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Shrivastava, J. P.
- Polycyclic aromatic hydrocarbon compound excursions and K/Pg transition in the late Cretaceous–early Palaeogene succession of the Um Sohryngkew river section, Meghalaya
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Authors
Affiliations
1 Department of Geology, University of Delhi, Delhi 110 007, IN
2 Plot No. 2, Nabaroon Co-Op. Housing Society, Santoshree Palli, Thakurpukur, Kolkata 700 063, IN
1 Department of Geology, University of Delhi, Delhi 110 007, IN
2 Plot No. 2, Nabaroon Co-Op. Housing Society, Santoshree Palli, Thakurpukur, Kolkata 700 063, IN
Source
Current Science, Vol 109, No 6 (2015), Pagination: 1140-1150Abstract
A combustion-derived polycyclic aromatic hydrocarbon (PAH) compounds based high-resolution stratigraphic records across the Cretaceous/Palaeogene boundary section of the Um Sohryngkew river section is presented in this paper. The yellowish brown, organic-rich, 1 to 2 mm thick, clay layer in biozone CF3 is marked by sudden increase in the high molecular weight fluoranthene, pyrene, chrysene, benzo(a) anthracene PAH compounds. These componds are similar to those associated with the well-known K/Pg boundary sections across the world. Besides these, high abundance of low molecular weight 3 ring anthracene and fluorine, and 4 ring PAH compounds is also noticed in this layer. Subordinate amount of low molecular weight 3-ring phenanthrene, 3-methylphenanthrene, 2-methylphenanthrene, 9-methylphenanthrene and 1-methylphenanthrene PAH compounds have also been found in the successive layer of biozone CF2. Occurrence of high molecular weight PAH compounds in the biozone CF3 (66.83–65.45 Ma age) imply global fire, induced by the heat supplied by Abor/ Deccan volcanic activity, possibly linked with the K/Pg boundary transition events as later initiated prior to the K/Pg boundary, however, the main episode of Deccan volcanic activity occurred ~300 ky earlier or at the K/Pg boundary itself. PAH compound anomalies in the biozone CF3 is well coinciding with the well documented Ce anomaly layer, but, preceded by planktonic foraminiferal break and PGE anomaly bearing layer in the biozone P0. It is inferred that the K/Pg boundary related global fire played significant role in the collapse of the ecosystem, causing sudden demise of organisms.Keywords
Organo-molecules, polycyclic aromatic hydrocarbon compounds, stratigraphic record, volcanic activity.Full Text
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- Long-Term Performance Assessment of Nuclear Waste and Natural Glasses in the Geological Repository: a Geochemical Modelling
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Authors
Affiliations
1 Department of Geology, University of Delhi, Delhi 110 007, IN
2 Nuclear Recycle Group, BARC, Mumbai 400 008, IN
1 Department of Geology, University of Delhi, Delhi 110 007, IN
2 Nuclear Recycle Group, BARC, Mumbai 400 008, IN
Source
Current Science, Vol 110, No 2 (2016), Pagination: 214-219Abstract
Nuclear waste loaded and natural (analogue) glasses were studied to understand neo-formed mineral species, formed in equilibrium with the physico-chemical conditions existing in the geological repository. To predict alteration-phases, dissolution equations for average vitrification system (AVS), barium borosilicate (BBS) and obsidian glass were calculated, considering glass composition, pressure, temperature and pH conditions. Progress of reaction plotted against saturation index, indicates saturation with solid phases - chamosite, chalcedony and Ca-beidellite in obsidian; greenalite and fayalite in AVS; and coffinite BBS glass. Activities and molalities of aqueous species together with the number of moles of each mineral species produced and degenerated during the progress of the reaction (as a function of time) are discussed in this communication.Keywords
Geochemical Modelling, Geological Repository, Natural Glass, Nuclear Waste.Full Text
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