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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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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creator JORDANOVA, Diana
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GIGOV, Valentin
description 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.
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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
title Viscous magnetization of loess/palaeosol samples from Bulgaria
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