Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

B. Kumar ¹, S. Das Sharma ¹, M. Shukla ², M. Sharma ²

Affiliations
1 National Geophysicai Research Institute, Uppal Road, Hyderabad - 500 007, IN
2 Birbal Sahni Institute of Palaeobotany, Lucknow - 226 007, IN

Abstract

Carbon isotope records on carbonates from the Bhima basin are characterized by ¹³C enriched values (up to 4‰ PDB). These data are integrated with the available palaeontological records to suggest a Terminal Proterozoic (post - Varanger) age for the Bhima sediments. The carbon isotope compositions of Katamadevarhalli and Shahabad carbonates analysed in the present study exhibit two distinct trends. While the Katamadevarhalli carbonates show a positive trend, those from Shahabod display a negative trend from bottom to top, probably indicating long-term temporal trend of carbon isotope values.

Keywords

Chronostratigraphy, Carbonates, Carbon and Oxygen Isotopes, Bhima Basin, Terminal Proterozoic, Karnataka.

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