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dC Variations in Late Jurassic Carbonates, Jaisalmer Formation, Western India |
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| Authors: | Anil Maheshwari A.N. Sial S.C. Mathur R.P. Tripathi |
| Affiliation: | aDepartment of Geology, University of Rajasthan, Jaipur - 4, India bNEG-LABISE, Department of Geology, UFPE, Recife, Brazil cDepartment of Geology, J.N.V. University, Jodhpur, India dDepartment of Physics, University of Jodhpur, Jodhpur, India |
| Abstract: | The carbon isotope measurements, carried out on subsurface carbonate samples from Oxfordian Jaisalmer Formation, western India, yield positive d13C values up to +3.17%. The most positive Oxfordian C-isotope value corresponds to the carbon isotope excursion measured in samples from from other late Jurassic basins of world. The latest Oxfordian C-isotope values of Jaisalmer Basin fluctuate around 2% while the C-isotope values of 1.50% mark the base of Kimmeridgian. The Oxfordian C-isotope excursion appears to correspond to a time of overall increased organic carbon burial triggered by increased nutrient transfer from continents to oceans during a time of rising global sea level. |
| Keywords: | Carbon isotopes Oxfordian Jaisalmer Formation palaeoenvironment carbonates Ghotaru |
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