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AF demagnetization characteristics and isothermal remanent magnetization (IRM) acquisition of a variety of rocks are analysed in the form of Cisowski plots and plots of progressive demagnetization of natural remanent magnetization (NRM) and anhysteretic remanent magnetization (ARM) against IRMs. The igneous rocks studied carrying a primary NRM acquired during initial cooling have a ratio of NRM:IRMs...
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