A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Chakraborty, Partha Pratim
- Facies Pattern and Depositional Motif in an Immature Trench-Slope Basin, Eocene Mithakhari Group, Middle Andaman, India
Authors
1 Geological Survey of India, Calcutta, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 53, No 3 (1999), Pagination: 271-284Abstract
Detailed facies analysis in Eocene Mithakhari Group reveals eight different lithofacies of wide ranging paleogeographic significance. These facies are i) disorganised matrix-supported conglomerate, ii) graded matrix-supported conglomerate, iii) graded pebbly sandstone, iv) massive and thick-bedded sandstone, v) plane laminated and cross-stratified sandstone, vi) interbedded sandstone and mudstone, vii) massive to faintly laminated shale and viii) interbedded shale and coal; which are grouped into-five different facies associations (FA). viz. Subaerial alluvial plain (FAl), Shallow water, wave dominated shelf (FA2), Delta slope (FA3), Prodelta slope (FA4) and Submarine fan (FA5).
Lying unconformably on oceanic basement (ophiolite slices?) these sediments constitute short truncated successions. Litholog measurement in three isolated sections viz. Kaushalyanagar. Sagwannala and Rangat-Nimbutala reveal widely varying facies succession pattern. Frequent facies change, predominance of massflow deposits, signatures of synsedimentary basinal disturbance and wide paleogeographic variation indicate sedimentation in small isolated basins in an immature trench-slope setting. Profusion of progradational depositional cycles and evidences of emergence in the studied sections provide indication of frontal accretion and tectonic shoaling in the filling history of these basins.
Keywords
Sedimentology, Depositional Environment, Accretion, Eocene, Middle Andaman.- Facies Development and Depositional Environment of the Mungra Sandstone, Kolhan Group, Eastern India
Authors
1 Department of Applied Geology, Indian School of Mines, Dhanbad - 826 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 6 (2005), Pagination: 753-757Abstract
Preliminary study through process-Related facies analysis in late Paleoproterozoic-Early Mesoproterozoic Mungra Sandstone Formation of Kolhan Group, the least studied stratigraphy in Singhbhum Geology, reveals two major facies types, viz, hummocky sandstone bodies (below fair weather wave base) and planar and crossstratified sandstones (above fair weather wave base). From contact relations between facies types and facies succession development, a lower shoreface environment is inferred. An E-WW paleoshoreline orientation is suggested for the Mungra Sandstone Sea.- Episodic Emergence of Offshore Shale and its Implication: Late Proterozoic Rewa Shale, Son Valley, Central India
Authors
1 Department of Applied Geology, Indian School of Mines, Dhanbad - 826 004, IN
2 Department of Geological Sciences, Jadavpur University, Kolkata - 700 032, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 66, No 6 (2005), Pagination: 699-712Abstract
Detailed facies analysis in late Proterozoic Rewa Shale reveals three physically distinctive facies that differ in their paleogeography. Between shoreface and outer shelf the facies types are distributed as (I) shale with thin siltstone/Fine sandstone interbeds of outer shelf, (II) shale interbedded with HCS bearing sheet sandstone of inner shelf within storm wave base and (III) sandstone interbedded with silty shale of distal shoreface paleogeography. High resolution facies succession analysis reveals three different orders of depositional cyclicity, the lowest of which may be correlated with third order depositional 'sequence'. Thin (av 3 5 cm) discrete levels of emergence with their invariable associations and sharp transitions from inner shelf to shoreface facies mark the subaerial discontinuities, which punctuate the apparently monotonous. Rewa Shale succession Far from the coastline on a siliciclastic ramp that lacks shelf slope break, these features, even though cryptic, can provide important clues for sea level falls in shale dominated successions.Keywords
Depositional Cyclicity Emergence, Sequence, Rewa Shale, Son Valley, Central India.- Soft-Sediment Deformation as Possible Clue for Sedimentation Rate: A Case Study from Oligocene Andaman Flysch Group, Andaman Islands, India
Authors
1 Department of Applied Geology, Indian School of Mines, Dhanbad - 826 004, IN
2 Geodata Division, Central Headquarters, Geological Survey of India, Kolkata - 700 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 61, No 4 (2003), Pagination: 411-418Abstract
Two sections of Oligocene Andaman Flysch fan that belong to two different facies associations viz inner fan and mid fan lobe are studied for their soft-sediment deformation (SSD) features Seismic origin is proposed for these features in view of their lateral persistency and stratigraphic selectivity Detailed field measurements of these turbidite sections at Corbyn's Cove, South Andaman (259 m thick) and Kahpur North Andaman (1397 m thick) recorded 28 and 18 nos of SSD layers respectively These layers were compared with historical earthquake records of last 86 years (I e 1914 to 2000) around the studied sections and quantitatively assessed for (l) long-term sedimentation rate and (n) estimation of environment-specific sedimentation rate, if any Active delta shedding from growing orogenic front of Himalayas is believed to be responsible for high sedimentation rate (217 m/lOOOyr at Cove and 58 m/lOOOyr at Kahpur) recorded from this fan system The observed difference in sedimentation rate between the two studied sections is interpreted to be paleogeography driven.Keywords
