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- Title
Geochemical signatures of Mesoproterozoic siliciclastic rocks of the Kaimur Group of the Vindhyan Supergroup, Central India.
- Authors
Mishra, Meenal; Sen, Shinjana
- Abstract
The Upper Kaimur Group of the Vindhyan Supergroup in Central India, primarily consists of three rock types-DhandraulSandstone, Scarp Sandstone and Bijaigarh Shale. Mineralogically and geochemically, they are quartz arenite, sublitharenite to litharenite and litharenite to shale in composition, respectively. The A-CN-K ternary plot and CIA and ICV values suggest that the similar source rocks suffered severe chemical weathering, under a hot-humid climate in an acidic environment with higher PCO2, which facilitated high sediment influx in the absence of land plants. Various geochemical discriminants, elemental ratios like K2O/Na2O, Al2O3/TiO2, SiO2/MgO, La/Sc, Th/Sc, Th/Cr, GdN/YbN and pronounced negative Eu anomalies indicate the rocks to be of post-Archean Proterozoic granitic source, with a minor contribution of granodioritic input, in a passive margin setting. The sediments of the Upper Kaimur Group were probably deposited in the interglacial period in between the Paleoproterozoic and Neoproterozoic glacial epochs.
- Subjects
INDIA; ROCKS; GEOCHEMISTRY; GROUPS (Stratigraphy); SHALE; SANDSTONE
- Publication
Chinese Journal of Geochemistry, 2010, Vol 29, Issue 1, p21
- ISSN
1000-9426
- Publication type
Article
- DOI
10.1007/s11631-010-0021-1