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Mazumdar, Dipanjan
- Nature of Flow Patterns of Rajahmundry Lava, Gowripatnam Area, West Godavari, India:Insights from AMS Studies
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Authors
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1 Department of Geological Sciences, Jadavpur University, Kolkata 700 032, IN
1 Department of Geological Sciences, Jadavpur University, Kolkata 700 032, IN
Source
Current Science, Vol 113, No 09 (2017), Pagination: 1719-1728Abstract
Anisotropy of magnetic susceptibility (AMS) data for a single basaltic lava flow, herein named the Gowripatnam lava flow from the Rajahmundry Traps, are evaluated for determining precisely the mechanism of lava flow. At Rajahmundry, lava flows are found on both banks of the Godavari River and sandwich intertrappean sedimentary layers in between. The ones on the west bank of the river are studied here. This study has an implication as the mechanism of lava flow or nature of lava flow patterns of Rajamundry Trap basalt is still a debatable issue. AMS directions is a powerful tool for investigating the source and direction of lava. Its application to single lava flow from Rajahmundry indicates maximum direction of susceptibility axes in almost all possible directions, indicating radial flowage from radial vent source(s). Two AMS directions (towards north-west – 14%, and north – 7%), however, have the maximum number of petals. This indicates that at least there were palaeo-flowage patterns towards these directions. Incidentally the Godavari lineament strikes NW–SE and the flow dip is due south. However, the two dominant magnetic lineation directions are due north. Hence, the possibility of the earlier suggested river piracy model for lava flow can be ruled out. The fissure eruption near Rajahmundry is pointed out as the then prevailing lava flow mechanism. This is further supported by an overall random distribution of maximum susceptibility axes apart from two dominant flow directions.Keywords
Anisotropy of Magnetic Susceptibility, Long Distance Lava Flowage, Rajahmundry Traps, Fe–Ti Oxides.Full Text
References
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- Imprints of vehicular pollution in roadside dust from Kolkata, India: insights from magnetic susceptibility, geo-statistical and SEM studies
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Authors
Affiliations
1 Department of Geological Sciences, Jadavpur University, 188 Raja S.C. Mullick Road, Kolkata 700 032, India, IN
2 Department of Geological Sciences, Jadavpur University, 188 Raja S.C. Mullick Road, Kolkata 700 032, India; Department of Geology, Rajiv Gandhi University, Rono Hills, Papum Pare 791 112, India, IN
3 Department of Geological Sciences, Jadavpur University, 188 Raja S.C. Mullick Road, Kolkata 700 032, India, IN
4 Department of Geological Sciences, Jadavpur University, 188 Raja S.C. Mullick Road, Kolkata 700 032, India; Geology Department, Asutosh College, S.P. Mukherjee Road, Kolkata 700 026, India, IN
1 Department of Geological Sciences, Jadavpur University, 188 Raja S.C. Mullick Road, Kolkata 700 032, India, IN
2 Department of Geological Sciences, Jadavpur University, 188 Raja S.C. Mullick Road, Kolkata 700 032, India; Department of Geology, Rajiv Gandhi University, Rono Hills, Papum Pare 791 112, India, IN
3 Department of Geological Sciences, Jadavpur University, 188 Raja S.C. Mullick Road, Kolkata 700 032, India, IN
4 Department of Geological Sciences, Jadavpur University, 188 Raja S.C. Mullick Road, Kolkata 700 032, India; Geology Department, Asutosh College, S.P. Mukherjee Road, Kolkata 700 026, India, IN
Source
Current Science, Vol 124, No 1 (2023), Pagination: 56-62Abstract
The present study aimed to determine the magnetic susceptibility of roadside dust collected from different parts of Kolkata city, West Bengal, India. The average value of susceptibility was 4.96 ´ 10–6 m3/kg, the highest being 19.6 ´ 10–6 m3/kg and the lowest being 1.2 ´ 10–6 m3/kg. The frequency-dependent susceptibility value (average = 2.19) indicated the dominance of stable-single domain grains with a low concentration of superparamagnetic grains at a few locations. SEM analysis showed morphological diversity of road dust – irregular, aggregate, angular and cloudy. Energy dispersive X-ray spectroscopy analysis of the dust particles revealed that Ca-rich, Na-rich and Fe-rich particles were abundant. Compositions were variable with the morphology. The mapping of magnetic susceptibility indicated that the susceptibility values were higher in areas with heavy vehicular traffic and other polluting sources. However, some areas with high pollution had open spaces, indicating the dispersion of magnetic pollutants. The study indicated the degradation of the environment due to anthropogenic activitiesFull Text
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