Abstract:
The study analyzed the relationship between mineral magnetic properties and particle size in order to determine the suitability
of magnetic measurements to serve as particle size proxy for urban top soils samples collected from Jalingo, NE Nigeria.
Pearson correlation analyses between mineral magnetic parameters (χlf, χfd%, χARM, SIRM, Soft IRM, ARM/SIRM) and
particle size properties (PM2.5, PM10, clay, silt and sand) are reported. Results indicate that each particle size class shows
diferent strength of correlation with magnetic parameters, implying that each particle class contains a proportion of magnetic minerals. For the whole data set (n=154), χfd%, χARM and ARM/SIRM show signifcant positive correlation with
the fne size fractions (PM2.5, PM10, clay and silt) but negatively correlated with the sand proportion, while χlf, SIRM and
Soft IRM exhibit contrasting relationship. Of all the magnetic parameters, the magnetic parameters indicating fne-grained
ferrimagnetic minerals (ARM/SIRM and χARM) have the strongest and most signifcant correlations. The nature of the
magneto-particle size relationship is diferent when examined in terms of land use. The fact that magnetic properties and
textural parameters have strong relationship indicates that magnetic methods could be considered a potential particle size
proxy in Jalingo. However, since the relationship does not follow predictable and consistent patterns of other studies in top
soils and sedimentary settings, it brings to fore the non-universality of the method. Hence, the type of relationship existing
between magnetic and particle size properties in an environmental setting must be determined before applying the magnetic
method as particle size proxy.