Soft-Sediment Deformation, Rate of Sedimentation, Palaeoseismology, Oligocene, Andaman Flysch Group, Andaman Islands.- PGE Distribution in Chromite Placers from Andaman Ophiolite and its Boninitic Parentage
Authors
1 Geological Survey of India, Opn: WB-SK-AN, ER, Geological Survey of India, 5th floor, North Building, Bhubignan Bhawan, DK-6 Block, Salt Lake, Kolkata - 700 091, IN
2 Geology Department, Indian School of Mines, Dhanbad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 62, No 6 (2003), Pagination: 671-679Abstract
Chromite placers occurring in Rutland coast of Andaman and Nicobar Islands, India, show PGE incidence. Serpentinised dunite containing thin stringers/lenses of chromite occurring adjacent to placer was possibly the source rock of the chromite placers. Chemical analysis of these chromite placers show PGE elements incidence in the range: Ru <10-56 ppb, Ir <10-12 ppb, Rh <10-14 ppb, Pd <10-136 ppb, Pt <10-28 ppb. Normalization of these PGE values against CI-chondrite indicates enrichment of Ir and Ru and depletion of Rh and Pt, a typical character of ophiolitic chromite. Except few Pd values, the PGE values depict highly fractionated PGE distribution pattern. High Nig-olivine (Fo92-90)and highly fractionated PGE pattern may suggest derivation of the source rock from boninitic melt. Ru-Ir-Os bearing sulphides or alloys were crystallised at early magmatic stage, Pt, Pd were remobilized during hydrothermal activity and concentrated in serpentine.Keywords
Chromite Placers, PGE Incidence, S-Undersaturation, Boninite, Rultand, Andamans.- An Analytical Report on Renewable Energy Production from Municipal Wastes in Bangladesh
Authors
1 Department of Mechanical Engineering, Chittagong University of Engineering and Technology, Chittagong-4349, BD
Source
International Journal of Engineering Research, Vol 5, No 12 (2016), Pagination: 939-942Abstract
Daily wastes could be a great source of renewable energy. In a densely populated country like Bangladesh, tones of wastes are produced daily, a considerable portion of which is organic in nature, and also biodegradable. Due to absence of adequate waste treatment plants in Bangladesh, the accumulation of these wastes represent a serious environmental hazard, especially when untreated wastes are dumped directly into water bodies. But if these wastes can be processed systematically, it is possible to generate renewable energy from those. Bangladesh is already going through a dire shortage of electricity and power and with most of its gas fields nearing exhaustion, the situation is likely to worsen in near future. Hence, a way of extracting power from municipal waste essentially provides Bangladesh with alternative fuel option as well as reduces its waste disposal problem. This paper represents the procedures of getting renewable energy from daily municipal wastes in a regulatory way: how the wastes are to be first sorted according to biodegradable/non-biodegradable nature, subsequent power extraction from the first and recycling of the latter portion. The paper also includes the likely hurdles that have to be overcome, possible outcomes and benefits too.Keywords
Renewable Energy, Bangladesh, Biodegradable, Electricity and Municipal Waste.- Redox Structure of Vindhyan Hydrosphere:Clues from Total Organic Carbon, Transition Metal (Mo, Cr) Concentrations and Stable Isotope (δ13 C) Chemistry
Authors
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.References
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- Effect of Some Heavy Metal (Zn, Cu, Pb) Pollutants and Microbial Load on the Edible Oyster (Saccostrea cucullata) in Sundarban, West Bengal
Authors
1 Department of Microbiology, Raja N. L. Khan Women’s College, Paschim Medinipur, Pin-721102, West Bengal, IN
2 Department of Microbiology, Vidyasagar University, Paschim Medinipur Pin-721102, West Bengal, IN
Source
Journal of Environment and Sociobiology, Vol 18, No 1 (2021), Pagination: 1-13Abstract
Total bacterial count (TBC), total coliform (TC), total faecal coliform (TFC), E. coli and Bifidobacterium sp. in the flesh of edible oyster (Saccostrea cucullata), in three collecting stations of Sundarban, varied during different seasons of a year. The bacterial load was maximum in monsoon and minimum in pre monsoon. Heavy metal content in the flesh showed following sequence: Zn>Cu>Pb, with maximum values during monsoon and minimum values during pre-monsoon. Further, maximum antioxidant enzyme (Catalase and Superoxide dismutase) activities in the oyster were recorded during pre-monsoon which decreased in monsoon, while the level of lipid peroxidation (free radical) was minimum in pre-monsoon. It appears, therefore, that the antioxidant activity in oyster was inversely proportional to the heavy metal concentration in the flesh. Hence, monitoring of heavy metal content in the water of Sundarban estuary is considered vital towards the survivability of the oysters.Keywords
Bacterial Load, Heavy Metals, Antioxidant Enzyme, Oyster, Sundarban.References
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- Carbonates from the Palaeoproterozoic Sleemanabad Formation, Mahakoshal Basin, Central India
Authors
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.References
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