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| Titel |
Assessment of Rock Magnetic Parameters for Fly Ash Pollution Screening in Topsoil of the Deccan Trap Basalt Area, India |
| VerfasserIn |
U. Blaha, N. Basavaiah, P. K. Das, K. Deenadayalan |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250061341
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| Zusammenfassung |
| Rock magnetic parameters of highly magnetic topsoil of the Deccan Trap basalt area are
evaluated for their suitability for efficient environmental magnetic pollution screening.
Parameters, such as magnetic susceptibility (Ï), frequency dependence of magnetic
susceptibility (κ fd%), anhysteretic remanent magnetization (ARM), saturation isothermal
remanent magnetization (SIRM), soft isothermal remanent magnetization (Soft IRM), as well
as thermo-magnetic analysis (κ-T) are compared and assessed for best depiction
of topsoil contamination due to ash deposition around the Nashik thermal power
station (NTPS). Fifty-five topsoil samples, collected along north-south and west-east
stretching transects of 24 km length, are the basis for evaluation of the specific ash
distribution pattern around the plant and its adjacent ash pond. Similar decline of the
magnetic signals with increasing distance from the point source is observed in the
concentration dependent magnetic parameters and can be modeled. The magnetic
grain size parameters instead reveal increasing trends with increasing distance.
Verwey-transition and Hopkinson peak obtained from κ-T analyses demonstrate to be
important parameters to prove fly ash accumulation in soils of basaltic origin. The
importance of magnetic parameters for indirect tracing of pollutants, such as heavy
metals, is shown by Pb, Zn and Cu data, revealing similar distribution pattern as
obtained from the concentration dependent magnetic parameters. Confirmation of the
presence of a very high amount of ash particles in the vicinity of the NTPS and a
low number of particles in more distant areas is provided by scanning electron
microscopy (SEM) on quantitatively extracted magnetic particles at 5.5 km and 11.9
km distance in eastern direction. The investigation demonstrates that the majority
of the rock magnetic parameters has the potential to be successfully applied in
environmental magnetic studies in areas with high magnetic background values. |
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