Assessing Magnetic Susceptibility Profiles of Topsoils under Different Occupations

Magnetic susceptibility measurements at low and high frequencies (χlf, χhf) were carried out on topsoil samples from reforested, cultivated, and pasture lands from a catchment located at the north of Morocco. The aims of this study were to investigate the impact of land use or human activity on χlf...

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Bibliographic Details
Published in:International journal of geophysics 2018-01, Vol.2018 (2018), p.1-8
Main Authors: Bouhsane, N., Bouhlassa, S.
Format: Article
Language:English
Subjects:
Allochthonous deposits
Bedrock
Catchment area
Cultivated lands
Ferrimagnetism
Human influences
Land use
Lithology
Magnetic permeability
Magnetic susceptibility
Magnetism
Mineralogy
Minerals
Occupations
Pasture
Precipitation
Profiles
Reforestation
Sediments
Soil
Soil pollution
Soil profiles
Soils
Substrates
Topsoil
Watersheds
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Summary:Magnetic susceptibility measurements at low and high frequencies (χlf, χhf) were carried out on topsoil samples from reforested, cultivated, and pasture lands from a catchment located at the north of Morocco. The aims of this study were to investigate the impact of land use or human activity on χlf of soil overlying the same substrate, to discriminate allochthonous material or pollution from autochthonous or inherited ones, and to assess the origin and contribution of superparamagnetic (SP) grains to the global magnetic susceptibility χlf. Measurements of χlf indicated significant enhancement, with values ranging from 12.4 to 252.82 × 10-8 m3 kg−1 with a mean value of 107.087 × 10-8 m3 kg−1 for the reforested lands. In the cultivated lands, χlf were from 8.4 to 88.65 × 10-8 m3 kg1 with a mean value of 42.69 × 10-8 m3 kg−1, while in the pasture lands, χlf was comprised between 14.34 × 10-8 m3 kg−1 and 133.35 × 10-8 m3 kg−1 with a mean value of 57.33 × 10-8 m3 kg−1. The magnetic enhancement indicates high concentration of ferrimagnetic minerals in the top soil. The magnetic susceptibility enhancement decreases as the human activity increases, while the underlying bedrock is almost the same: reforested land > pastures land > cultivated land. The analysis of the variations of χlf and frequency dependent susceptibilities (χfd and %χfd), along the profiles of soil, indicate a pedogenic origin of the topsoil magnetic susceptibility enhancement.
ISSN:1687-885X
1687-8868
DOI:10.1155/2018/9481405