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| Titel |
GEMAS: Unmixing magnetic properties of European agricultural soil |
| VerfasserIn |
Karl Fabian, Clemens Reimann, Dilyara Kuzina, Lina Kosareva, Leysan Fattakhova, Danis Nurgaliev |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250132031
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| Publikation (Nr.) |
 EGU/EGU2016-12495.pdf |
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| Zusammenfassung |
| High resolution magnetic measurements provide new methods for world-wide characterization
and monitoring of agricultural soil which is essential for quantifying geologic and human
impact on the critical zone environment and consequences of climatic change, for planning
economic and ecological land use, and for forensic applications. Hysteresis measurements of
all Ap samples from the GEMAS survey yield a comprehensive overview of mineral
magnetic properties in European agricultural soil on a continental scale. Low (460 Hz), and
high frequency (4600 Hz) magnetic susceptibility k were measured using a Bartington
MS2B sensor. Hysteresis properties were determined by a J-coercivity spectrometer, built at
the paleomagnetic laboratory of Kazan University, providing for each sample a modified
hysteresis loop, backfield curve, acquisition curve of isothermal remanent magnetization, and
a viscous IRM decay spectrum. Each measurement set is obtained in a single run from zero
field up to 1.5 T and back to -1.5 T. The resulting data are used to create the first
continental-scale maps of magnetic soil parameters. Because the GEMAS geochemical
atlas contains a comprehensive set of geochemical data for the same soil samples,
the new data can be used to map magnetic parameters in relation to chemical and
geological parameters. The data set also provides a unique opportunity to analyze the
magnetic mineral fraction of the soil samples by unmixing their IRM acquisition
curves. The endmember coefficients are interpreted by linear inversion for other
magnetic, physical and chemical properties which results in an unprecedented and
detailed view of the mineral magnetic composition of European agricultural soils. |
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