Do the large carbon isotopic excursions in terrestrial organic matter across Paleocene-Eocene boundary in India indicate intensification of tropical precipitation?
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Title |
Do the large carbon isotopic excursions in terrestrial organic matter across Paleocene-Eocene boundary in India indicate intensification of tropical precipitation?
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Creator |
SAMANTA, A
BERA, MK GHOSH, R BERA, S FILLEY, T PANDE, K RATHORE, SS RAI, J SARKAR, A |
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Subject |
Tropical terrestrial Paleocene-Eocene Thermal
Maximum Eocene hyperthermals Carbon isotope excursion Hydrological cycle PALAEOCENE/EOCENE THERMAL MAXIMUM OCEANIC METHANE HYDRATE NEW-ZEALAND DEEP-SEA N-ALKANES MARINE STRATIGRAPHY SEDIMENTS RECORDS CLIMATE |
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Description |
Five distinct transient warming (hyperthermal) events (Paleocene-Eocene Thermal Maximum [PETM], H1/ETM2/ELMO, H2, I1, and I2), marked by negative carbon isotope excursions (CIEs) occurred between Late Paleocene and Early Eocene (similar to 56 to 52 Ma) interval. However, not many records of either the PETM or definitive Early Eocene Hyperthermals (EEHs) are yet available from terrestrial realm in the tropics except two neo-tropical sections of Colombia and Venezuela (Jaramillo et al., 2010). Therefore, response of the tropical biosphere to these warming events is not very well known. Here we report high resolution carbon isotope (delta C-13) chemostratigraphy, biomarker, calcareous nannofossils, and pollen data from the Cambay shale Formation of Western India (paleolatitude similar to 5 degrees S), which show complete preservation of all the above CIE events including the PETM, hitherto unknown from tropical terrestrial record. Comparatively larger magnitudes of CIEs for all the hyperthermal events (the PETM and EEHs) point towards a possible intensification of precipitation during the PETM and all the early Eocene hyperthermal/CIE events. This inference is supported by data of lignin phenols and presence of tropical rain forest elements spanning the entire time period similar to 56-52 Ma and suggest that higher organic burial and soil erosion favored deposition of thick lignitic seams as a consequence of high tropical precipitation. (C) 2013 Elsevier B.V. All rights reserved.
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Publisher |
ELSEVIER SCIENCE BV
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Date |
2014-10-15T10:34:37Z
2014-10-15T10:34:37Z 2013 |
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Type |
Article
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Identifier |
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 38791-103
0031-0182 1872-616X http://dx.doi.org/10.1016/j.palaeo.2013.07.008 http://dspace.library.iitb.ac.in/jspui/handle/100/14758 |
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Language |
en
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