Isotopic and sedimentological clues to productivity change in Late Riphean Sea: A case study from two intracratonic basins of India |
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| Authors: | P P Chakraborty A Sarkar S K Bhattacharya P Sanyal |
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| Institution: | (1) Department of Applied Geology, Indian School of Mines, 826 004 Dhanbad, India;(2) Department of Geology and Geophysics, Indian Institute of Technology, 721 302 Kharagpur, India;(3) Physical Research Laboratory, 380 009 Ahmedabad, India |
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| Abstract: | Enriched13C/12C ratios with δ13C ∼3%0 (w.r.t PDB) of two Late Riphean (∼ 700-610 Ma) intracratonic carbonate successions viz., Bhander Limestone of Vindhyan
Basin and Raipur Limestone of Chattisgarh Basin suggest higher organic productivity during this period. This view is supported
by sedimentological evidence of higher biohermal growth and consequent increase in depositional relief in the low gradient
ramp settings inferred for these basins. Oxygen isotope analysis of these carbonates show distinct segregation between enriched
deeper water carbonate mudstone and depleted shallow water stromatolite facies that received fresh water influx. This shows
that facies-specific analyses can be useful in understanding the depositional setting of these sediments. |
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| Keywords: | δ 13C Late Riphean intracratonic organic productivity |
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