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Banerjee, Sayandeep
- Overburden-Induced Flattening Structure in the Himalaya: Mechanism and Implication
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Authors
Affiliations
1 Department of Geology, University of Calcutta, Kolkata 700 019, IN
2 Department of Earth Sciences, Indian Institute of Technology Bombay, Mumbai 400 076, IN
1 Department of Geology, University of Calcutta, Kolkata 700 019, IN
2 Department of Earth Sciences, Indian Institute of Technology Bombay, Mumbai 400 076, IN
Source
Current Science, Vol 109, No 10 (2015), Pagination: 1814-1821Abstract
Small-scale structures in fold-thrust belt are mainly formed in response to the emplacement of thrust sheets. However, some small-scale structures may not be developed directly in response to the emplacement of thrust sheets, but might be genetically tied with the orogenic process. Metre- to centimetre-scale late-stage folds on foliation in phyllite with near-recumbent fold geometry are selectively developed with a specific spatial distribution, particularly in places where the foliation is steeply dipping, in the Ramgarh thrust sheet in the Darjiling-Sikkim Himalaya. The recumbent-fold structures appear to have been formed in response to overburden-induced vertical compressive deformation on steep dipping foliation, especially in the subvertical southern limb of the antiformal structure of the Lesser Himalayan Duplex in the Darjiling-Sikkim Himalaya. The role of gravity and overburden in the formation of these structures from worldwide orogenic belts may be considered to validate their genesis.Keywords
Orogeny, Overburden-Induced Flattening, Recumbent Fold, Thrust Sheet.Full Text
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- Magnetic susceptibility mapping of roadside pollution in the Banaras Hindu University campus, Varanasi, India
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PDF Views:78
Authors
Affiliations
1 Laboratory for Analysis of Magnetic and Petrofabric, Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi 221 005, India, IN
1 Laboratory for Analysis of Magnetic and Petrofabric, Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi 221 005, India, IN
Source
Current Science, Vol 121, No 8 (2021), Pagination: 1046-1055Abstract
Among the several methods to determine anthropogenic pollutants in the soil, magnetic susceptibility measurements have proven to be useful for rapid and effective diagnosis of magnetic particles and overall screening of pollution. Magnetic particles and other heavy metals accumulated in the topsoil as a result of roadside pollution, contribute to the bulk magnetic susceptibility (c). Thus, c values of the soil can be utilized as a proxy to delineate the zones of high and low roadside pollution in an area. In this study, magnetic susceptibility measurements of the topsoil have been carried out and a quantitative assessment of roadside pollution in the Banaras Hindu University (BHU) campus, Varanasi, India is presented. Based on the c values of 212 soil samples covering 1300 acres of the campus, zones of high and low roadside pollution are demarcated. The present study has not only deciphered the spatial variation of pollutants in the BHU campus, but has also characterized the magnetic phases responsible for the susceptibility signal on the roadsides inside the campus. The obtained results are crucial for environmental monitoring and prioritization of land use and other anthropogenic activities inside the BHU campus. The modus operandi adopted here would be beneficial for mapping areas exposed to different levels of pollution intensity, for tracing the pollution transport and can be effectively applied to various ecosystemsKeywords
Anthropogenic pollutants, environmental magnetism, magnetic susceptibility, roadside pollution, topsoilFull Text
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