Limits of out-of-phase susceptibility in magnetic granulometry of rocks and soils
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Frequency-dependent magnetic susceptibility enables the amount of newly created ultrafine superparamagnetic particles to be assessed, being therefore important tool for environmental and palaeoclimatologic research. It was shown recently that the out-of-phase susceptibility is also able to provide this information. In the present paper we investigate the accuracy of the measurement of the out-of-phase susceptibility at all three frequencies of the MFK1-FA Kappabridge as well as accuracy in the determination of the XON parameter, which is the microscopic equivalent of the XFN parameter characterizing the frequency-dependent susceptibility. The method is tested on samples of cave sediments, a loess/palaeosoil sequence, and artificial specimens. The detection limit in determining the XON parameter is about 3%, which is only slightly worse than the reproducibility of the XFN parameter (about 1%). A new measuring technique is proposed making the accuracy in determination of the XON parameter comparable to that in determining XFN parameter. The main advantage of the out-of-phase susceptibility is that it is measured simultaneously with the in-phase susceptibility during one measuring process. This is very useful in working with large specimen collections as in palaeoclimatology and environmental magnetism.
Keywordsout-of-phase susceptibility frequency-dependent susceptibility measurement accuracy environmetal magnetism loess soil paleoclimatic reconstruction
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