Carbon and Oxygen Isotopic Signatures in Albian-Danian Limestones of Cauvery Basin, Southeastern India |
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| Authors: | J Madhavaraju I Kolosov D Buhlak JS Armstrong-Altrin S Ramasamy SP Mohan |
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| Institution: | aDepartment of Geology, School of Earth and Atmospheric Sciences, University of Madras, Guindy Campus, Chennai - 600 025, India;bInstitute of Geological Sciences, National Academy of Sciences of Belarus, Kuprevich Street 7, 220141 Minsk, Republic of Belarus;cCentro de Investigación en Energía, Universidad Nacional Autónoma de México (UNAM), Priv. Xochicalco s/n, Col. Centro, Apartado Postal 34, Temixco, Morelos 62580, México |
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| Abstract: | The Albian-Danian limestones of Cauvery Basin show a wide range of d13C and d18O values (–13.2 to +1.1% and –9.0 to –2.5%, respectively). The cement samples show negative carbon and oxygen isotope values (–18.9 to –3.9% and –9.0 to –4.3%, respectively). The petrographic study reveals the presence of algae, molluscs, bryozoans, foraminifers and ostracods as major framework constituents. The limestones have microspar and equant sparry calcite cements. The pore spaces and vugs are filled with sparry calcite cement. The bivariate plot of d13C and d18O suggests that most of the samples fall in the freshwater limestone and meteoric field, while few samples fall in the marine limestone and soil calcite fields. The presence of sparry calcite cement, together with negative carbon and oxygen isotope values, indicates that these limestones have undergone meteoric diagenesis. |
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| Keywords: | C- and O- isotopes limestone diagenesis Cauvery Basin southeastern India |
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