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- Title
Oxygen and carbon isotope analysis of the Miocene limestone of Kerala and its implications to palaeoclimate and its depositional setting.
- Authors
Narayanan, V.; Anirudhan, S.; Grottoli, Andrea G.
- Abstract
The lower Miocene to Mio-Pliocene sedimentary basin of Kerala consists of Quilon carbonate sequence (Lower-Middle Miocene), which is confined between two clastic units (Ambalapuzha and Mayyanad formations). The carbonate sequence is not extensive but restricted between Alappuzha in the north and Edava (Thiruvananthapuram district) in the south. Stable isotopic analysis on Quilon limestone for δ18O points to a warmer Miocene climate, with an average value of 34.25°C. This value is slightly higher than the previously estimated temperature during the Miocene. The down core decrease of δ13C values of the limestone can be correlated with the transgressive phase during which carbonate get deposited in the Tertiary sequences of Kerala, as proposed by previous workers. Bivariate plots for δ18O and δ13C reveal that the limestone forms in the field of warm-water skeletons.
- Subjects
KERALA (India); INDIA; ISOTOPES; LIMESTONE; PLIOCENE paleoclimatology; SEDIMENTATION &; deposition; SEDIMENTARY basins
- Publication
Current Science (00113891), 2007, Vol 93, Issue 8, p1155
- ISSN
0011-3891
- Publication type
Article