Thermally induced transformation of magnetic minerals in soil based on rock magnetic study and Mössbauer analysis

Jeleńska, Maria; Hasso-Agopsowicz, Agata; Kopcewicz, B.

doi:10.1016/j.pepi.2009.11.004

Cited by 34 publications

(17 citation statements)

References 30 publications

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“…However, the contribution of hematite cannot be ruled out (Banerjee, 1971;Lowrie and Heller, 1982;Freeman, 1986;Sarris et al, 2009). 4) Abrupt changes in the magnetic susceptibilities (see, e.g., samples 88 and 143 in Figures 5 and 6, respectively) during the heating and cooling procedure suggest mineral transformations (Jeleńska et al, 2010).…”

Section: Resultsmentioning

confidence: 99%

Magnetic properties of soils in a designated Natura area (GR4310010, Giouchtas Mountain)

Kokinou

2015

Interpretation

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The magnetic behavior of the geologic formations around the Giouchtas or Juchtas Mountain (Mt.) in Central Crete, Greece, has been studied. The magnetic parameters (magnetic susceptibility [MS] and temperature dependence of the magnetic susceptibility) of 160 surface soil samples were interpreted based on available information (e.g., topographic, geologic, and historical) for the area of study. The soil samples have been collected from the low-and high-elevation regions of Giouchtas Mt. The low-elevation region, surrounding a northsouth asymmetric ridge (strongly affected by the tectonic activity), is mainly covered by Miocene and recent sediments, whereas the high-elevation region is dominated by limestones. Differences in the spatial distribution of the MS and the thermomagnetic behavior of the soil samples indicated the strong influence of natural and anthropogenic factors on the geologic formations.

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Section: Resultsmentioning

confidence: 99%

Magnetic properties of soils in a designated Natura area (GR4310010, Giouchtas Mountain)

Kokinou

2015

Interpretation

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“…For example, Jelenska et al (2010) showed that heating up to 200400C resulted in the transformation of hydroxides such as goethite, lepidocrocite and ferrihydrite to magnetite/maghemite. However, their thermomagnetic curves do not exclude that this transformation could start at a lower temperature, around 100C.…”

Section: Discussionmentioning

confidence: 99%

Strongly magnetic soil developed on a non-magnetic rock basement: A case study from NW Bulgaria

et al. 2011

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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.K e y w o r d s : magnetic susceptibility,

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“…Results of the Mössbauer spectroscopy measurements at room temperature are in good agreement with the magnetization measurements showing a lack of any magnetic splitting in the spectra of samples from Limanowa, Wola Batorska, and Szczurowa (they could be successfully fitted with just two doublet components). Hyperfine interaction parameters point toward a presence of silicates and clay minerals [24][25][26] as well as an important contribution from β-FeOOH. The rest of the samples require two doublet and one or two sextet components in order to fit the spectra in a satisfactory manner.…”

Section: Magnetic Properties Of Soil Samples and Mӧssbauer Spectroscopymentioning

confidence: 99%

“…Not less importantly, 57 Fe Mössbauer spectroscopy measurements both at room temperatures and (for selected samples) at liquid Helium temperatures, give detailed information on the oxidation state of Fe in the compound, as well as on the local ordering of the material. With respect to that, Mössbauer hyperfine parameters are a kind of fingerprint allowing a precise determination of the sample composition [22][23][24][25][26]. Combining magnetization data with these obtained from spectroscopic measurements gives a perfect opportunity to clearly distinguish particles coming from different anthropogenic sources.…”

Section: Introductionmentioning

confidence: 99%

Airborne Magnetic Technoparticles in Soils as a Record of Anthropocene

et al. 2019

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Airborne magnetic particles in soils were studied in sites located in various distances to industrial plants. Chemical and mineral composition of soil samples were analysed. The highest values of the Pollution Load Index (PLI) calculated for several elements were noted for sites relatively distant from industrial plants. Soil samples exposed for the deposition of airborne particles were examined by means of magnetization versus an external applied magnetic field as well as 57 Fe Mössbauer spectroscopy measurements showing a lack of correlation of the magnetic properties with total Fe content, which points toward a strong impact of the industrial activities. Magnetic fraction was extracted and studied using scanning electron microscopy with energy dispersive spectrometry. Two types of spherical particles were noted. Massive ones occurring in all sites and particles with a complex internal structure more abundant in sites situated closer to industrial plants. The presence of spherical magnetic particles formed in high temperature processes indicate their relatively long range transport in the atmosphere. Broad distribution, characteristic and easy for identification spherical form of these magnetic technoparticles, suggest that one can consider them as a record of the Anthropocene. Accumulation of such technoparticles is related to rapid industrialization in the post-World War II period.

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Thermally induced transformation of magnetic minerals in soil based on rock magnetic study and Mössbauer analysis

Cited by 34 publications

References 30 publications

Magnetic properties of soils in a designated Natura area (GR4310010, Giouchtas Mountain)

Magnetic properties of soils in a designated Natura area (GR4310010, Giouchtas Mountain)

Strongly magnetic soil developed on a non-magnetic rock basement: A case study from NW Bulgaria

Airborne Magnetic Technoparticles in Soils as a Record of Anthropocene

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