Anisotropies of in-phase, out-of-phase, and frequency-dependent susceptibilities in three loess/palaeosol profiles in the Czech Republic, methodological implications

0479081 - GFÚ 2019 RIV CZ eng J - Journal Article
Hrouda, F. - Chadima, Martin - Ježek, J. - Kadlec, Jaroslav
Anisotropies of in-phase, out-of-phase, and frequency-dependent susceptibilities in three loess/palaeosol profiles in the Czech Republic, methodological implications.
Studia geophysica et geodaetica. Roč. 62, č. 2 (2018), s. 272-290. ISSN 0039-3169. E-ISSN 1573-1626
R&D Projects: GA AV ČR IAAX00130801
Institutional support: RVO:67985530 ; RVO:67985831
Keywords : anisotropy * out-of-phase susceptibility * frequency-dependent susceptibility
OECD category: Geology; Geology (GLU-S)
Impact factor: 1.293, year: 2018

The relationship between the anisotropy of frequency-dependent magnetic susceptibility (fdAMS) and the anisotropy of out-of-phase magnetic susceptibility (opAMS) was investigated theoretically and also empirically at three loess/palaoesol profiles in Prague and in Southern Moravia. The data treatment was made in terms of mean susceptibility, degree of AMS, and orientations of principal susceptibilities. It has shown that the fdAMS and opAMS can serve as indicators of the preferred orientations of ultrafine magnetic particles that are on transition between superparamagnetic and stable single domain states in rocks, soils and environmental materials. In loess/palaeosol sequences, the fdAMS and opAMS correlate reasonably, because they are due to magnetic particles of similar grain sizes. The fdAMS and opAMS can be both coaxial with standard AMS (i.e. anisotropy of in-phase susceptibility - ipAMS) or non-coaxial indicating slightly different orientations of viscous magnetic particles.
Permanent Link: http://hdl.handle.net/11104/0275162