Viscous magnetization of loess/palaeosol samples from Bulgaria

The processes of acquisition of viscous remanence and its decay in zero magnetic field are studied for three sets of palaeosol and loess samples. A linear behaviour of VRM vs. log t minus is obtained for 10–104 min. to 30 days of acquisition experiments. Linear correlation between the obtained coeff...

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Bibliographic Details
Published in:Earth, planets, and space planets, and space, 2001-01, Vol.53 (3), p.169-180
Main Authors: JORDANOVA, Diana, YANCHEVA, Gergana, GIGOV, Valentin
Format: Article
Language:English
Subjects:
Core-shell structure
Decay
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geophysics: general, magnetic, electric and thermic methods and properties
Internal geophysics
Loess
Low temperature
Magnetic fields
Magnetic permeability
Magnetic saturation
Magnetization
Marine and continental quaternary
Oxidation
Remanence
Surficial geology
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Summary:The processes of acquisition of viscous remanence and its decay in zero magnetic field are studied for three sets of palaeosol and loess samples. A linear behaviour of VRM vs. log t minus is obtained for 10–104 min. to 30 days of acquisition experiments. Linear correlation between the obtained coefficients of viscous acquisition normalized to saturation magnetization (Sa/Js) or frequency dependent magnetic susceptibility (Sa/χfd%) and the ratio of susceptibility to saturation magnetization (χ/Js), suggests that ultra fine SP/SD grains are mainly involved in the process of viscous acquisition. Non-linear VRM vs. log t behaviour is observed during viscous decay in μ-metal shielded space, being most pronounced for the first 10 min. of the experiment. It is supposed that this phenomena is due to the presence of composite grains (core/shell structure), formed as a result of low-temperature oxidation. The latter increases towards older palaeosol units.
ISSN:1343-8832
1880-5981
1880-5981
DOI:10.1186/BF03352374