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Some new aspects for the modelling of isothermal remanent magnetization acquisition curves by cumulative log Gaussian functions
Author(s) -
Stockhausen Hagen
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/98gl01580
Subject(s) - remanence , coercivity , magnetite , hematite , rock magnetism , saturation (graph theory) , isothermal process , mineralogy , magnetization , gaussian , natural remanent magnetization , materials science , magnetic field , geology , condensed matter physics , chemistry , physics , thermodynamics , mathematics , metallurgy , computational chemistry , quantum mechanics , combinatorics
Rock samples containing (ferri)magnetic minerals acquire an isothermal remanent magnetization (IRM) after exposure to a direct magnetic field. Measuring IRM( B ) allows to produce IRM acquisition curves which were modelled by cumulative log Gaussian (CLG) functions ( Robertson and France, 1994) to discriminate the different magnetic phases. An approach of how to find the best model has been added to this method. From the investigation of a magnetite sample it is inferred that with the method the remanence acquisition coercive force for each magnetic component in a sample can be deduced. The method allows to detect minute concentrations of magnetically hard material in a predominant magnetically soft sample and vice versa. It furthermore allows to extrapolate the IRM behaviour of samples that do not reach saturation IRM in the experiment. The study of a natural hematite renders it possible that even well‐defined hematite may be contaminated by (ferri)magnetic impurities biasing the remanence acquisition coercive force of the sample towards lower values.