CHEMOSTRATIGRAPHY OF CARBONATE SUCCESSION OF THE VEMPALLE FORMATION, CUDDAPAH BASIN, INDIA: A STRATIGRAPHIC RECORD OF TERMINAL PALAEOPROTEROZOIC OCEAN-ATMOSPHERE-BIOSPHERE SYSTEM - Carpathian Journal of Earth And Environmental Sciences

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Gopal CHAKRABARTI¹, Debasish SHOME², Subhasish KUMAR², John S. ARMSTRONG-ALTRIN³ & Alcides N. SIAL⁴
¹Education Directorate, Govt. of West Bengal, India, Kolkata-700091, India, e-mail: gl_chak@yahoo.co.in
² Jadavpur University, Departament of Geological Sciences, Kolkata-700032
³Instituto de Ciencias del Mar y Limnología, Unidad Académica Procesos Oceánicos y Costeros, Universidad Nacional Autónoma de México, Circuito Exterior s/n, 04510, Mexico D.F., Mexico, e-mail: john_arms@yahoo.com
⁴ Universidade Federal de Pernambuco, Departmento de Geologia, Nucleo de Estudos Geoquímicos e Laboratório de Isótopos Estáveis (NEG - LABISE), Caixa Posta 7852, 50670-000 Recife, PE, Brazil.

CHEMOSTRATIGRAPHY OF CARBONATE SUCCESSION OF THE VEMPALLE FORMATION, CUDDAPAH BASIN, INDIA: A STRATIGRAPHIC RECORD OF TERMINAL PALAEOPROTEROZOIC OCEAN-ATMOSPHERE-BIOSPHERE SYSTEM

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A shallowing-upward succession of intertidal to subtidal stromatolitic dolomites of the upper Palaeoproterozoic (Orosirian) Vempalle Formation of Cuddapah basin, Peninsular India, is preserved in the Bramhanapalle area (14°25´15" N, 78°12´19" E), near Pulivendla, south India. The δ¹³C_carb and δ¹⁸O_V-PDB values of some selected stromatolitic dolomite samples from this succession vary from +1.25 to -5.74 per mil and from -5.42 to -18.25, respectively. These values are consistent with the global data during the upper Palaeoproterozoic time. A positive to negative δ¹³C shift in the studied stratigraphic section is indicating (i) a gradual decrease in the biomass productivity during the deposition of Vempalle sediments (ii) the decline of stromatolite type carbonate rocks due to the volcanic activity during the deposition of the Vempalle sediments (iii) an advent of “snowball earth” - like condition in the Indian Peninsular region at the onset of Vempalle sedimentation.