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Chakraborty, Partha Pratim
- Redox Structure of Vindhyan Hydrosphere:Clues from Total Organic Carbon, Transition Metal (Mo, Cr) Concentrations and Stable Isotope (δ13 C) Chemistry
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Authors
Affiliations
1 Birbal Sahni Institute of Palaeosciences, Lucknow 226 007, IN
2 Department of Geology, University of Delhi, Delhi 110 007, IN
3 Department of Geological Sciences, Jadavpur University, Kolkata 700 032, IN
1 Birbal Sahni Institute of Palaeosciences, Lucknow 226 007, IN
2 Department of Geology, University of Delhi, Delhi 110 007, IN
3 Department of Geological Sciences, Jadavpur University, Kolkata 700 032, IN
Source
Current Science, Vol 115, No 7 (2018), Pagination: 1334-1341Abstract
Trace metal concentration in black shales can hold valuable information regarding ancient deep-ocean redox state. The size of marine reservoir of redoxsensitive elements (particularly molybdenum and chromium) is principally controlled by the extent of anoxicity in marine conditions following the onset of oxidative weathering post Great Oxygenation Event (~2.5-2.3 Ga). Hence, it is considered that coupled analysis involving redox-sensitive element/s and primary organic productivity (total organic carbon) may provide a clue for redox behaviour of ancient deep ocean. Here, we use the redox behaviour of Mo and total organic carbon values of Vindhyan shales to show that the Vindhyan hydrosphere although initiated as a stratified sea with anoxic and sulphidic deep water as exemplified by the geochemical character of the Arangi Shale, the extent and veracity of anoxicity and euxinicity was never pervasive. It further suggests that the Vindhyan hydrosphere developed euxinic deep water only during deposition of Arangi, Rampur and Bijaygarh black shale and was anoxic but certainly not euxinic during Koldaha and Rewa sedimentation. The low concentration of Mo and Cr, in general, in argillaceous intervals suggests that the Vindhyan Sea behaved as a moderate Mo and depleted Cr reservoir. The consistent low concentration of Cr within the Vindhyan shales also suggests restriction in the availability of Cr in the water column in the absence of any significant detrital supply of Cr at very low atmospheric oxygen level (<0.1% PAL; present atmospheric level).Keywords
Hydrosphere, Primary Organic Productivity, Total Organic Carbon, Transition Metals, Stable Isotope Chemistry.Full Text
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Authors
Affiliations
1 Department of Geology, University of Delhi, Delhi 110 007, IN
1 Department of Geology, University of Delhi, Delhi 110 007, IN
Source
Current Science, Vol 121, No 3 (2021), Pagination: 414-421Abstract
Facies and facies succession analysis from four sections in a ~12 m thick carbonate succession, hitherto undescribed, exposed over an east–west transect over 600 km from the topmost part of the Palaeoproterozoic Sleemanabad Formation, Mahakoshal Group, Central India reveals facies development in a proximal–distal relation. The facies types include microbialite and stromatolite, interbedded limestone–mudstone, intra-clastic conglomerate, pyrite bearing dark-coloured li-mestone and massive/normal-graded conglomerate and fine-grained sandstone. While microbialites and isolated stromatolites (rarely conjoined) with seafloor precipitate are interpreted as a product of proximal peritidal deposition, the dark-coloured pyrite bearing limestone represents the distal platform deposition below storm wave base.Keywords
Carbonate Succession, Facies Types, Mass Flow, Proximal-Distal Relation.Full Text
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- Provenance and burial history tracking from quartzite hosted detrital garnet grains Delhi Supergroup of rocks, Firozpur-Jhirka ridge, India
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Authors
Affiliations
1 Department of Geology, University of Delhi, Delhi 110 007, IN
2 Manav Rachna Centre for Adavance Water Technology and Management, Manav Rachna International Institute of Research and Studies, Faridabad 121 004, IN
1 Department of Geology, University of Delhi, Delhi 110 007, IN
2 Manav Rachna Centre for Adavance Water Technology and Management, Manav Rachna International Institute of Research and Studies, Faridabad 121 004, IN
Source
Current Science, Vol 127, No 12 (2024), Pagination: 1427-1433Abstract
Quartzites of the Delhi Supergroup, exposed along the Firozpur-Jhirka ridge in Faridabad, Gurgaon areas of Delhi-National Capital Area, host detrital garnet grains. The garnet grains are studied for understanding provenance and diagenetic history. Samples were collected from the Badkhal lake area, Faridabad. X-ray diffraction study identifies quartz, garnet, magnetite and goethite as major mineral phases. Whereas quartzites show recrystallization texture, garnet grains record intense fractures and magnetites form large acicular grains. From electron probe microanalysis garnet grains are identified as almandine with high spessartine content and a pegmatite source is suggested. From preserved in-situ exsolution of magnetite from garnet it is inferred that a temperature exceeding 550°C (>17 km burial depth) in the course of burial history and magnetites exsolved below 550°C from garnet during the uplift of quartzite.Keywords
Delhi supergroup, exsolution, garnet, pegmatite, quartzite.Full Text