Strongly magnetic soil developed on a non-magnetic rock basement: A case study from NW Bulgaria |
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| Authors: | Hana Grison Eduard Petrovský Neli Jordanova Ale? Kapi?ka |
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| Institution: | (1) Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China;(2) Department of Geophysics, China University of Geosciences, Wuhan, 430074, China;(3) Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China |
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| Abstract: | The enhanced magnetic susceptibility of modern soils is assumed to have several reasons including, e.g., weathering of an
iron-rich geological basement, natural fires, bacterial processes and atmospheric deposition of anthropogenic particles. We
report on a case where none of the above sources of magnetic enhancement is evident: a modern soil with high magnetic susceptibility
over the whole soil profile, developed on nonmagnetic limestones, in an area with no industrial activities. The surface magnetic
susceptibility varies from 60 to 110×10−5 SI, while that of the rock basement is nearly zero. Moreover, significant frequency-dependent magnetic susceptibility (>
12%) suggests that superparamagnetic secondary magnetite/maghemite plays an important role. Possible mechanisms, responsible
for this magnetic enhancement, are discussed. |
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