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Authigenic δ13C-carb Negative Excursion in the Late Ediacaran–Early Cambrian Bilara Group, Marwar Supergroup, India

  • Research Articles
  • Published:
Journal of the Geological Society of India

Abstract

Late Ediacaran-early Cambrian sedimentary rocks from different palaeogeographical locations have recorded heterogeneous extreme negative carbon isotope excursions, which is commonly interpreted as a major event in the concurrent global carbon cycling. To understand the inorganic and organic carbon sourcing and type of the depositional environment that led to the negative δ13C-carb excursion, this study has re-assessed the high resolution inorganic and organic isotopes (δ13C-carb, δ18O-carb, and δ13C-org) and total organic carbon (TOC) data from the late Ediacaran-early Cambrian carbonate section of the Bilara Group, Marwar Supergroup, India. Statistical correlation analysis among δ13C-carb, δ18O-carb, δ13C-org and TOC data suggest that the Bilara carbonates were mainly deposited in a closed/semiclosed oligotrophic palaeobasin that was intermittently connected to the open ocean during eustatic sea-level rise. Steered by the water-level/volume fluctuations in the Bilara palaeobasin, the epicenter of carbonate precipitation shifted between the surface water column and sediment-water interface/sedimentary column. The negative δ13C-carb excursion was a result of increased authigenic carbonate precipitation, fuelled by anaerobic oxidation of organic matter at the sediment-water interface/in the sedimentary column during the high water-level/volume in the Bilara palaeobasin.

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Acknowledgements

We are thankful to Director BSIP and Dr. Mukund Sharma for their support. We appreciate the help of Dr. Shailesh Agrawal (BSIP) in facilitating the stable isotope analysis work. This MS is a BSIP contribution, BSIP/RDCC/Publication no 19/2019–20 and was funded by BSIP and DST (SR/FTP/ES-107/2014).

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  1. Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow, 226 007, India

    A. H. Ansari & S. K. Pandey

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Ansari, A.H., Pandey, S.K. Authigenic δ13C-carb Negative Excursion in the Late Ediacaran–Early Cambrian Bilara Group, Marwar Supergroup, India. J Geol Soc India 97, 615–624 (2021). https://doi.org/10.1007/s12594-021-1736-9

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  • DOI: https://doi.org/10.1007/s12594-021-1736-9

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