marked by a negative excursion during phosphoritic activity at the base of the Birmania succession which is followed by a positive excursion close to the boundary and a swing back to less positive values in the Early Cambrian. The characteristics of the paleoenvironment during the transition interval is also discussed.