Mechanism and geochemical implications of the Late Holocene organic carbon burial event: an example from the southwest coast of India |
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| Authors: | B Ajaykumar Mahesh Mohan M S Shylesh Chandran K K Jayasooryan K S Unni A P Thomas |
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| Institution: | 1.School of Environmental Sciences,Mahatma Gandhi University,Kottayam,India |
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| Abstract: | Carbonaceous clay found in the palaeo-deposits of Meenachil River basin was analysed for the total organic carbon, nitrogen
and textural characters. Radiocarbon dating of this clay formation and the embedded carbonized wood fragments was also done.
The values obtained for the organic carbon, nitrogen and C/N ratio of the carbonaceous clay exhibited a very remarkable range,
suggestive of different environmental conditions of formation. It is evident from the present study that since the lignin
and cellulose are the dominant components of terrestrial higher plants, allochthonous and submerged organic matter have high
C/N ratio. The radio carbon dating of the sediment and wood samples suggested that the palaeo-deposits of Meenachil River
basin were formed as result of many transgrassive–regressive episodes, which had started even before the formation of Vembanad
Lake. The formation of carbonaceous clay, as found sandwiched in palaeo-deposits, was due to the global eustatic sea-level
fluctuations and tectonism. |
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